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    SKU: OSD-IWS-88

    OSD IWS88Dual 8" In Wall Subwoofer 350W, Injected Woofers Back Bridge Plate

    Purchase In Wall Subwoofer OSD IWS88 Dual 8" Injected Woofers Back Bridge Plate
    • Outdoor Speaker Depot SKU: OSD-IWS-88 dual-in-wall-passive-subwoofer-8-inch
    • In Stock


      Compare at: $161.99
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    We improved the lower end of our popular dual in-wall subwoofer. By adding a strong reinforced back plate to stiff the structure of the subwoofer, we make it to sound deeper and clean. A subwoofer is designed to reproduce the lowest of audible frequencies and will give you that spine-tingling rumble effect that takes you out of reality and into the plot. With dual 8" Injected polypropylene woofers, bigger magnets and 350 Watts of power handling, the IWS-88 in-wall subwoofer performs excellently for home theater surround sound applications as well as for listening to music. Like all OSD Audio speakers, the IWS-88 includes a dog-ear bracket system that mounts securely to the sheet-rock after the cut-out hole has been made and the speaker has been dropped into the hole. The grille is paintable to match your room decor and we even include a cutout template that doubles as a paint shield. You'll experience thunderous, room-filling bass without filling up floor space.

    Amplifier Suggestions
    Because this is a passive speaker, it will require a subwoofer amplifier to power it. An ideal match to this subwoofer is our OSD SMP500 dedicated subwoofer amplifier that features 400W RMS @ 4 ohms, Variable High Cut Filter 30Hz-150Hz; front panel Knob, and Choice of Signal Level Input or LFE (Low-Frequency Effects).

    Warning: California's Proposition 65


    This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to

    • Speaker Type: Dual 8" In-Wall Subwoofer
    • Woofer: Dual 8" Injected Polypropylene w/ Reinforced Back Plate
    • Frequency Response: 38Hz-500Hz
    • Power Handling: 350 Watts
    • Sensitivity: 90 dB @ 1W/1M
    • Impedance: 4 Ohms
    • Inputs: Spring Binding Posts
    • Install-friendly Dog Ear Installation Brackets
    • Cut-Out Template for Easy Installation
    • Paintable Grille Included
    • Sold As: Single
    • Mounting Depth (Assuming .5" Drywall): 3.56"
    • Unit Dimensions: (L x H x D) 11.43" x 18.43" x 4"
    • Cutout Dimensions: (L x H) 10.25" x 17.75"
    • Weight: 11 lbs
    • *Note: Requires Additional Subwoofer Amplifier
    • Warranty: 10 Years
    31 Questions asked
    Have a Questions?

    What's on your mind?

    Matt • 12/17/2019, 2:17:43 PM I want to put 2 of these in a 2 story 20ft by 20ft family room. I know that acoustics are not going to be that great in a 2 story room but wanted to know if this is overkill. Both subwoofers will be placed on the same wall - pic attached. Any help/advice greatly appreciated! Thanks!
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Matt: Two woofers are always better than one, there is a real reason AV receivers went to dual Subwoofer outputs as in 5.2 or 7.2. Even though Sub woofers are omni directional in nature versus the highly directional characteristics of the Tweeter with the High Frequencies. Due to wider Sign waves of the lower Frequencies when you use just a single sub woofer you will experience dead spots in your room. Adding a second sub woofer greatly negates this effect. So I would not call it overkill. Will you be able to build an enclosure or at least re enforce the area around the sub. It is also a good idea to use some fiber fill behind the sub so it thinks it is in a bigger enclosure. Our SMP250 Sub amplifier would be ideal for the job as well. Good luck TL/4592
    Nick • 12/17/2019, 2:17:43 PM Would this be safe to mount in the ceiling or is there a better product for that?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Nick: Yes these will work in a ceiling as will all of our in-wall subs but it is good idea to create some sort of enclosure to reinforce the speaker so it is not playing more bass above the ceiling. Stuffing the enclosure with fiber fill (like for Pillows) will help you tune your speaker. The fiber fill absorbs the low frequencies making the woofer think it is in a larger enclosure. Checkout our SL800 on-wall sub which features a quasi sealed enclosure with an 8 inch active woofer and 10" passive Woofer. It s too deep to fit into a wall but would fit between two ceiling joists and already features a tuned enclosure. Just a thought. Good luck TL/4609
    Evan • 12/17/2019, 2:17:43 PM What is the power output (RMS/max) for these speakers? Your website says 350W compared to the OSD website which states 240W.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Evan: 350 watts would be peak with 240 Watts RMS. Performance may vary depending on whether you design an enclosure for the Speaker. TL/4733
    Ford • 12/17/2019, 2:17:43 PM Is this unit suitable for damp locations? I would like to mount it on a covered porch.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Ford: Most in-wall open back subs and this one is no exception need to have some sort of reinforcement built around the speaker. It needs to be sealed with weatherproof silicon including all the seams of the box and also a bead of silicone should be applied on the inside of the frame so you seal around the cutout hole. It should be fine, Kentucky has humidity and temperature swings but no salt water or any of the extremes found in the deserts of Arizona or the Humidity of Florida during the summer. Note the enclosure size is not critical because of the infinite baffle design of the two drivers. There designed to adapt to almost any space you place them. It is also recommended using fiber fill to help tune the enclosure. The more fiber fill added the speaker will think it is in a bigger enclosure. Good luck TL/4750
    Patrick Skomer • 12/17/2019, 2:17:43 PM I just purchased the iws88 and the 250 watt amp for a new construction Ive got lot of room under the propane fireplace to build a sealed box or should I port the box into the room? I have enough room to build a box thats 2-7 cubic ft whats optimum?
    Customer Service • 12/17/2019, 2:17:43 PM
    HI Patrick: It might be worth while to build a ported box with the ability to block the port to do a comparison. Also many people using Fiber fill to help tune a box. You just want to line the inside walls actually gluing the poly fill. This was from Turbo Future: Which Is Better? A Sealed or Ported Subwoofer Design? There are quite a few different designs out there. If you're going DIY, you need to think about what you're going to build. In this guide I'm going to talk about the two main types, which are sealed and ported subwoofers. There are pros and cons to both types. There is a lot of information on this out there, so I'm not going to go too in depth with this or I'll be here for years. So, I will give a basic outline of the differences. Sealed This is a driver inside a sealed box. The drive unit is damped by the air inside the box. As sound gets to the limits of excursion, there is a lot of damping from the air, which means that you need a lot of power to drive it. If the enclosure has been made properly, then it will be airtight. Ported This type of subwoofer has a port which lets air in and out of the box freely as the drive unit moves back and forth. This will boost the output of the sub so it can play louder. The driver is not damped by air inside the enclosure, so less power is needed. Pros and Cons Now, there are pros and cons to both designs. A sealed subwoofer can be smaller than ported ones. The sound quality of a sealed sub is generally thought to be superior, although this is something that is debated, with people belonging to both camps. Since the driver is damped and the port doesn't boost the output, a lot more power and equalisation is needed to get the equivalent SPL levels of a ported sub. If you have a lot of power available, then its not necessarily a problem. But, this is something worth bearing in mind. When you're building a DIY sub, you can often find a way to accommodate either design. There is usually some space that can be utilized, in even the smallest room. TL/4809