Bi-amping with Chipamps

[AndrewT]

Hi,
I think I got that right.
I read it three times before I posted and re-read after posting.

Take a wideband amp with F-1dB range of 4Hz to 90kHz.
The high Pass Filter is ~2Hz. Raise this to F-3dB=250Hz.
Use this adjusted amplifier with an F-1dB range of 500Hz to 90kHz to drive the treble of the passive crossover speaker.

 

[AndrewT]

At the end , if you replicate the same X-over center point , you just won't need the passive ones

it's not nearly as simple as that.
Any one can replicate the crossover point with a pair of filters. One can choose single pole or two pole or three pole. You will rarely find a four pole passive filter to replicate.

Now listen to the passive version and the two filtered active version. They will be quite different.

 

[picowallspeaker]

Yesssorry ! I forgot to say : putting into the equation also the natural 2nd order filter given by speaker + enclosure . Moreover ,that can't be done with a commercial cabinet .Speaker type ,box size and geometry , extra filters (such a protection cap for HP),amplifiers ,passive or active line crossovers ...we're lucky ! The "source" is independent

 

[Gopher]

Andrew

Thanks for the specific help there. What frequency limits would you suggest for the bass/mid amp? The Diamond 9.1 has a bass/mid to treble xover frequency of ~2kHz and is flat'ish (if you ignore the engineered bass hump) to ~100Hz before it starts falling off. I plan on using them with an optional Wharfedale SW150 subwoofer.

 

[AndrewT]

do the bi-amp experiment first.
decide if you want to develop 4 amplifiers to do that job.
Only after that decision is clear, expend time on the next experiment.
You can use the first temporary stereo amplifier and one new chipamp to do this.