Amp Pro -> PEQ just on the sub out ?

[manudrz]

Hi, I'd like to know if it would be doable to have the parametric EQ separate for main output and the sub out ? For exemple 8 of 10 EQ to the main output and 2 for subwoofer ? I think it's my only option to put a linkwitz transform without messing my main stereo speakers.
Anyway, thanks a lot, I love my Amp Pro

 

[Wiimer]

Hi, I'd like to know if it would be doable to have the parametric EQ separate for main output and the sub out ? For exemple 8 of 10 EQ to the main output and 2 for subwoofer ? I think it's my only option to put a linkwitz transform without messing my main stereo speakers.
Anyway, thanks a lot, I love my Amp Pro

Hi

I know this may not be helpful, but I have a splitter adapter connected to the sub out of the WiiM Amp Ultra, and a 2 RCA cable to the line in of the WiiM Pro. 2 subwoofers are connected to the Pro's line out. This allows the Pro's 10-band PEQ to be used exclusively for the subwoofers.

 

[manudrz]

Hum, thanks for the Idea but that's not really the way I'd like to take, double or triple conversion...
A few time back, I've tried SigmaStudio and if I remember well you can just add EQ where you want, til limits of your onboard DSP. Am I again the only one with tricky needs ?

 

[harkpabst]

I'm not quite sure I fully understand your problem. Are you using the automatic room correction process RoomFit or do you skip it and apply the PEQ filters for room correction manually?

If the former you can now apply an additional 10 bands of PEQ (or GEQ, which is not helpful here) for whatever you want on top of the RoomFit filters. This includes applying a Linkwitz transformation, of course. What's currently not possible is to apply the PEQ prior to performing a RoomFit run. You can set a fitting lower frequency limit for RoomFit, though.

If it's the latter you are totally free to place any number of PEQ filters below or above the subwoofer crossover frequency. They may not be technically reserved for the subwoofer output, but it's your very own decision to set the center frequency of any number of filters so low that it will only affect the sub.

This is relatively straight forward.

 

[manudrz]

Hello, I haven't used Roomfit yet so yes I use the PEQs manually. The PEQs applied as is influence the entire phase and impedance of my main speakers, I don't find this optimal. From my little knowledge I think it would be much cleaner to have a separate PEQ for the subwoofer output as I explained.
But thanks for the advice, I'll look into Roomfit soon, and I'm looking into adding 2 vents to my DIY sub so that might solve my problem.

 

[harkpabst]

Hello, I haven't used Roomfit yet so yes I use the PEQs manually. The PEQs applied as is influence the entire phase and impedance of my main speakers, I don't find this optimal. From my little knowledge I think it would be much cleaner to have a separate PEQ for the subwoofer output as I explained.

Don't worry. These are active digital filters placed before the power amplifier. They don't interfer with your speakers' impedance at all. The filter always just sees the constant and pretty much resistive input impedance of the power stage (mains) or the sub out buffer (subwoofer).

A high Q peak filter placed below the crossover frequency has no influence on the mains whatsoever. Each and every analogue (passive or active) or digital IIR filter will always influence the level and the phase of the signal at the same time. This is unavoidable. So, if you need to place a filter close to the crossover frequency (and consequently both the sub and the mains will contribute to the total output to a degree) you absolutely want the phase shift to be applied to both! Otherwise there was an inconsistency in phase that would lead to non-ideal accoustical summation.

From my point of view there's really no drawback to being able to distribute the filters freely across the frequency range.

But thanks for the advice, I'll look into Roomfit soon, and I'm looking into adding 2 vents to my DIY sub so that might solve my problem.

Give RoomFit a try. It works pretty well know.

If your sub's amp has the power and your driver has the required linear excursion there's nothing wrong with applying a Linkwitz transformation to a closed box design. Adding vents is means adding more variables to the equation. How did you calculate the enclosure before building this sub?