Rogue Audio Cronus Magnum III schematic request / mod help

[SoaDMTGguy]

I want to get a Cronus Magnum. However, my speakers (Vandersteen Quatro) require a high-pass filter inserted between the pre and power amp stages. They provide an inline RCA filter, but that wont work for an integrated. I know it's possible in theory to add such a filter internally to an integrated amp, but without a schematic, I don't know where I would insert it.

 

[jan.didden]

What should be the turnover frequency of the high-pass? Slope?
Does Vandersteen specify that?

Edit you might want ton try the external filter between your source (if it is analog) and the line input.
Chances are it'll work fine.

Jan

 

[SoaDMTGguy]

First order high pass, down 3 dB at 100 Hz. It will work on line input, so long as the input impedance of the preamp is constant and not affected by the volume control. Plus I would have to put one on each input, and I only have one supplied. Also not sure how it would work on tonearm input pre-RIAA correction.

 

[jan.didden]

That's odd, to high pass at 100Hz.
Do you get any bass from that?
Is it a mono filter? Then you must reverse engineer and copy.
You know, 'diyaudio' 😎

Jan

 

[SoaDMTGguy]

The speakers have powered subwoofers and the internals reconstitute the low end to be level again. The point is to take the load off the primary amplifier.

There are two filters, one per channel.

I could DIY if, I’d just like to do it internally, not on every input. Because I’m not sure if they will work due to variable impedance, and due to phono input.

 

[jan.didden]

But if the speakers have each one subwoofer, the filter must be stereo/two channel.
Or is there only one single sub?

Jan

 

[SoaDMTGguy]

There are two filters, one for each channel.