ISP's Decimator technology defines a new standard in real-time noise-reduction performance for high-gain amps.

The Decimator ProRackG stereo guitar noise reduction system establishes a new standard for excellence in real time noise filter performance. The Decimator ProRackG was designed to provide the maximum possible performance in a rack mount dual channel noise reduction system designed specifically for extremely high gain guitar amplifiers. The Decimator ProRackG is designed with 2 channels of single ended noise suppression configured specifically for high gain guitar applications allowing one channel to deliver noise reduction for the guitar directly and a second channel to eliminate amplifier gain noise. A separate guitar buffer input and output optimizes your guitar signal.

Channel one eliminates 50 or 60 cycle hum, buzz, stage light noise and any other noise picked up directly by the instrument. The ProRack channel one output drives the front end of your guitar amplifier and eliminates all of the input noise picked up by the guitar. The control circuit of the second channel detects and tracks the guitar signal directly while the signal processing audio chain is patched into the effects loop of the high gain guitar amplifier. Now you can quiet down even the most insane amounts of noise with any amplifier system incorporating a series effects loop. The Decimator ProRackG will also solve the typical high gain feedback or squealing problem high gain guitar players fight.

You know how difficult this problem can be. You play staccato notes and in between each note you have a squeal or burst of feedback that's virtually impossible to control. Problem solved with the Decimator ProRackG. By proper setting of the threshold for channel one and channel two you can eliminate this problem for good.

The Decimator ProRackG has dual processing channels incorporating both low-level downward expansion and dynamically controlled low-pass filtering in a very easy to use single rack space unit. The ProRackG is based on ISP Technologies patent pending "Time Vector Processing," which provides the most adaptively dynamic release response characteristics of any real time noise reduction system. The Time Vector Processing dynamic response circuit is used to control the release time constant of both the downward expander and dynamic filter. Not only does the Decimator ProRackG deliver the most stunning noise reduction, it also solves the problem of needing to adjust the Threshold setting every time you change gain or switch channels.

By using the input guitar signal to drive both channels' level detection circuitry, the ProRackG noise filter system needs no other adjustments once the thresholds are set based on the guitar input. This will give you the correct threshold with clean, crunch and even monstrous amounts of gain and if you use pedals you can insert them in the loop between the output of the Decimator Channel 1 and the input of the guitar amplifier.

For hardcore rockers that want face-melting levels without noise. Put it in the cart!

ISP Technologies Decimator Pro Rack G Stereo Noise Reduction System Specifications:

• Input Impedance: 470KOHM
• Output Impedance: Less than 1KOHM
• Maximum Input Level: +20dbu
• Guitar Buffer Input Impedance - 470K ohm
• Guitar Buffer Output Impedance - Less than 100 ohm
• Channel 1 & 2 Input Impedance - 20K ohm
• Dynamic Range: greater than 118db Typical
• Effective Noise Reduction: greater than 120db
• Power Consumption: 350mA
• THD: Less Than .05%
• Dimensions:1.75" H x 19" W x 7" D

ISP Technologies Decimator Pro Rack G Stereo Noise Reduction System

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iSP Decimator Pro Rack G

Posted by DRAGONFLY from Toronto, Canada. on May 8, 2009

Experience w/product: I have used it

Reviewer's Background: Active gear head!!!!!!!!!

Reviewer's Play Style: Hard Rock

I bought this unit expecting big things. Unfortunately, I could not get it to work with my gear at all. I even called iSP directly. They were very good people and I hooked it up as they suggested with also terrible results. Went to music stores and on line with anybody who could help work this out, but to no avail! I eventually had to return it after spending countless hours trying to make it happen for me. I own very high-end gear, cables etc. but couldn't figure this out! Anyhow, thanks to iSP and everyone else who tried to help, I really do appreciate it.

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Easily the finest Noise Reduction unit ever built!

Posted by Dogstarr from Atlanta on Apr 10, 2009

Experience w/product: I own it

Reviewer's Background: 20+ years Player/Producer/Engineer

Reviewer's Play Style: Classic Rock, Alternative, Metal, Tribal.

I decided that I'd go out on a limb and get one of these units based on the sound clips from the ISP site, I figured that with the 45 day satisfaction guarantee, really had nothing to loose. I've used other NR units, never found one that really worked without messing your sound up in some way. Well the ISP is different; You really get rid of noise and hiss without cutting your tone, or sustain.

Just keep in mind the philosophy behind this unit is unique, it tracks your input from the guitar and goes directly after your preamp (or in your FX Loop), it should always go in front of Delays and Reverb so that they get a crisp, clean signal, if you put it after Delay, or Reverb, your signal will be cut off when you stop playing.

As ISP says, it's really for high gain players that want to be rid of the high gain amp noise, 60 cycle hum, etc.

I should mention that it's built like a tank, made here in the USA and looks like a rack unit from the late 80's, early 90's (solid metal construction, nothing fancy, but super functional).

The only reason I give it less that a 5 on features, is it doesn't offer balanced In/Out, which would be helpful in the studio.

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Good God

Posted by Randallgod01 from North Carolina on Dec 16, 2008

Experience w/product: I own it

Reviewer's Background: Gigging Musician

Reviewer's Play Style: Metal, Metalcore, Groove Metal

so uh...I have one of these rack mount units...and its like...wtf?

I sort of just plugged it in about 10 minutes ago with my peavey 5150 II, and I turned the amp on to stanby to warm the tubes up and left it sitting there. I came back about 10 to 15 minutes later, and turned the amp on. I started messing with the thresholds on each channel and then suddenly....nothing.

I thought my amp just broke. I seriously did. But the my arm rubbed aggainst the strings and I could hear it. With this in lilght, I started playing...

...speechless.

Like I dont think its fair to anyone else in the world to have this unit. Its retarded (in a good way). If it were up to me, I serioulsy would of paid a lot more for it now that I now how much this baby smacks me.

Rob Arnold from Chimaira uses, I have seen other people using it, and now I freakin use it. AWESOME

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Complete noise solution!

Posted by Jonny 7 from Wichita, KS on Nov 22, 2008

Experience w/product: I own it

Reviewer's Background: Active Musician

Reviewer's Play Style: Metal, Rock, Blues

I play a high gain set up. This unit completely got rid of all the ground line hum and with a little bit of tweaking, got rid of all the unwanted feedback. At any volume, with any amount of gain, I can play short staccato bursts with rests and it sounds like my amp is off between notes. If this unit ever broke, I'd definitely get another one!

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ISP Technologies Decimator Pro Rack G Stereo Noise Reduction System

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ISP Technologies Decimator Pro Rack G Stereo Noise Reduction System

Read 4 Reviews