QuestionHey Brian, I have a question about my amp. It is a 500 w max, 2 channel bazooka amplifier. I have the manual for it and it says to use the low pass filter for a sub. However, when I turn the filter to low on the amp, my sub does nothing. It only works when it is on flat, not low or high. The sub is a brand new phoenix gold Rsdc 124. Could you help me tune the filter? Thanks in advance for your help.
AnswerHi Bryce,
That's an odd problem. It might go back to whatever you're using as a source for the RCA cables. Are they plugged into a CD player? If so, which output are you using?
The function of the low pass filter is to cut out anything above a certain frequency range, so that the sub only plays bass. Sometimes in addition to the filter switch, there's a dial that lets you set the actual crossover frequency. If you have a dial, then set it between 80 and 100. If the dial is set too low, you won't get very much sound through the sub on the low-pass setting.
If you're using an after-market CD player, there might be a high-pass filter built into the deck. Many CD players have a built-in crossover filter that cuts the bass out of the front and rear speakers. If your RCA cables are connected to the front or rear output, and the high-pass filter is turned on, then the high-pass filter will remove all the bass from the signal before the low-pass filter in the amp removes all the high frequencies. The result is no sound at all.
If this is what's happening, the best option is to switch the RCA cables to a subwoofer output, if the CD player has one. Otherwise, make sure the high-pass filter in the CD player is set to "off".
Good luck!
Brian
