help! MiniDSP causes big distortion on big bass hits - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 16 Old 03-07-16, 04:58 PM Thread Starter
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Re: help! MiniDSP causes big distortion on big bass hits

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If that’s happening with a subwoofer, either Speakerpower's S/N noise figures (95 dB) are bogus, or the miniDSP has is generating a lot of noise on its outputs.
Before this, what I've experienced with sub noise is that you either have a high pitched hiss, which I've experienced with Crown XLS and Behringer iNukes, or you have a ground loop. The noise I'm getting is in between these tones, have no idea how to describe it but it's more of a low midrange thing.
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post #12 of 16 Old 03-11-16, 09:53 AM Thread Starter
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Re: help! MiniDSP causes big distortion on big bass hits

Here's what I'm dealing with here, and I'm just totally lost. The blue is what my raw response looks like when plugged into my receiver. The rest of the lines that are 30 db down are what happens when I simply plug the MiniDSP in. I don't understand this. I have been watching both the input and output gain and they stay below -10 which is in the green, which supposedly means it is good to go. All filters are bypassed, this is nothing but sending the signal through the MiniDSP. According to the blue, basically all I need to do is bump down 40 hz somewhat and I'm golden. Then I plug in the MiniDSP and I have other issues that need attention. It just gets worse with louder levels. If I had not been watching the input gain it might be a different story. I'm literally ready to throw that thing in the trash. At this point it sounds best not EQ'ing it at all. I can't even plug in the DSP without it wrecking the response.

Why on earth is it making that null way worse? Why is it dropping 30 db on the low bass?

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post #13 of 16 Old 03-11-16, 01:13 PM
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Re: help! MiniDSP causes big distortion on big bass hits

Looks like there are crossover filters active in the miniDSP for the output(s) you are using. There are several sections where filtering can be applied in the miniDSP plugin configuration so make sure you check them all.
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post #14 of 16 Old 03-11-16, 01:59 PM Thread Starter
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Re: help! MiniDSP causes big distortion on big bass hits

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JohnM wrote: View Post
Looks like there are crossover filters active in the miniDSP for the output(s) you are using.
Strange, I can't recall setting up such a thing and have no idea why I would.
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post #15 of 16 Old 03-11-16, 02:09 PM
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Re: help! MiniDSP causes big distortion on big bass hits

A crossover may be on by default depending on the type of plugin.
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post #16 of 16 Old 03-11-16, 09:53 PM Thread Starter
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Re: help! MiniDSP causes big distortion on big bass hits

There was a 1,000 hz low pass filter in place. Not sure why that would cause the null to be worse or for below 30 hz to look like a ski slope. Guess I'll play with it some more and see if it is correlated.
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