olds1959special
Major Contributor
I stopped using four amps to power my JBL L890's, thinking I didn't really need all that power. I went from 4 x 100watt to 2 x 100watt, and then connected the terminals in the back with jumpers. I noticed that the sound was brighter/had more treble, although had less presence and feeling of bigness overall. Interestingly, the overall loudness didn't seem to change much since I was basically using the same volume settings as before. I'm assuming that's because the amps are working harder now to compensate, does that change the sound quality and frequency response too?
I prefer using two amps instead of four because it's lower electricity usage, less chances for something to go wrong, and takes up less space. Also for whatever reason the music was getting up to very loud levels (think angry neighbors) but with the impression of added treble now maybe that won't happen anymore.
I'm running double bass with my KRK S10.4 R/L subs set at 90Hz, although it was at 80Hz when I took this measurement. Sorry for subjective descriptions, I still have to do more tests but so far I came up with this which I think is a 90 degree measurement.
Originally changing from four amps to two amps was an experiment to see if each set of amps was behaving differently since they are from different years and came from a different source. I wanted to see why the frequency response seemed so strange with the huge peak at 1kHz, since the high/low crossover in the speakers is at 700Hz. It turns out that this is from the speakers because I'm getting the same issues with only two amps.
Here's an older measurement with four amps although I may have had it setup using the crossovers in the subwoofers, or using Harrison HPF filters on the lows. This would be a 0 degree measurement.
I prefer using two amps instead of four because it's lower electricity usage, less chances for something to go wrong, and takes up less space. Also for whatever reason the music was getting up to very loud levels (think angry neighbors) but with the impression of added treble now maybe that won't happen anymore.
I'm running double bass with my KRK S10.4 R/L subs set at 90Hz, although it was at 80Hz when I took this measurement. Sorry for subjective descriptions, I still have to do more tests but so far I came up with this which I think is a 90 degree measurement.
Originally changing from four amps to two amps was an experiment to see if each set of amps was behaving differently since they are from different years and came from a different source. I wanted to see why the frequency response seemed so strange with the huge peak at 1kHz, since the high/low crossover in the speakers is at 700Hz. It turns out that this is from the speakers because I'm getting the same issues with only two amps.
Here's an older measurement with four amps although I may have had it setup using the crossovers in the subwoofers, or using Harrison HPF filters on the lows. This would be a 0 degree measurement.
Last edited:
