Home Theater Forum and Systems - HomeTheaterShack.com - Reply to Topic

Thread: Gain Structure for Home Theater Discussion Thread Reply to Thread
Title:
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
04-01-19 08:24 PM
djcreative1
Quote:
Wayne A. Pflughaupt wrote: View Post
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!!!
03-29-19 05:50 PM
Wayne A. Pflughaupt
Re: Gain Structure for Home Theater Discussion Thread

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
03-28-19 02:46 AM
djcreative1
Quote:
Wayne A. Pflughaupt wrote: View Post
[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?
03-19-19 09:07 AM
Wayne A. Pflughaupt
Re: Gain Structure for Home Theater Discussion Thread

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

Regards,
Wayne
03-18-19 08:14 PM
djcreative1
Quote:
Wayne A. Pflughaupt wrote: View Post
[


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!
03-18-19 05:34 PM
Wayne A. Pflughaupt
Re: Gain Structure for Home Theater Discussion Thread

Quote:
djcreative1 wrote: View Post
I would like to go through my gain setting process with you just to make sure i have it right. I get the idea, you want your reciver and amp to clip at the same time.
Actually, your situation is outside the scope of the article. The article is based on the premise of using outboard pro-audio amplifiers for all channels.

What you’re basically doing is setting your subwoofer level. The common procedure for that, which you’ll find recommended at any home theater forum, is to adjust the subwoofer gain to get an in-room SPL measurement about 10 dB hotter than the main speakers, as a starting point. True, typically the sub in question is active, but it doesn’t change if your sub happens to have an outboard amplifier. An amp is an amp - makes no difference if it’s in or out of the sub box. And a gain control is a gain control.

At the end of the day, all that matters is: are you able to get all the volume you need out of the sub? If the answer is “no,” even with the receiver’s sub output maxed out, and the sub’s gain all the way up, then a new sub system in order. If the answer is “yes,” you’re good to go.

I’m sure you won’t be satisfied with that, so consider this. In your situation, a pro-audio-styled gain structure exercise is irrelevant because your receiver, despite Pioneer’s specs, probably puts out less than an honest 100 watts per channel, while your Crown amp puts out 1200 watts per channel with your 2-ohm load. IOW, by the time the Crown reaches clipping, the Pioneer will be having a melt-down because it can’t keep up.

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. Which means you’ll have to back down on the amplifier gain. Which means all you’ve ultimately done is blend the sub with the main speakers, just as I described in the second paragraph above.

Regards,
Wayne
03-18-19 02:34 PM
djcreative1 Np! One channel will be ran to two nvx vsw152v2's (sealed) 2.4 cu ft per chamber 25oz poly fill each 2 ohm load. The other is a cheap 15 in a ported box tuned to 37. I think is 4.6 cu ft. The sub is a plpw15d. 2 ohm load. I also use a mini dsp for the high pass filter on the ported sub.
03-18-19 01:16 PM
Wayne A. Pflughaupt
Re: Gain Structure for Home Theater Discussion Thread

Should have asked also (sorry!), what sub are you using?

Regards,
Wayne
03-18-19 12:53 PM
djcreative1
Quote:
Wayne A. Pflughaupt wrote: View Post
What speakers are you using for your main channels?

Regards,
Wayne
Mtx tp1200 for l,r
Then old pioneer satalite speakers that come with those 5.1 setups for c sl sr.
03-18-19 12:44 PM
Wayne A. Pflughaupt
Re: Gain Structure for Home Theater Discussion Thread

What speakers are you using for your main channels?

Regards,
Wayne
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!

 


For the best viewing experience please update your browser to Google Chrome