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Home / Product Category / AMPLIFIER / Commercial 70V Amplifiers / OSD PA90 70V Commercial Amplifier 60W 3x Microphone 3x Source Inputs

OSD PA90 70V Commercial Amplifier 60W 3x Microphone 3x Source Inputs

Product code: OSD-PA90

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Features & Specifications

The OSD Audio PA90 60-Watt Commercial 70-Volt Amplifier is the perfect control center for restaurants, meeting halls and other small commercial venues. It's versatile, powerful and affordable, and it features three XLR microphone inputs and three signal-level inputs. The MIC 1 Input has priority over the other inputs. When the MIC 1 Input signal is present, the PA90 will automatically mute other inputs and only MIC 1 Input is available to output. . It also has front-mounted gain control knobs for master bass and treble. The PA90 also has chime and alarm buttons, and it can be connected to CD players, TV outputs, smartphones and more.


Other Product Info

The PA-90 amp features three choices of output: 70volt, 100volt, or 8ohm output. It features three microphone input lines and three input line connections that can be connected to signal sources such as CD players, radios, MP3 players, etc. Each input line has an input volume control. The unit includes overload, over-heating and short-circuit protection.



  View Owner's Manual          


15 Questions & 15 Answers
from Philadelphia asked:
July 3, 2018
Can 2 of these amps be connected together two power two separate rooms from the same source ?
1 Answer
Hi Paul: Yes, you can connect two of these amp/mixers. My question is will they be located in their respective rooms or stacked in one location? If you plan on a central location you might want to consider our PAM245 which has three times the power and flexible 5 zone connections. You could easily add our MVC series 70V mono volume controls in the external room or in both. The PAM245 is a newer unit that features a simple remote as well. TL/5091
Submitted by: Tim Leahy on July 3, 2018

from Norwalk,CT asked:
November 3, 2017
So realisticly speaking, how many 70V speakers can this amp drive?
1 Answer
Hi Wojtek: The PA90 feature 60 Watts. So basically you need to calculate that 80 to 90% of the 60 Watts is available so think you have 48 to 54 watts to work with. Next you calculate the number of speakers you want to use. Typically like all the speakers we offer with 70V option there are five power levels available using a switch located somewhere on the speaker either the back or under the grill.. Take the OSD AP525T as an example. Optional 70-volt tap are: 32 watts, 16 watts, 8 watts and 4 watts. Simply put you calculate the number of speakers you are using and set the taps to equal less than the 48 to 54 watts you have to work with. So in this case you can have 6 speakers each set to 8 Watts for a total of 48 watts so that would work. Or as an example you could take 3 of the AP525T and set the taps to 16W or 48 watts total. Again you would be good to go. Now here is the cool thing, you do not have to set all the speakers at the same level. So you could set two speakers to 16W and two speakers to 8W, again a total of 48W. In this case the two speakers set to 8w would play half as loud as the two set to 16W. They can all be wired together as well. Another advantage to 70V is you can use smaller gauge wire and run longer lengths with virtually no loss. This is especially true if you are using a more expensive 70V amplifier that has a low frequency limiter. Not having to produce the lower frequencies as an example under 100Hz you could use 18 gauge wire over 350 feet and virtually have no loss.. I hope that answers your question. There is lot of information on setting up a 70V system on line so check it out. Don't just take my word for it. Good luck TL/4621
Submitted by: Customer Service - Q&A on November 11, 2017

from stlouis mo asked:
May 19, 2016
Does wire size make difference?
1 Answer
Hi Eddie: One pro for 70V versus 8 ohm is that size of the speaker cable does not matter for 70V like it does for 4/8 ohm. You can easily use smaller speaker wire for longer lengths, 16 or even 18 gauge. 16 gauge will give you up 720 feet at 50 Watts with no loss. There is a lot of good reference material on line that talks about gauge size for 70V. TL/3890
Submitted by: Customer Service - Q&A on May 20, 2016

from Garden Grove, CA asked:
March 21, 2016
I have a quick service restaurant and will be installing a microphone to this amplifier. When I use the microphone to call out a customer order will it automatically lower the volume of the music so that the customers can hear me calling out their name over the speakers?
1 Answer
Hi Ted: Yes the PA-90 when you have a microphone connected to MIC Input #1 will mute when you key up the mike. We also have two other PA amp/mixers depending on how many speakers you are planning to use. The PA90 is 60 watts, the PA150 is 120 watts and the PA270 is 240 watts. You will want to calculate how many speakers you are connecting to the amp mixer. You want to make sure the total of all the speakers does not exceed the output of the Amp/mixer you choose. Good luck TL/3772
Submitted by: Customer Service - Q&A on March 24, 2016

from Dallas, Texas asked:
March 30, 2015
So this amp has 60 watts output right? How many speakers can it run? I powered it on and it shut itself down. Am I running too many speakers on it? I have 10 speakers all set to 10 watts each.
1 Answer
Hi Jeff, Correct - the PA-90 outputs 60 watts. It sounds like the reason your amp is shutting off is because you're trying to pull more more than it has. 10 speakers at 10 watts each is 100 watts total. Try setting each speaker to 6 watts or below. If you happened to have blown the fuse already, there should be a spare fuse in the fuse compartment. If you need extra fuses, you can find them at practically any electronics store. Just make sure they're 250v fuses. Hope this helps!
Submitted by: Customer Service - Q&A on March 30, 2015

from Indianapolis asked:
March 23, 2015
I use three microphone for a on the floor meeting. Is there a way to keep all three microphone active without overriding either one? Thanks
1 Answer
HI Jamad: I believe the Mic 1 input automatically mutes all the other outputs including both mics 2&3 and the three other aux outputs when it is active. You may possibly add a PTT external device so it is only active when they push to talk and mute while it takes priority over the other outputs. This may not be as sophisticated as you need or want it to be. TL/3207
Submitted by: Customer Service - Q&A on March 26, 2015

ihsane oualaalou
from new york asked:
December 2, 2013
can i conect 4 outdoor spikers 200w each?
1 Answer
Hi Ihsane, The PA-90 has about 60watts total pushing out of it, meaning that each of your 4 speakers at most would be getting 15 watts each. I would recommend either the PA-150 or if you are not limited to a 70v system, run an AMP200. -BM 2370
Submitted by: Customer Service - Q&A on December 11, 2013

from Georgia asked:
November 7, 2013
Can the insert out jack be used as an input to another amp? I have a installation where the number of speakers (48) will require multiple amps. How do I make sure all both source inputs (background music - iPod and microphone paging) are heard on the outputs of all amps?
1 Answer
Hi Thomas, Excellent question! Yes, by removing the jumper on the insert in/out, you can preamp out into one or more amps to accommodate a large amount of speakers such as your application. Are you planning on running to another few PA90s and running 12 speakers on each set at 5watts per speaker? You could also run a PA270 off to get much more power. You will end up running the "insert out" of the last amp back to the "insert in" of the original amp. Let us know if you have any further questions. Thanks! -BM 2315
Submitted by: Customer Service - Q&A on November 8, 2013

from Vancouver asked:
October 18, 2013
Can 2 amps pickup a phone call made to the tel input at the same time? I only many to dial one number so both amps can answer and broadcast
1 Answer
HI Manny: I would check with your Telephone system manufacturer about splitting the signal to the two amplifiers. I pretty sure it can be done. It might depend on the effect of splitting the signal and whether it has enough current for two. You also need to check if your system has a three wire connection from the output. TS-2282
Submitted by: Customer Service - Q&A on October 18, 2013

from Lagos, Nigeria asked:
May 20, 2013
Hi, please what's the maximum amount of speakers I can connect to the PA 90. Want to use it for a school so from the principal office announcements can be made.
1 Answer
Hi Samson, If you were to use the PA-90 commercial amplifier for announcements, 10 Watts per speaker would be adequate. Therefore, you could put 6 speakers, tapped at 10 Watts each on the PA-90. CL/MA 1914
Submitted by: Customer Service - Q&A on May 29, 2013

from Houston, Texas asked:
May 4, 2013
Will this unit work with 8 speakers in a 1/3 mile run? They are 70 volt speakers in a large open parking area and the furtherest speaker is about 1/3 mile away.
1 Answer
Hi Dennis, The PA-90 commercial amplifier has 60 Watts to distribute to your 8 speakers. Each speaker could be set at 5 watts. The length is quite a distance but should be fine for this 70V system. This summer we are adding two more 70V amps to our product line rated at a higher power. If you can wait, that might be a better option. CL/MA 1861
Submitted by: Customer Service - Q&A on May 8, 2013

from Lagos, Lagos asked:
January 18, 2013
Can I get an MTR-250 70V/100V Amp Transformer 250 watts RMS to work with this amp if am looking at using 12 ceiling 70v speakers for a conference room paging system. And can the OSD PA-90 work with a Shure wireless microphone receiver with all the 12 speakers.
1 Answer
Hi Sunday, You do not need the MTR250 since it is a passive device used to convert a 250 watt 8 ohm amplifier to 70 Volt. The PA60 is a 60-watt integrated amplifier (with a choice of 70V, 100V or 8 ohm Mono) which should work for your application making sure to set the taps between 2.5W to 5W on each speaker. The Shure wireless microphone will work fine with the amplifier. The PA90 features three mic inputs. Mic one overrides the auxiliary input when activated. Mic two and three need to be selected as your source to work. The unit also features multi- voltage so it will work in Nigeria. TL/MA 1558
Submitted by: Customer Service - Q&A on January 20, 2013

from Galax, VA asked:
August 20, 2012
What kind of power will I need if I want to run 8-12 70V speakers off of this amp?
1 Answer
Hi Ben: This 70V Integrated Power Amplifier is rated at 60 watts so you would set your 70V taps at 5W per speaker for the 8 to 12 speakers. It really is a true 60 watts featuring 3 mic inputs and three additional inputs for a total of six inputs. TL 1246
Submitted by: Customer Service - Q&A on August 21, 2012

ahmad asad
from colton asked:
November 26, 2011
can i connect 10 150w 8" speekers to it and 2 subwoofers ?
1 Answer
We would not recommend connecting the 10 8 ohm speakers, especially rated at 150 watts. This is only a 60 Watt amplifier that works best in the 70V and 100V settings. In order to use 8 ohm speakers, you would need to purchase our 70V Commercial Transformer for each speaker and connect to the 5W (watt) setting. These are all stereo summed mono speakers wired in parallel. The transformers protect both the PA-90 and speakers. I do not believe you would be able to utilize the two subwoofers. The best choice for your application (sounds like you have all the speakers and subs already) would be to look at our OSD MX1260, 12 channel (60 watts per). This would give you the flexibility of driving all your speakers either in mono or a combination of stereo pairs plus it will have outputs for your two subwoofers. This amp provides maximum flexibility for any configuration and it is easy to setup. MA/TL
Submitted by: Customer Service - Q&A on November 28, 2011

ahmad asad
from colton asked:
November 26, 2011
where is the outpot in the pa-90 70v amp for the speekers
1 Answer
This has a simple terminal strip located on the back of the amplifier with output for 8 ohm, 70V or 100V. (note each or a summed mono output with a single positive output and a common ground). This is really a commercial amplifier/preamp that is ideal for running multiple 70V and 100V speakers. It will run a pair of 8 ohm speakers without transformers (from the 8 ohm connection) but could (based upon the tap from the transformers) run anywhere from 2 to 20 speakers (70V commercial speakers). MA/TL
Submitted by: Customer Service - Q&A on November 28, 2011

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