Q: When using my ProRack G, if I bypass the second channel for the loop, I get hum and noise which isn't there at all when I'm not using the unit in a loop.
 

A: You have a ground loop in the system, you need to cut the ground between the send and return on channel 2. You only need to cut one end of the ground on your connecting cord but this will break the ground loop that you are describing and the system should not have any more hum than without the Decimator connected.

Q:  Why do noise gates add more noise to the amp and signal when bypassed vs. if it wasn't even there to begin with?
 

A: The reason you get more noise with anything plugged into the input of your amp is that nothing is as quiet as a cord. Any active unit has a noise floor even if it's down 120db it's still not as quiet as a cord. The input of your amp is amplifying the input signal depending on the amp settings for clean or distortion by 30 to 100 decibels. When you connect any active unit at the input it will amplify the noise floor by the amount of gain and you will see an increase in the noise floor. We use low noise audio operational amplifiers in the Decimator but they still have some noise that will be amplified when connected to the input of the amp. You should not see any increase in the noise floor when you connect the second channel and with the second channel active it should cut out all of the gain noise.

Q: What is the difference between the ProRack, ProRack G and The ProRack G Stereo Mod?

A: Click to read ISP Technologies Decimator Technology Primer.

Q: Where is the best place in the FX chain to place the Decimator (Rack or Pedal)?

A: The best place is typically after any high gain signal source such as an Overdrive/Distortion Pedal or strait into the FX loop of the amplifier. In the FX loop, it should be the first thing in the FX chain to capture hiss from the pre-amp in the amplifier. It is not recommended to be placed after Delay or Reverb effects as the Decimator's downward expansion can dig into the delay or delay effects.

Q: Will the Decimator take out HUM in my Guitar and/or Amp?

A: Yes it will if the HUM is in the signal source such as buzz from single coil pickups. The Decimator is considered as a "single ended" type of noise reduction. The signal is attenuated at the output of this design (Automatic Volume Control).

Q: How does the Decimator work the best in a Guitar/Amp system?

A: The Decimator will perform it's best if it can trace and detect the actual guitar signal. This will provide the best tracking of the circuit (Time Vector Processing Technology). This is the primary concept of the ProRackG, where the detection circuits of both channels are tied to the input of Channel 1. The guitar is connected to this input (here) and the output of channel 1 is linked to the input of the amplifier or pedal board (here). Channel 2 can be connected to the FX loop (here). The Decimator will always read the guitar directly for the best operation. 

Q: If my amplifier isn't powering up, what should I do?

A: First, make sure that your power cord is plugged in to a live, properly grounded outlet. If that checks out, make sure the power switch is turned to the ON position. If the cabinet still doesn't power up, you may have a blown fuse. Your best bet would be to find out how many watts the replacement fuse needs to be (this information will be located in your product manual) and replace it yourself (if possible) or to call iSP Technologies for further information.

Q: If my amplifier is losing volume, what should I do?

A: This problem may be due to a faulty instrument cable or even a faulty jack in the instrument itself. All cables used in your setup should be checked and inspected for proper operation. Another issue that could be giving you volume problems is that there is an internal decimator built into all of our guitar products. Make sure that the decimator threshold is not turned all the way up or you will not receive any sound. If all of these problems check out, then contact iSP Technologies for more information.

Q: How would I go about getting my speaker cabinet repaired?

A: If you can determine that you are having an internal amplifier problem, you may just remove that part of the cabinet and send it back to iSP Technologies. Please we ask that you write REPAIR DEPARTMENT in bold lettering on the package itself and have enclosed a detailed note, describing the problems that you are experiencing. Make sure to also label and document all connections before you remove them for trouble-free reassembly. Taking a photograph may also be helpful. If you cannot determine what the problem is, call our company directly and we can try and help discover the problem.

Q: Do I have to pay for the repair?

A: If you haven't already, now would be a good time to familiarize yourself with the WARRANTY that was included with your amp. Within it you will find all the information in regards to what is covered, how long it is covered, and what is required by the purchaser in order to obtain Warranty Service.

Q: If I loose my owner's manual, how do I obtain a new one?

A: iSP Technologies is currently in the process of putting PDF files of all of our manuals on our website, which any user can visit and download for free. Until that point in time you can email or call us directly and request a new manual.

Q: Where can I locate replacement parts?

A: Call iSP Technologies directly or email us and we will give you information on getting new parts for your cabinet(s).

Got a question about one of our products? email us at info@isptechnologies.com or call us directly, 248-673-7790 or 248-673-7696 (fax) We may just put your question on the website for everyone to view.