Question on MiniDSP filters and stacking - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 4 Old 03-03-17, 02:53 AM Thread Starter
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hcanning
 
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Question on MiniDSP filters and stacking

Hi all,

I am having a lot of fun using my MiniDSP 2x4 to flatten the response of my sub! I just have a couple of questions.. I have a pretty serious peak to tame, as well as a far less serious but still correctable dip.

Is it going to cause any problems if I use two filters at the same frequency and bandwidth, one at -16db and the other 'stacked' to reduce by a further 4-5db, to achieve the desired cut on the peak? It obviously shows as desired in the MiniDSP plugin but I'm wondering if it'll cause any issues by going "out of spec" (more than -+16db) so to speak?

Also if I'm adding a boost of, say, 6-8db, and I'm looking at the input/output meters in the software whilst sending test tones, as long as there's no clipping showing in the meters (right into the red?) I'm OK and within the available headroom and shouldn't have any clipping/distortion, right?

Thanks!
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post #2 of 4 Old 03-03-17, 03:38 PM
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Re: Question on MiniDSP filters and stacking

Technically it’s not a problem stacking filters. However, I have idea how things work with the miniDSP. I suppose if there is a problem, it’ll b something you’ll hear.

Can’t definitively answer the question about clipping, as (again) I don’t have a miniDSP. If you’re confident that the output meter reflects the addition of filters, then as long as you keep it well out of the red you’re fine. I say "well out of the red" because you want plenty of headroom should you ever use a source with a hotter signal than the one you were using as a reference for your post.

Regards,
Wayne



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post #3 of 4 Old 03-04-17, 01:32 AM Thread Starter
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Re: Question on MiniDSP filters and stacking

Quote:
Wayne A. Pflughaupt wrote: View Post
Technically itís not a problem stacking filters. However, I have idea how things work with the miniDSP. I suppose if there is a problem, itíll b something youíll hear.

Canít definitively answer the question about clipping, as (again) I donít have a miniDSP. If youíre confident that the output meter reflects the addition of filters, then as long as you keep it well out of the red youíre fine. I say "well out of the red" because you want plenty of headroom should you ever use a source with a hotter signal than the one you were using as a reference for your post.

Regards,
Wayne
Thank you for your response Wayne. I guess my gut feelings were right. I'll have a play
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post #4 of 4 Old 03-04-17, 09:12 AM Thread Starter
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Re: Question on MiniDSP filters and stacking

After a morning of fiddling, here's my graph. I've been watching various clips to tweak the overall level, and just watched a full movie (Hacksaw Ridge, wow what a sound track) and it sounds impressive. There's no annoying boomy bass, just nice and deep and integrated nicely with the rest of the soundstage.



Edit: Purple is pre-calibration, but I guess that's obvious! I didn't want to go too mad boosting that null. I might even remove that filter completely and see if I can tell any difference. Unfortunately it wouldn't respond to moving the sub around in its immediate location and it's not really practical to put it anywhere else, so that's life!
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