Gain Structure for Home Theater Discussion Thread

13480 Views 85 Replies 22 Participants Last post by Maxino1969, Dec 12, 2019

Wayne A. Pflughaupt

Discussion Starter · Nov 4, 2010

Please use this thread for any comments or discussion about my article Gain Structure for Home Theater.

Regards,
Wayne

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djcreative1

· #81 · Mar 19, 2019

Wayne A. Pflughaupt said:
[

So, you can do the max-level procedure you mentioned, at +15 or 0 (your choice), but what you’re probably going to find is that the sub ends up exceeding loud compared to the main speakers.

Perfect!!! As long as theres no damage to my subs or im not sending them a dirty signal id prefer it to be bass heavy. Hell im purposly picking out bass heavy movies just to hear my subs. Im sure ill want better sq later in life but for now all i wanna do is BUMP!!!

Just to be perfectly clear the "max level procedure" your talking about is the one i mentioned to you right?

Im soo excited!!! Thanks for your time and info!

Btw i call you "young wayne" in my head. Lil wayne refers to himself as that in a song and i think of it everytime you reply! Haha peace!

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Wayne A. Pflughaupt

Discussion Starter · #82 · Mar 19, 2019

Just to be perfectly clear the "max level procedure" your talking about is the one i mentioned to you right?

Yes indeed. :T

Regards,
Wayne

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djcreative1

· #83 · Mar 28, 2019

Wayne A. Pflughaupt said:
[quo

Say wayne, what if your speakers (left right) on your avr clip at a lower volume than your subwoofer pre out? Would you set your external amp (for subwoofer) gain according to the safe volume before speakers on the avr clip ( since you wont go past that volume anyway) or the safe volume before the avr's subwoofer pre out clips? I dont know if my speakers clip at a lower volume than my pre out im only asking because i know its the case for most car audio head units. I wont know till the first when my oscope comes in if its the case for me. Either way, whats the correct answer?

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Wayne A. Pflughaupt

Discussion Starter · #84 · Mar 29, 2019

If the mains distort before the sub amp clips, then the sub system obviously has more power than the mains. As such, there’s no gain structure requirement because you’ll never drive the sub amp into clipping in normal use, or even in “abusive use” where you were intentionally driving the mains to distort. So simply adjust the receiver’s sub output and the sub’s gain knobs appropriately to match and blend with the main speakers.

Regards,
Wayne

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djcreative1

· #85 · Apr 2, 2019

Wayne A. Pflughaupt said:
If the mains distort before the sub amp clips, then the sub system obviously has more power than the mains. As such, there’s no gain structure requirement because you’ll never drive the sub amp into clipping in normal use, or even in “abusive use” where you were intentionally driving the mains to distort. So simply adjust the receiver’s sub output and the sub’s gain knobs appropriately to match and blend with the main speakers.

Regards,
Wayne

Ok. Got my oscope in today. As expected my right left speaker terminals on my receiver clip at volume 64/80 and the sub out 73/80. So to be clear i would set my external subwoofer amplifier's gain with the safe volume of 63 not 72 correct?

Btw for anyone googling when the pioneer vsx-519v-k receiver clips it is @ volume 64/80 for left and right speaker terminals and 73/80 for subwoofer out.

Thanks a"gain" wayne!!!

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Maxino1969

· #86 · Dec 12, 2019

I bought the minidsp 2x4hd to equalize my 3 sub woofers in my home Theater, by specifications the minidsp has for the analogue input a jumper that set 2vrms (defaul) or 4 Vrms, All 4 output from the minidsp to the subwoofer are fixed at 2vrms . I measured the sub output of my avr denon 3500h and found to be 3.2vrms (0 Master Volume, 0 trim sub on avr, REW 0db on HDMI-channel 4, No Audyssey). my stupid questions are:

Do I have to set the jumper on the minidsp to 4Vrms or should / can leave it at 2Vrms. Which is the best option?
In both cases, what should I set on the Avr and / or minidsp? If I leave 2vrms I should have clipping of the signal when the avr sends more than 2v .. if I set 4Vrms on the minidsp, I should have more attenuation of the signal.. and then increase the trim on the subs? I'm going crazy and I don't even know if I should worry about it! One thing that I understand, is putting the minidsp in the chain the volumes of the sub woofers are lowered (i didn't misuse yet but approximately from 2v to 4v about 6db..and from no minidsp to minidsp..much more!).

Can you suggest me how to set the best ... Thanks a lot of the time that you lose reading my post.

My configuration is :
avr sub out 1 -> minidsp 2X4HD input 1 -> 3 subwoofer out.
Thanks.

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