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Home > Amplifiers > Multi Channel


Part Number Q4-120
review 11 Review(s)
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Retail Price:  $598.00
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The Q4-120 is the most versatile amplifier in our lineup. With its feature rich design you're able to power a complete system, including the mid/highs and the sub off one amp. It features a high power 4 channel class A/B output section that delivers superb sound quality and ample power to drive multiple arrays of speakers. The 120.4 features variable high and low pass filters that can also be used in a band pass configuration. The 120.4 also has variable bass boost, remote gain control w/ clipping indicator, and RCA pass through jacks to optimize the amplifier for multiple types of installs. 
  • Stable down to 2ohm Stereo or 4ohm Mono
  • Stereo Audio Outputs for Daisy Chaining multiple amplifiers 
  • Four way protection circuits: Speaker shorts, DC offset, High/Low voltage, Thermal protection
  • Double sided boards with high current MOSFET switching devices
  • 24db/oct slope crossovers, Fully adjustable High Pass, Low Pass Filter and Band Pass Filters
  • Includes Remote Gain Knob (for use in BP/LP mode on channels 3/4)

Model Q4-120
Dimensions15.75" x 9"
Input Sensitivity8V~0.2V
Low Pass Filter50Hz ~ 5kHz
High Pass Filter20Hz ~ 5kHz
Crossover HPF/FULL/LP-BP
Remote Gain Control Included
Clipping Display LedYes
Signal to Noise Ratio105dB
Damping Factor200 <
Bass Boost @45Hz 0~18dB
External Fuse Rating40A x 2 pcs
4 ohm power @ 14V 120Wx4
2 ohm power @ 14V 170Wx4
4 ohm mono power @ 14V 340Wx2
Power and Ground Inputs 4ga
Reward Points 200 points will be rewarded to you when you buy this item.
Customer Reviews
Rating Decided on this amp after shopping around
I bought the Q1200 for my sub amp (after shopping around) and was extremely impressed with the quality pushing an SA-12. Thought this year it was time to upgrade the doors and dash and got some polk db components for the front and coax's for the rear. I don't mind mixing brands, I just want the best bang for the buck. It was down to these guys, Crescendo, PPI, Rockford, and a few others. Was really considering a Focal with the same specs for $150+ more, but my sub amp sounded so badass I went ahead and got this Q4-120 to drive the front stage and the coax's. I'm so glad I did, I've got the gains cranked just over halfway and the thing can get those Polks so loud it hurts, but it's crystal clear, and sound quality was what I was after. It's amazing. I've only listened to it for a couple days and am already blown away. Wholeheartedly would recommend this amp. OKC representing the car audio scene!
  Reviewed by:   from Jenks, OK. on 7/23/2014
Rating Nice amp
This is a real nice amp. I have it running two sets of RE audio XXX 6.5 component sets. They are 2 ohm speakers and this amp powers them no problem. I would recommend the amp to anyone
  Reviewed by:   from Washington. on 5/25/2014
Rating very impressed
I must say one of the best 4 channels I have owned. Does not over heat and puts out a great deal of clean power. Right now it has been running 2 crescendo 6.5's and 4 FT1 super tweeters. Love this amp and wouldn't go with any other 4 channel.
  Reviewed by:   from Michigan. on 3/28/2014
Rating Extraordinary.
I have had several different 4 channel amps mostly all temporary, ranging from Kicker to Rockford Fosgate. But this amp is definitely a keeper. The sound quality and power that it provides for the price is unmatched. I have it running my AQ/SQ components and tweets/super tweets, and they scream. If you're looking for a great quality product with great sound quality at a great price, this is the amp for you!
  Reviewed by:   from Las Vegas . on 3/24/2014
Rating Unheard of pricing on a powerful 4 channel
This was the first time I had purchased one of Soundqubeds multichannel amplifiers. For a long time I only had the need for quality subwoofer amps, I was used to the $30 craigslist 4channel I purchased years and years ago. I wanted to see what a quality AB amplifier sounds like:) This product is a powerhouse! I loved it so much I decided to buy 2 of them and run a 6channel active front stage :) Couldn't be happier
  Reviewed by:   from Minnesota. on 2/19/2014
Rating 120.4
great amp. this replaced my american bass 350.4 which was rated 50rms per channel higher than this so at first was skeptical but i can actually play louder and clearer with this because the crossovers are so much wont regret buying this amp its so clean once you set it right you will be more than thrilled with it. future plans include the SQ pro audio 6.5s and tweeters
  Reviewed by:   from Lovington. on 4/26/2013
Rating AQ 120.4
When the package for this amp came in, I noticed how well packed and heavy this amp was. The build quality is astonishing and in my 25 years of being in car audio is one of the best I ever seen. Even better once I installed the amp and set the gains is that this amp doesn't add or subtract from the music. To make things even better, I got this amp on sale for $254. I liked it so much I bought the AQ 2200D on sale also.
  Reviewed by:   from Buena Park. on 1/5/2013
Rating nice
prior to running the 120.4 i had the 90x4 running my mid channels, and i must quite impressed with the improvements made with this amp. Not only have the power levels been raised from the previous generation, but it would seem the build quality itself has raised...of the things i noticed, the crossover levels seem much closer to those shown on the amp than previously, and where the 90x4 would never go into protect..the 120.4 will if everything is not as it should be. this means a safer, more reliable product, in my mind at least...excellent upgrade for anyone looking for a little "more" out of their mids n highs! it should be noted, and this is not a compliant..but the ch 3/4 slave function is no longer on these whereas it was on the 90x4..not a big deal, but something im sure others running active front stages with separate mids/highs amps would want to know. a simple y splitter solves that though.
  Reviewed by:   from salem,illinois. on 10/11/2012
Rating AQ 120 x 4
This a great 4 channel with nice looks and build quality you'll find with all AQ products. Glad they finally added the bolt on rca inputs was a must. Sounds phenominal. Thank You DJ & the gang for many years of great service and products to come. Here is to the new SQ products. Highly recommended
  Reviewed by:   from Socal. on 9/22/2012
Rating AWESOME!!!
This amp is absolutely awesome, I've had a whole pile of different amps, and none have compared to the clarity and efficiency of either this amp or the AQ1200.1d I have beatin my subs... If you haven't tried AQ amps, you are missing out.... P.S. Thanks for the shirt!
  Reviewed by:   from Alaska. on 8/24/2012
First owner to have one of these awesome 4 channel amps, would recommend this to anyone looking for a powerful 4 channel with great SQ for mids/highs. This amp replaced my memphis mclass 4 channel and this AQ amp was a step in the right direction. I am very happy with this amp and it compliments the rest of my AQ equipment in "The Black Nasty".
  Reviewed by:   from Mayflower, AR. on 6/17/2012
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