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SSL S4EQ Four Band Preamp Equalizer with Subwoofer Output and Dual Color Illumination

by SSL

Price: CDN$ 52.50 & FREE Shipping. Details
Only 2 left in stock (more on the way).
Ships from and sold by Gift-wrap available.
16 new from CDN$ 38.99
  • Front, rear and subwoofer outputs
  • THD: <0.01%
  • Signal-to-noise ratio: >90dB
  • Dual color illumination
  • Gold-plated connectors
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Product Details

  • Product Dimensions: 22.6 x 19 x 4.6 cm
  • Shipping Weight: 612 g
  • Batteries 1 12V batteries required.
  • Item model number: S4EQ
  • ASIN: B000O50VEQ
  • Date first available at April 25 2011
  • Average Customer Review: Be the first to review this item
  • Amazon Bestsellers Rank: #62,554 in Electronics (See Top 100 in Electronics)
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Product Description


The Sound Storm S4EQ graphic equalizer is a high-Fidelity signal processor/preamplifier that allows you to graphically view and individually control a number of different frequency bands in a stereophonic system. It is intended for use in a car audio system which includes amplifiers in a signal path AFTER the equalizer, and provides front, rear and subwoofer low level outputs via RCA connectors.

Power Connections
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Please note that this equalizer contains an internal ON/OFF switch which is activated when the head unit is turned on. For this reason, to use the equalizer, your head unit must have a remote turn on lead.

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Audio Connections
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Top Panel Controls And Features
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Front Panel Controls And Key Features
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Customer Reviews

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Most Helpful Customer Reviews on (beta) HASH(0xa8abca14) out of 5 stars 123 reviews
40 of 43 people found the following review helpful
HASH(0xa8a00408) out of 5 stars Great bang for buck Feb. 11 2011
By HeavyDuty - Published on
I have been into car audio since the 1980s.

Ran across this unit which specified it had a variable subwoofer xover from 30Hz to 250Hz. The reviews were good so thought I'd try it out. The xover on this unit works great!! for this price.

I've used a few crossovers in the past and this one I like very much.

As far as the equalizer I cannot comment, since I have not used it, but the pots/controls on this unit are tight and seem to be pretty good quality. I do know that the equalizer controls do Not seem to effect the subwoofer output, so probably only effects the front and rear outputs on this thing.

The subwoofer gain and the master volume gain work great as well.

The unit looks nice too. Plexiglass top looks cool.

Was thinking to purchase an extra one for backup. It's hard to find good equipment, especially when stuff that you like gets discontinued.

They say you get what you pay for, but I think you get a little more than you pay for with this unit.
22 of 24 people found the following review helpful
HASH(0xa92810f0) out of 5 stars Great little unit, one moderate flaw Jan. 3 2012
By K. Klemple - Published on
I have never owned an in-dash EQ before, but I am an Audio Engineer by profession, so I know a fair amount about audio. I bought this unit to give me greater control over my 4-channel amp and my monoblock sub amp. This unit is hands-down much better than your average head-unit's EQ. I love the crossover freq knob for the sub channel. This is crucial and I will never live without one again. Having the subwoofer volume and fader right at my fingertips is also tremendous. The unit seems well-built, and I am getting LOTS of clean signal with this EQ. Just some slight hiss when all is quiet. You can even cut back on the high freq knob to get rid of most of the hiss if needed, but it is VERY minor.

On to the flaw of this unit:

The 4-band EQ is heavily congested in the lower-mid spectrum, and only gives you one band for high frequencies. That normally wouldn't be so bad, but the top band is 20KHZ which is at the VERY top end of what you can hear. Pair that with the fact that the "mid" band is set at 1khz (too low) and you have a HUUUGE gap in the frequency band that you can do nothing about. I ended up using the mid and high bands from my head unit to give me more control. I find it hilarious that 2 of my 3 bands in my in-dash fit in the hole this unit left. I will try to show how much of a gap this unit has:


Hopefully this will visually show you what I am describing.

Having said all that, I am still extremely happy with this unit. It has boosted the signal, given me greater control, and it even looks very nice. I would recommend this unit to anyone on a budget who really gets into the hobby and wants more stuff to play with, and better sound.
12 of 12 people found the following review helpful
HASH(0xa92813c0) out of 5 stars Very versital Sept. 16 2010
By MoonUnit - Published on
Verified Purchase
I bought this to control my three amps, my sub amp and my rear amp and front amp. It is not a "graphic Eq" as advertised but a parametric Eq, that makes no difference in sound though! It does sound great and does not add any noise into the system. It is nice to be able to control not only the frequency but the volume of the sub amp as well. It is a nice quality unit especially for the price! The control knobs are a little small but once set I rarely ever touch them. The case is well built and has an interesting clear top panel that shows the circuitry inside, kinda neat but it really cant be seen once it's mounted, at least the way I have it mounted. This is the fourth SSL product I have purchased and I am very happy with the quality of all the units I bought. The prices are excellent for what you get! I bought three SSL "Evolution" amps as well and have ran them very hard for a long time, even at two ohm loads and they run cool and have never gone into protection even once. I will continue to buy from them as long as they keep their prices low!
14 of 16 people found the following review helpful
By CHINCHEK72 - Published on
Verified Purchase
I think by FAR this eq is the best of all the ones ive used before. Great product at a great price! I am very happy
15 of 18 people found the following review helpful
HASH(0xa894a750) out of 5 stars Bang for your Buck Dec 29 2009
By sir_cheapy_software - Published on
Verified Purchase
I needed a passive device that would control various settings for my car subwoofer including a dedicated volume control for the sub only, I could not be happier with this purchase. This unit turns on with the head unit and also allows a separate IPod or accessory input to the EQ, faceplate illumination can be changed from green to red, (I needed Red), also has line level input adjustments so any input you supply to EQ can be modulated to be the same volume as head unit. In other words if you have a CD Changer unit separate from your head unit when switching from a CD played in the head unit and another being played from the CD changer in the trunk there will be no marked volume difference between the units. Nothing worse than having a nice song playing at a medium volume level to then be followed by one that scares the bejezzuz out of you because it is five or six volume settings louder because of a line level input difference. This unit makes all of your different speakers and input devices work nice together, well worth the money

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