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Focal Integration IBus 20

Compact 75-watt powered 8" subwoofer

Item #: 091IBUS20

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17 Reviews | 2 questions - 3 answers

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Thin and tough

Focal understands that it's not easy to get bass into every vehicle. They built the IBus 20 powered subwoofer to address this issue, so folks with bass-deficient systems in space-challenged vehicles could add some low-end punch. At just under 3" tall, this sub can fit under or behind many seats in the spaces usually reserved for stale bits of food. Focal built its chassis out of rigid aluminum, so it'll take a beating while it provides an incredibly stable home for the 8" sub.


This enclosure clocks in at less than 3 inches thick

Big bass in a tight space

You'll finally hear bass lines and percussion in your music, as the IBus 20's 8" sub combines with a built-in 75-watt RMS amplifier to deliver some impressive bass. This sub comes with line-level inputs that'll connect to an aftermarket stereo, along with inputs that accept the speaker-level signal from a factory radio.

You can use the low-pass crossover to get your bass to mesh with the rest of your system, while the phase switch ensures that this sub is working together with the bass from your full-range speakers. Focal includes a wired remote control so you can adjust the bass with a flick of your wrist.

Product Highlights:

  • compact powered subwoofer
  • aluminum enclosure with 8" sub
  • built-in amplifier (75 watts RMS/150 watts peak)
  • frequency response: 45-150 Hz
  • variable low-pass crossover (50-150 Hz)
  • phase control switch (0 or 180 degrees)
  • bass boost control (0 dB to +18 dB)
  • preamp- and speaker-level inputs
  • auto turn-on switch
  • wired remote control
  • 8- or 10-gauge wiring recommended (not included)
  • dimensions: 14"W x 3"H x 9-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Who needs a powered subwoofer?

To produce bass, you need a sub, an enclosure, and an amplifier, and it can be little tricky to match them all up. A powered sub eliminates all the hassle, as the manufacturer designs the enclosure to house the sub and amp together. This all-in-one solution is especially useful in smaller vehicles, where there's no room to mount a separate amp, or in any vehicle where you need every bit of cargo space. Powered subs range from small, flat boxes that fit under your seat to larger boxes that go in your trunk.

Focal Integration IBus 20 Reviews

Average Customer Review:

17 Reviews

Focal ibus 20

Written by: CBly from Tulsa, OK on September 22, 2015

Crutchfield Customer Review (What's this?)

Installed this in my 911, under passenger seat, plug and play, very easy to install, amazing sound,,,,,,

Pros: Small footprint, amazing sound, just what I needed to finish my system.

Cons: The Install manual is a little confusing, had to call Crutchfield and get help to understand, very helpful support department.

Focal Integration IBus 20

Written by: Jelly from BOSTON on August 2, 2015

Crutchfield Customer Review (What's this?)

F I R E!!! This thing rocks.....excellent sound.

Using 2 of them in a 2015 Subaru Legacy. Took the fake Harmond Kardon factory speakers out and put some older model Boston Acustics Pro Componets in the front and rear doors, nice highs and mids NO BASE. Added these and now the system is amazing. Very good quality bass not overbarring at all. The good thing is unlike back in the day no use box taking up trunk space just clean crisp quality bass. HIGHLY RECOMMEND this bass box. It's the best powered sub around, worth every penny.




Written by: jimmy t from Texas on February 28, 2015

I put this sub in a F150 crew cab and was not impressed when I first had it. It's powered by my factory deck so I wasn't expecting too much, but I was expecting more than I received. About 1-month ago I was carrying two, 1-gallon jugs of water in the back of the cab and spilled one of the jugs on the rubber floor mats I have protecting the carpet; the sub was on the mats so I was quick to get the water before it got to the sub. I cleaned the water and decided to put the sub under the rubber mats, since doing this the bass coming from the unit is noticeably improved, in-line with what I was expecting when I first chose it. I guess it was just a matter of too much space for a small unit.

Pros: size and weight

Cons: price is a bit pricey

Focal Sub

Written by: Dale Y from Albuquerque NM on September 28, 2014

Crutchfield Customer Review (What's this?)

Took some time to run power wires into cab and tap into back speakers.Factory F-150 with Focals in doors and new Sub is now ROCKIN'!! not too much bass, just enough to fill in the bottom end This will NOT rattle windows

Pros: Doesn't take up too much space like a sub box would. good bass

Cons: Install..... need I say more

Great Add-On

Written by: BM from Minneapolis, MN on August 19, 2014

Crutchfield Customer Review (What's this?)

For the size, this unit has great sound and is very well constructed. I added this to my 2014 Subaru XV Crosstrek and it nicely filled in the missing bottom end. If you're looking for something with good sound and not just bass to overwhelm your music, this is a great choice.

Pros: Compact Build Quality Easy Install

Cons: None

Perfect Upgrade

Written by: Allan from Lugoff SC on July 14, 2014

Crutchfield Customer Review (What's this?)

I originally purchased the Sound Ordnance underseat subwoofer but after 2 failing I upgraded to this. This was a huge upgrade, much better build quality and sound. It is slightly larger so may have some issues fitting it under all seats. I have a 2009 GMC Sierra Hybrid and it fit under the front driver seat just fine. Perfectly rounded out the lows and sounds much better than a stock bose system if you have one of those. Keep in mind this is a European product so the harness will most likely not be plug and play to an American vehicle. You will have some rewiring to do if you want to use the high level inputs. Preamp out would be no different

Pros: Build Quality Sound Quality


Focal Integration IBus 20

Written by: Scott from Alto pass il on June 25, 2014

Crutchfield Customer Review (What's this?)

Excellent fits under jeep seat

Pros: Size and power

Cons: None

iBus 20

Written by: Dmcl from Sonoma County CA on March 28, 2014

Crutchfield Customer Review (What's this?)

Nice, compact unit. Does what I expected: filled out the bottom end of the spectrum. No breaking windows or setting off car alarms as I drive by. Nice solid bass for the money and the size. Replaced Harman Kardon powered sub (2 - 6x9) in BMW E46 Coupe. Pretty easy install.

Pros: Size, build, performance. Good value.

Cons: None.

focal rules

Written by: jason from hickory nc on March 1, 2014

Crutchfield Customer Review (What's this?)

great addition to any stereo adds just enough bass to a stereo not over the top not too much and is rugged enough for any application great size slim design allows you to put it under seat

Pros: great sound just enough bass

Cons: none

Focal compact sub

Written by: Steve D from Thomasville, PA on January 1, 2014

Crutchfield Customer Review (What's this?)

Great sub in compact design, does everything I wanted.

Pros: Size, quality sound out of compact unit.

Cons: none


Written by: Concrete Mary from Euless, TX. on December 21, 2013

Crutchfield Customer Review (What's this?)

I guess you can call me a Focal freak! I bought this sub because it was small enough to fit under the seat of my single cab 2001 Ford Lightning, this sub is well made sounds great, thats something you can count on from Focal speakers I have them in all 3 of my vehicles


Cons: NONE!

Good Little Sub

Written by: Mike02z from Lake Ariel, PA on July 17, 2013

Crutchfield Customer Review (What's this?)

I picked this up to add some bottom end to my 2014 Forester. This sub/map fills the bill nicely. It first almost perfectly under the front driver seat, sounds good and gets plenty loud enough for my purposes. This will not win any SPL contests but does provide solid bass and seems like a well built device.

Pros: Solid Build Quality Sound Quality Design

Cons: Pricey for the power

Focal Integration IBus 20

Written by: Joey from Pensacola on June 15, 2013

Crutchfield Customer Review (What's this?)

What a great sub. I have a Tacoma reg cab w/Focal 165's in the doors. This sub compliments them perfectly. More than enough bump. Very happy....




Written by: grandaz from New Jersey on April 14, 2013

Crutchfield Customer Review (What's this?)

Let me start by saying my 2012 Corolla has Focal p165v30 component speakers in the front and Focal 690 CA1 SG coaxial speakers in the back powered by a Alpine MRX-V70 5 channel amp, and a factory Pioneer navigation head unit. So I am a die hard Focal supporter and truly believe they make incredible products. However this unit is junk, I had my entire system installed by a local shop, who's owner has been awarded #20 installer in the entire USA three year in a row. He told me to stay clear but I really wanted this unit due to its size. I was able to bolt it directly to my cars rear seat and it took up virtually no space. However it produced very little bass even when turned all the way up. This sub was barley able to shake the seat it was bolted too. Then after a short two weeks it blew a voice coil, I was devastated and shocked because its a Focal and at this price. The owner at the audio shop ordered me a replacement and even put it in for free. Three short weeks later that one blew the circuit board. Finally I had it taken out and was livid to say the least. The shop owner suggested that I buy the JL CP108LG-W3v3 and bolt it in the same location and since I already had a 5 channel amp wiring was a breeze. Man am I happy I took his advice now this is a sub. It shakes my car like nothing I ever seen before. A complete night and day experience. All I can say is Focal should be ashamed of themselves for ever putting this on the market. STAY FAR AWAY !!

Pros: None

Cons: It does not produce much bass at all even in a small sedan. It breaks esaily.

Great for a boat

Written by: CDR from Chesapeake Bay on April 12, 2013

Crutchfield Customer Review (What's this?)

I wanted a subwoofer to put in the cabin of my boat. I did not want to cut holes or see the subwoofer when I was finished. An integrated subwoofer seemed to be the best option and the Focal looked like a quality product. The Focal is well made with a heavy aluminum case. I installed the subwoofer in a locker that also holds an air conditioner. This means that there is a large vent in the locker that will allow the sound to escape. It took a little while with the adjustments as there was some boominess at certain frequencies. I'm pretty sure the boominess was due to the install location rather than the subwoofer itself. The system sounds great without a big speaker grill located in the cabin. I recommend the Focal IBus 20 if you need more bass but don't want a big box or speaker grill. The Focal is not water resistant, so make sure it is installed inside your boat.



Doesn't fit Honda FIT

Written by: nestaselect from ATL on February 11, 2013

I can't speak to the sound quality. The build seems VERY solid. I couldn't use it because I needed something to add Low-End to my Honda FIT without taking up valuable cargo space. Unfortunately, the only place that this will fit is in the rear cargo area..That doesn't work for me.



great little sub

Written by: Chris A. from Honolulu, HI on January 31, 2013

Crutchfield Customer Review (What's this?)

I have a Toyota Tacoma extended cab truck and I wanted a SUB but not the usual set up of a big enclosure taking up space. I research and I came upon the iBUS 20 by Focal and I glad I did. This little sub packs a punch literally. There is also a bass knob control which you can fine tune to your liking. I have it a little over 2 months and just turn the gain up and its sounds amazing. If you are looking for something to rock the neighborhood, look else where but seriously, this compact sub will make your sounds fuller, your bass bumps, and make your drive enjoyable.

Pros: Space saver, Great sound. No complaints

Cons: You may need to get an amp wiring kit. The plug and play harness cables included (ISO cables) does not work for my vehicle. I think they are for europeans cars.

Hands-on research

What's in the box?

Download owner's manual

  • Amplified subwoofer
  • 9.5' Wiring harness (Power with in-line fuse holder/ Ground/ Remote turn-on/ Speaker level input)
  • Three 15 amp ATO fuses (2 installed in the subwoofer chassis/ 1 installed in the power wire fuse holder)
  • Remote bass level control
  • 18' Remote cable (RJ-25 plug on both ends)
  • Two 2" x 8" Adhesive backed hook and loop mounting fasteners
  • 4 Rubber feet
  • 8 Flat washers
  • Eight 3/16" Pan head screws (to mount the feet to the subwoofer)
  • Four 7/8" Self-tapping pan head screws
  • One 1/2" Self-tapping pan head screw (to mount wired remote)
  • Owner's manual (English/ French/ Russian)

Features and Specs

Enclosure Type Sealed
Finish Material Aluminum
Grille Metal
Connector Type Set screw/RCA
Bi-amp Inputs N/A
Woofer Size (inches) 8
Woofer Material Not given
Passive Radiator ---
Width 14"
Height 3"
Depth 9-7/8"
Second Depth N/A
Parts Warranty 1 Year
Labor Warranty 1 Year
Frequency Response 45-150
Amplifier Power (RMS) 75 watts
Maximum Wattage 150 watts
Sensitivity N/A
Impedance N/A
Second Voice Coil Impedance N/A
Crossover Point 50-150

Product Research



Overview: The IBUS 20 amplified subwoofer features a 75-watt RMS (150-watts max) amp and an 8" sub housed in a compact aluminum enclosure, designed to fit in tight spaces.

Wired Remote Control: The wired remote control puts control of your subwoofer output within easy reach. The remote can be mounted using the included self-tapping screw. The dimensions are:

  • Width: 1-3/16"
  • Height: 1"
  • Depth: 1-3/4" (2-3/8" including the knob)

Mounting: The subwoofer, under 3" tall, can be mounted flat under a seat in the passenger compartment of many vehicles.

Subsonic Filter: Frequencies that cannot be reproduced by the subwoofer do not become sound, but unnecessary oscillations causing distortion; these frequencies also waste amplifier power and can damage speakers. The subsonic filter removes inaudible frequencies to improve the performance of the speakers by eliminating this harmful distortion. The subsonic filter's crossover point is variable from 20 to 50 Hz.


Gain: rotary dial to set the amplifier gain control; 200mV to 5 volts

Subsonic Filter: rotary dial to control the high pass crossover frequency; 20 to 50 Hz

Bass Boost: rotary dial to adjust the bass boost; continuously variable from 0 to 18 dB; boost centered at 60 Hz

Crossover Frequency: rotary dial to control the low pass crossover frequency; 50 to 150 Hz

Auto Turn-on: two position switch

  • On: amp turns on when a signal is present on the speaker-level input
  • Off: amp turns on when 12 volts is applied to the remote turn-on wire

Phase: two position switch; set the subwoofer phase to 0° or 180°


Power: set screw terminals for power, ground, and remote turn-on; each accepts up to 8-gauge wire

Line Input: stereo RCA inputs

Speaker Input: Molex plug for use with the included wiring harness

Remote Bass: RJ-25 jack for use with the included wired remote

Fuses: two 15-amp ATO fuses installed in the chassis

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

Crutchfield asked  
Why did you buy this?

I really like Focal products I currently have all of there speakers in my car and I like them [ MICHAEL  Dec 12, 2015 ]

2 questions already asked

You probably need to get any kind of power plug/connector, the thing comes with bare wires out of the box. [ JOSE  Feb 05, 2015 ]
you have to buy those [ DENNIS  Feb 05, 2015 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Krissy  Apr 14, 2014 ]  Staff