I am about to design an adjustable lowpass filter for subwoofer, including these features:
- Summing both incoming channels after buffers
- Sallen-Key for easily adjustable crossover frequency, 24 dB/octave. Would you use trimmers/potentiometers or just jumpers (maybe four selectable frequencies)?
- Differential output for easy inverting and bridging.
Is phase correction necessary?
How about subsonic filter even if I dont play vinyls? Maybe doesnt have to be very steep?
What do you think about this circuit: P48 Sub-Woofer Controller (Rev-A) ?
- Summing both incoming channels after buffers
- Sallen-Key for easily adjustable crossover frequency, 24 dB/octave. Would you use trimmers/potentiometers or just jumpers (maybe four selectable frequencies)?
- Differential output for easy inverting and bridging.
Is phase correction necessary?
How about subsonic filter even if I dont play vinyls? Maybe doesnt have to be very steep?
What do you think about this circuit: P48 Sub-Woofer Controller (Rev-A) ?
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I'm planning to try a bigger main board, with power supply
and small ad-on crossover boards with print connectors
i've building my sub, for now it has a low pass filter, a pot for volume control and a parametric eq for correction of room gain, and maybe a preamplifier
I am now finalising the circuit and starting to draw a PCB. It will be adjustable to the extent of replaceable resistors in IC sockets, not by trimmers. The subsonic filter will be simplified with only 6 dB/octave
But is a phase control necessary or would a simple invert switch be enough? Perhaps the phase control also does more harm than good? I have been looking at this: Project 103 - Subwoofer Phase Controller .
But is a phase control necessary or would a simple invert switch be enough? Perhaps the phase control also does more harm than good? I have been looking at this: Project 103 - Subwoofer Phase Controller .
maybe put the phase adjust circuit on a separate board, so it can easily be switched in or out, or replaced with another try altogether.
DIP sockets for swappable capacitors.
Keep the resistors fixed to maintain your designed DC offsets and noise and gain and stability and Q all at the required values.
Keep the resistors fixed to maintain your designed DC offsets and noise and gain and stability and Q all at the required values.
Another approach would be to make a true crossover network incorporating the high-pass characteristics of the "satellite" speakers. See Siegfried Linkwitz for details. Phase corrections and such are bandaids, and a defined crossover is just as easy to do for DIY.
All good fortune,
Chris
All good fortune,
Chris
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