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Home / Product Category / Whole House Audio / Speaker Selectors / TSM-12 Dual Source 12-Zone Speaker Selector with Amplifier Protection Circuitry and A/B Switching

TSM-12 Dual Source 12-Zone Speaker Selector with Amplifier Protection Circuitry and A/B Switching

Product code: OSD-TSM12

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Features & Specifications

• Distributes audio from a high current amplifier to up to 12 pairs of speakers
• Provides high-quality signal transmission for use with either 4- or 8-ohm speakers
• Manually-activated power protection circuitry ensures amplifier stability
• Autoformer-based operates more efficiently than resistor-based selectors
• Includes front-panel A/B switch to drive speakers from either of two amps
• Play one pair, a combination of pairs, or all 12 pairs simultaneously
• Removeable snap-in connectors allow for easy installation
• Includes custom die-cut labels to identify each listening zone
• Compatible with all high-current amplifiers
• High quality construction
• Includes two-year warranty


Ideal for larger whole-house audio systems or commercial/retail spaces, the TSM-12 allows you to connect up to 12 pairs of speakers (12 listening zones) and simplify control with just a push of a button. Equipped with flexible switching options, this powerful and highly efficient dual source speaker selector lets you choose which zones to play via a front panel push-button controls, and the dual source (A/B) switching feature lets you switch between two source amplifiers. Designed for use with either 4- or 8-ohm speakers, connect the TSM-12 to a high current amp and in wall volume controls to create a sophisticated but simplified whole house audio experience.

Equipped with Impedance Protection

To help protect expensive audio equipment, this high-power speaker selector includes low-frequency protection circuitry that reduces subsonic signals so you can safely drive multiple pairs of speakers without going below an amp’s impedance ratings. Going below the impedance rating can overheat or even damage expensive equipment or cause the amplifier to automatically shut off.

Highly efficient, audio-grade impedance-matching autoformers safely distribute maximum power throughout your system, while a rotary switch located on the rear panel can be used to set the appropriate impedance to be seen by your amplifier based on the number of pair of speakers connected.

Designed for Ease of Use

You don’t have to be a technical wizard to install the TSM-12. This speaker distribution system accepts up to 14-gauge speaker wire and includes removable and easily identifiable 4-pole snap-in amplifier and speaker connectors for ease of installation. To simplify control of multiple listening zones even further, we include die-cut labels that can be attached to each button to identify each listening zone, for example, dining room, kitchen, patio, etc.

Specifications

Other Product Info

If you want a powerful speaker selector, the TSM-12 is a highly efficient dual source, impedance-matching speaker selector. It will handle more power and in cooler temperatures than the resister based speaker selectors. This high quality speaker selector is designed for use with either 4 or 8 ohm speakers. The A/B switch located on the front panel allows all your speakers to be driven from either of two amplifiers.

OWNER'S MANUAL

  View Owner's Manual          

QUESTIONS & ANSWERS

18 Questions & 20 Answers
pat
from canada asked:
May 29, 2012
What type of volume control would work best with this system. I have a harmon kardon receiver avr 300 to hook up to this system. Would this work ok?
1 Answers
Hi Pat, It depends if you are using the Harmon Kardon receiver for both home theater and multi-zone for whole house audio or using it to function as a two-channel stereo receiver. In the first example where you are using the receiver for home theater and whole-house, you will need to add an external amplifier like our OSD-AMP200 or AMP300 to connect from the HK AVR and provide the power to the TSM12. If you’re just powering the TSM12 for the whole House with the front speaker output of the receiver, you will not need an additional amplifier. Regarding volume controls, you could use either the SVC300 or VMS300 for inside and the OVC300 for outdoor zones. In all cases where you are using the TSM12 to provide the protection, select the right setting on the back of the unit (depending on the number of speakers connected to the TSM12). The volume controls would be set to 1/2x on the SVC300 and 2x on the VMS300. I hope that helps. TL
Customer Service - Q&A
on May 30, 2012

Brian
from Atlanta asked:
August 3, 2017
I have an Onkyo TX-NR656 7.2 for home theater system (new), additionally 4 pairs of in ceiling speakers spread in 4 rooms. 2 pairs of Bose outdoor speakers, and a bose sa5 as additional receiver. Would like to control all speakers and the two receivers. Need the TSM-12DS and what else?
1 Answers
HI Brian: It sounds like you have 4 zones in the house and 1 zone with 2 pair of speakers outside. What else did you have in your system; Speaker Selector, Volume Control? Do you also have an external amplifier connected to the Pre amp output of the ONKYO? I need a little more information before I can fully answer your question. I am familiar with the BOSE which operates like a SONOS Connect Amplifier. Let me know... tim@osdaudio.com TL/4503
Customer Service - Q&A
on August 4, 2017

Sumit
from New Jersey asked:
October 16, 2016
We just bought a house which has 8 speaker-pairs in various rooms, along with a volume controller in each room for that speaker-pair. So ideally we need a speaker selector which doesn't have its own volume controller, but I was wondering if this TSM-12 unit will work just as well. Also, we still have to purchase a receiver that can connect with TSM-12, has enough power output to handle all 8 speaker-pairs, and has flexibility to take different kind of inputs for music (for instance, can we wirelessly use our IPhone to play Pandora in 6 rooms and have the remaining 2 rooms play whats coming in the TV). Do you have any recommendations for such a receiver?
1 Answers
Hi New Jersey: First thing is to determine if your Volume Controls are impedance matching and if so what are the settings for each. It kind of depends on what the previous owner's system was. Did the previous owners leave any information on the system? Either way the TSM12 would not work for your application that you described, it is 12 zone versus the TSM8 which handles exactly the number of speakers. But both of these are dual source but only feature a master A or B switch where all zones are either A or B and not a combination of A and B. You would need to checkout our DSM8 which features independent A or B switches per zone which allows you to play different sources in multiple rooms. But this setup would need two amplifiers, one for Source A and the second for Source B. Note this would work as long as you confirm that your volume controls are all impedance Matching and set to either 4X or 8X. Then you could add a SONOS Wireless Connect as the front end of the first amplifier which would give you a source that could be easily connected and controlled by your tablet or smartphone. The second amplifier could be connected to your TV output. There are additional options I could explain further hut would need to know more about your system especially about the volume controls. Let me know at tim@osdaudio.com. Good luck TL4095
Customer Service - Q&A
on October 21, 2016

Jason
from Visalia, CA asked:
July 17, 2014
Well, two years later we are dealing with the same problem we had when we originally purchased this speaker selector. Scan down and you will see the message from Jason from Visalia, Ca on the posts on this website. Our left channel is not working again. Is there a way to fix this on my end or do I need to send the unit in again? I wasn't expecting it to go out again after last time. We use the system about once a month so it is definitely not from over use or abuse. Thank you for your time and assistance.
1 Answers
Hi Jason, From the looks of it, the reason you're running into this issue again is actually because of the receiver. Receivers aren't built to run multi-zone audio unless it's a single pair of speakers as your 2nd zone. 12 zones is far too many speakers to run off a single receiver. Not only will it not be supplying enough wattage through the two channels to accommodate 24 speakers, but the impedance load will be unstable for such a receiver to handle usually. I don't know if this was discussed with you in the past, but right away I noticed the receiver and automatically knew that is a potential issue. Typically our customers use our AMP300 when running anymore than 3-4 pairs of speakers off a single amp. The AMP300 not only has 300 total watts (150 per zone) but it is high-current so it can handle down to a 2ohm load. In my professional opinion, you need to upgrade your power. You can still utilize your receiver as the source of the music, but you need more power to run 24 speakers.
Customer Service - Q&A
on July 17, 2014

Matt
from McCall, Idaho asked:
November 9, 2013
Hello! I am outfitting the stereo system for our pub brewery, at a new location. The joint we are moving to, has 12 ceiling mount speakers 7 indoor, and 5 outdoor. This unit looks like a nice tool to simplify speaker control for the staff. We currently run a Denon AV surround receiver https://usa.denon.com/documentmaster/us/avr-687-om-e.pdf I have a hunch that it is under powered to run these all of these speakers. I would really appreciate some feedback on the TSM-12, and if it seems like a good fit for the application, and suggestions on the receiver/amplifier we would need. I am ready to purchase now the TSM-12 now. We have a new brewing facility being built in the spring, that will allow for 6 to 8 more speakers to be added to the system. Prost!!
1 Answers
Hi Matt, Thanks! The TSM12 will definitely make speaker selection more convenient, but your hunch is correct. The receiver you have is a home theater, surround sound receiver. These typically put out between 80-100 watts per channel but in surround sound. Some of them have a zone 2 that can run in stereo, but even then you are limited to how big of an ohm load it can handle. Generally receivers like yours can only run at 8ohms per zone. What you would need to run the TSM12 with sufficient power is the AMP300. This amp is high current and can handle that many speakers at once. Together, the AMP300 and the TSM12 make for a powerful and easy to operate audio system. Does that answer your question? Let us know if you have any follow up questions. Thanks! -BM 2326
Customer Service - Q&A
on November 11, 2013

David
from Songtan, South Korea asked:
April 3, 2013
I have two Sherwood RX-773 receivers (4 channel 100w per channel = total 400w) cascaded together to handle 16 JBL Control1 speakers (8ohm 100w RMS). I am trying to reclaim some space (this is set up in my wife's small bar) for another piece of equipment (a karoake console). I want to eliminate one of the Sherwood receivers, by wiring all sixteen speakers to the TSM-12 (I may add more speakers in the future). My question is: will there be a degradation in the sound volume or quality by removing one of the receivers, and wiring the speakers to the TSM-12 leaving just the one receiver in place? Thanks on advance for any assistance.
1 Answers
Hi David, If you are removing one receiver, you might lose power, especially if you are adding more speakers. We’ll need more information about your wiring. Please send a basic diagram to Casey@outdoorspeakerdepot.com with specifics. Include whether you plan to have the receiver wired in stereo to the TSM-12 speaker selector and any other relevant details. CL/MA 1763
Customer Service - Q&A
on April 5, 2013

Brett
from Omaha, NE asked:
March 3, 2013
I have a new dental office where I will have 6 single speakers and 1 pair of speakers(waiting room) with 7 volume controls. I was told a speaker selector was the best way to accomplish this by connecting all the vol controls to the selector and the selector to the receiver. Would this selector do that for me.
1 Answers
Hi Brett, The TSM12 would be a better choice if you were not using Volume controls since it has an excellent protection circuit. However, if you are planning to use impedance-matching volume controls, look at the DSM8 along with the SVC-205 Impedance matching with built-in on/off switches. Make sure to turn the protection switch off on the DSM8 instead allowing the volume controls to handle the protection (impedance matching). You would set each volume control to 8x. TL/MA 1672
Customer Service - Q&A
on March 3, 2013

FERMIN JAIMES
from CALIFORNIA asked:
July 20, 2012
I GET THIS ZONE SELECTOR BUT MY QUESTION IS HOW CONNECTED TO PIONEER RECEIVER VSX-819 H-K?
1 Answers
Hi Fermin: There is a Speaker B output on this Pioneer Receiver that will allow you to listen to a separate source. But driving 12 pair of speakers may be a lot to ask for the Room 2 Speaker (B) Level output . If you are looking to add a12 zone speaker selector we recommend adding a AMP200 or AMP300 to connect to the Multi-Room Pre-amp output on this receiver. The Pioneer will handle the source selection as well as control the master volume (from the dedicated remote). TL
Customer Service - Q&A
on July 23, 2012

Jason
from Visalia, CA asked:
May 29, 2012
Re: questions below. The TSM was set to the highest (8-12) for the pairs. The volume controls do not have any jumpers to set and they are not OSD as far as I know (they were there when we bought the house). Each zone has a single pair of speakers. I did not notice if the receiver got hotter than normal and there was no smell. I tested the outputs on the back of the receiver and both work. Thank you in advance! Dear Jason, Thanks so much for your interest in Outdoor Speaker Depot and in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. We have looked at the question you asked and we have an answer for you. Your question and our answer has also been published to our website where it can help other customers who are interested in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. Thanks for your contribution. Just as a reminder, you asked: Hi, My Sony Receiver is connected to my home theater speakers. My TSM-12 is connected to speakers throughout the home and outside on my patio. The Sony Receiver is connected to the TSM-12 through the extra L and R speaker output on the Sony Receiver. When I want to power any of the speakers throughout the home or outside I put the Sony Receiver into a 2 Channel mode which only generates output through the extra L and R speaker output (which is connected to the TSM-12). I select the speakers I want to use on the TSM (which has been just the outside speakers and living room so far). All of the speakers connected to the TSM-12 have separate volume controls in each of the corresponding rooms/areas. Like I said, this was working great until the last time I used it which was during a party. towards the end of the party it cut out and now only the output from the left side pair of the TSM-12 is working. Thanks. jason -------------------------------------------------------------------------------- To: jason_kimberly@hotmail.com Subject: Here is the answer to your question about TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection From: do-not-reply@outdoorspeakerdepot.com Date: Sun, 20 May 2012 04:03:22 -0500 Dear Jason, Thanks so much for your interest in Outdoor Speaker Depot and in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. We have looked at the question you asked and we have an answer for you. Your question and our answer has also been published to our website where it can help other customers who are interested in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. Thanks for your contribution. Just as a reminder, you asked: It appears that speaker output from the TSM-12 is only coming from the left side of the pairs. Both left and right had been working. Driving the TSM-12 is a Sony Receiver 7.1 100w x 7. I have only used this three times. thank you in advance. Here is our answer: Hi Jason: We need a little more information. Are you trying to power the TSM12 with a Internal Amplifier (either channel 6 and 7) or an External Amplifier like our AMP300 using the Pre-amplified audio outputs or the Receiver? Can you please try and describe your system in depth? Are you using Volume Controls or depending on the internal protection of the TSM12 to Impedance match the system? TL To buy the product now or to view more questions and answers about TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection just click here https://www.outdoorspeakerdepot.com/speaker-selector-transformer-dual-source-12-zone-with-amplifier-protection.html . We hope that you find our answer helpful. If you have any further questions, please do not hesitate to contact us at sales@outdoorspeakerdepot.com Peace, The Outdoor Speaker Depot Team Shop Outdoor Speaker Depot Now! Here is our answer: HI Jason: Just a couple of questions regarding your system. What was the protection switch located on the back on the TSM12 set to during this time. Were you using impedance matching volume controls and if so what were they set at? Are they OSD Audio's volume controls? Did you have single pair of speakers per zone? Did you notice if the speaker selector got hot or did your receiver get hot to the touch. Does the speaker selector smell funny like something had been burning? Did you test the outputs of your receiver (attaching a pair of speakers directly to your receiver) to make sure that both channels of the receiver were working? I can give you a better assessment if I know the answers to the above questions. TL To buy the product now or to view more questions and answers about TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection just click here https://www.outdoorspeakerdepot.com/speaker-selector-transformer-dual-source-12-zone-with-amplifier-protection.html . We hope that you find our answer helpful. If you have any further questions, please do not hesitate to contact us at sales@outdoorspeakerdepot.com Peace, The Outdoor Speaker Depot Team
1 Answers
Hi Jason: Please contact Brennan at OSD, brennan@osdaudio.com regarding returning the TSM12 so we can check it out. Do you have the ability to remove one of the volume controls and take a picture (send it Brennan) of it so I can confirm the type, Impedance matching or Resistor based. When did you buy the TSM12 and add it to the system? TL
Customer Service - Q&A
on May 30, 2012

Jason
from Visalia, CA asked:
May 29, 2012
Hi, My Sony Receiver is connected to my home theater speakers. My TSM-12 is connected to speakers throughout the home and outside on my patio. The Sony Receiver is connected to the TSM-12 through the extra L and R speaker output on the Sony Receiver. When I want to power any of the speakers throughout the home or outside I put the Sony Receiver into a 2 Channel mode which only generates output through the extra L and R speaker output (which is connected to the TSM-12). I select the speakers I want to use on the TSM (which has been just the outside speakers and living room so far). All of the speakers connected to the TSM-12 have separate volume controls in each of the corresponding rooms/areas. Like I said, this was working great until the last time I used it which was during a party. towards the end of the party it cut out and now only the output from the left side pair of the TSM-12 is working. Thanks. jason -------------------------------------------------------------------------------- To: jason_kimberly@hotmail.com Subject: Here is the answer to your question about TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection From: do-not-reply@outdoorspeakerdepot.com Date: Sun, 20 May 2012 04:03:22 -0500 Dear Jason, Thanks so much for your interest in Outdoor Speaker Depot and in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. We have looked at the question you asked and we have an answer for you. Your question and our answer has also been published to our website where it can help other customers who are interested in TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection. Thanks for your contribution. Just as a reminder, you asked: It appears that speaker output from the TSM-12 is only coming from the left side of the pairs. Both left and right had been working. Driving the TSM-12 is a Sony Receiver 7.1 100w x 7. I have only used this three times. thank you in advance. Here is our answer: Hi Jason: We need a little more information. Are you trying to power the TSM12 with a Internal Amplifier (either channel 6 and 7) or an External Amplifier like our AMP300 using the Pre-amplified audio outputs or the Receiver? Can you please try and describe your system in depth? Are you using Volume Controls or depending on the internal protection of the TSM12 to Impedance match the system? TL To buy the product now or to view more questions and answers about TSM-12 Dual Source 12 Zone Speaker Selector w/ Amplifier Protection just click here https://www.outdoorspeakerdepot.com/speaker-selector-transformer-dual-source-12-zone-with-amplifier-protection.html . We hope that you find our answer helpful. If you have any further questions, please do not hesitate to contact us at sales@outdoorspeakerdepot.com Peace, The Outdoor Speaker Depot Team Shop Outdoor Speaker Depot Now!
1 Answers
HI Jason: Just a couple of questions regarding your system. What was the protection switch located on the back on the TSM12 set to during this time. Were you using impedance matching volume controls and if so what were they set at? Are they OSD Audio's volume controls? Did you have single pair of speakers per zone? Did you notice if the speaker selector got hot or did your receiver get hot to the touch. Does the speaker selector smell funny like something had been burning? Did you test the outputs of your receiver (attaching a pair of speakers directly to your receiver) to make sure that both channels of the receiver were working? I can give you a better assessment if I know the answers to the above questions. TL
Customer Service - Q&A
on May 29, 2012

Jason
from Visalia, CA asked:
May 19, 2012
It appears that speaker output from the TSM-12 is only coming from the left side of the pairs. Both left and right had been working. Driving the TSM-12 is a Sony Receiver 7.1 100w x 7. I have only used this three times. thank you in advance.
1 Answers
Hi Jason: We need a little more information. Are you trying to power the TSM12 with a Internal Amplifier (either channel 6 and 7) or an External Amplifier like our AMP300 using the Pre-amplified audio outputs or the Receiver? Can you please try and describe your system in depth? Are you using Volume Controls or depending on the internal protection of the TSM12 to Impedance match the system? TL
Customer Service - Q&A
on May 20, 2012

Michael
from DC asked:
May 3, 2012
If the AMP is 16 ohm and the speakers are 8 ohm with a total of 12 pairs of speakers what would be the correct setting for the rotary switch. Also, each pair of speakers has a VMS100 set at the default impedance matching setting.
1 Answers
Hi Michael, We’ll need to know what amp/receiver you are using that is rated at 16 ohms. Technically, if you have a 16-ohm amp and 12 pairs of 8-ohm speakers, you need a 24x setting. You mentioned VMS100 Volume Controls set to default. It features four settings: 2x, 4x, 8x and 16x. Perhaps bypass the protection of the TSM12 (set it at 1) and set all the volume controls to 16x. Please let us verify the amp information, however, and whether you are connecting a volume control for each of the 12 zones. TL
Customer Service - Q&A
on May 4, 2012

Jason
from california asked:
April 27, 2012
Can you hook up a stereo/receiver (home theatre receiver) to the TSM-12 or do you need an amplifier as well?
1 Answers
Jason, To drive 12 pairs of speakers we would recommend adding a good high current amplifier like our AMP200 or AMP300. Usually the second zone output using the internal amplifier does not provide enough output. Most AV/Receivers feature a pre-amp output which allows you to add a good external amplifier to drive multiple speakers in conjunction with a speaker selector like the TSM12. CL
Customer Service - Q&A
on April 27, 2012

Brad Martin
from Gilbert, AZ asked:
April 27, 2012
Can you confirm the following configuration: Receiver amp source (rated 300 watts @ 8 ohms, 550 @ 4 ohms) channeled through the TSM-12 , then routed to 300 watt stereo in wall volume controls, and terminate to the ICE 840TT dual cone stereo speaker.
2 Answers
Brad, Those components all sound compatible. As long as the amp/ receiver is stable at 8ohms. CL
Customer Service - Q&A
on April 27, 2012
Hi Brad: Make sure the impedance setting on the Volume control is 1/2x for each pair of speakers you have connected through the volume controls. Then set the protection on the back of the TSM12 to the corresponding number of speakers connected to the speaker selector. Check the owners manual for use with 4 or 8 ohm loads. TL
Customer Service - Q&A
on May 1, 2012

Rodman
from Philly, PA asked:
March 19, 2012
How big or what kind of amp would I need for this to work well in my store?
1 Answers
Rodman, Our Amp300 could drive 12 zones, depending on their power handling of the speakers. CL
Customer Service - Q&A
on March 19, 2012

TD
from Dayton, OH asked:
March 15, 2012
I have 9 pairs of speakers in my house that all run into a single wire bundle with a lead going to a single 8ohm 100w amp, which keeps shutting off. I put all the impedance jumpers on the room sound controls to x8 and that sort of fixed the amp cutting out most of the time. I have another amp that is a 2x100w, 2ch stereo amp that i want to try, can install this speaker switch using both channels (A & B) from my other AMP to power the spkrs--meaning can i run 5 pair on Ch. A and 4 pair on Ch. B? Or does this switch only allow you to run all 9 pairs on EITHER Ch. A OR Ch. B? Thanks.
1 Answers
Hi TD: it would help to know what two amplifiers you actaully have already. Knowing the capabilities of each amplifier/receiver would help determine which would be best for the following. Thinking that one of the amps would work we would recommend purchasing a combination of our DSM6 and DSM4 speaker selectors. You mentioned having Impedance matching volume controls already. I would connect the DSM6 to Speaker A output and drive five pairs of speakers through a volume control for each pair. Then connect the DSM4 to speaker output B and drive the remaining four pairs again using Volume Controls. The first five pair would be set at 8X and the second four pair at 8X to be on the safe side. You can connect your second amplifer/reciever to both DSM as well. This time to the Source B input on each speaker selector. So you would connect Speaker A to Source B of the DSM6 and Speaker output B to Source B of the DSM4. Again depending on your Amplifier capabilities this would give you control over all 9 speakers while adding the capaility of having two sources to pick from for each speaker throughout the whole system.
Customer Service - Q&A
on March 15, 2012

Diego
from Brasil São Paulo asked:
March 9, 2012
Do you ship that to Brasil!? Do you accept International Visa Card? Thanks
2 Answers
Diego, We accept all major credits. We ship to Brazil and all over the world. We have a shipping calculator on the site. USPS priority International is the most economical. CL
Customer Service - Q&A
on March 9, 2012
Diego, We accept all major credits. We ship to Brazil and all over the world. We have a shipping calculator on the site. USPS priority International is the most economical. CL
Customer Service - Q&A
on March 9, 2012

eric
from tacoma wachington asked:
December 15, 2011
can you hook two tsm-12 dual source zones together
1 Answers
Hi Eric, We do not recommend you daisy chain these off of a single speaker output. The only exception is if you are using a high current amplifier like our AMP300: https://www.outdoorspeakerdepot.com/stereo-amplifer.html You would have to connect one TSM12 to Speaker A and the second TSM 12 to Speaker B. You must make sure you set the protection switch on the rear of the TSM 12 to the proper setting. This will not work using a second zone output from an Audio/Video Receiver or using a cheap 8-ohm power amplifier. Thank you for considering OSD Audio TL/MA
Customer Service - Q&A
on December 16, 2011

Product Reviews

4.0
1 Reviews
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100% Recommend this product (1 of 1 responses)
By Pete
Reno, Nevada
June 2, 2013
Very pleased with it's function and simplicity
This unit is very straight forward. You hook up the wires and the selector does the rest!