0dBFS + 10dB Handling in BFD And Pro Amps - AVS | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 
Thread Tools
Old 05-08-2013, 04:43 AM - Thread Starter
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Liked: 127
Can anyone explain how BFD and Pro Amps handle any signal gretaer than 0dBFS (105dB) when LFE is mixed 10dB hotter than normal signal? What confuses me is if mains are doing 105dB at dolby reference when the dynamic peaks kick in, LFE should be at 115dB in the recording mix of movie. So, if BFD and Pro Amps clip any signal that is greater than 105dB then how can subwoofers playback at insane SPL levels i.e. 120-130dB??

History is written by those who have hanged heroes ...

Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500
braveheart123 is offline  
Sponsored Links
Advertisement
 
Old 05-08-2013, 05:09 AM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 11,008
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 2002
Quote:
Originally Posted by braveheart123 View Post

if BFD and Pro Amps clip any signal that is greater than 105dB then how can subwoofers playback at insane SPL levels i.e. 120-130dB??
There's no direct correlation between the input sensitivity of an amp and the output level of the speakers. You're leaving out more than a few details, including, but not restricted to, the gain of the power amp and the sensitivity of the speakers.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is offline  
Old 05-08-2013, 05:37 AM - Thread Starter
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Liked: 127
The attenuators on the front panel of iNuke 6000 DSP are three clicks from the max position (Just below where the signal clips). Sub trim level in avr is at -7.5dB on the AVR (Denon 3313). The level matching between iNuke and AVR is done after running audyssey and setting 4 filters in BFD with 0dBFS 60hz test tone played back at 00 on master volume (AVR). Speaker sensitivity is 85dB with 1W/1m.

History is written by those who have hanged heroes ...

Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500
braveheart123 is offline  
Old 05-08-2013, 05:39 AM - Thread Starter
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Liked: 127
Dynamic EQ was disengaged but Audyssey was engaged when setting the gain for iNuke

History is written by those who have hanged heroes ...

Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500
braveheart123 is offline  
Old 05-08-2013, 09:49 AM - Thread Starter
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Liked: 127
Can anyone pls clarify this?

History is written by those who have hanged heroes ...

Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500
braveheart123 is offline  
Old 05-10-2013, 01:02 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 17,952
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked: 1489
your receiver can output more voltage than 0dbfs.

the pro amp takes whatever signal that you send it and amplifies it. many pro amps don't clip on the input until way past anything that your receiver could throw at it, something up around 10 volts or so.

if you have enough amp, it simply takes the input and amplifies it. if you don't have enough amp, then it will clip the signal during amplification.

not a whole lot to it.

Listen. It's All Good.
LTD02 is offline  
Old 05-10-2013, 11:38 AM - Thread Starter
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Liked: 127
Thanx LTD02

History is written by those who have hanged heroes ...

Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500
braveheart123 is offline  
 
Thread Tools


Forum Jump: 

Posting Rules  
You may not post new threads
You may not 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 code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off