0dBFS + 10dB Handling in BFD And Pro Amps - AVS Forum
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post #1 of 7 Old 05-08-2013, 04:43 AM - Thread Starter
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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??

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post #2 of 7 Old 05-08-2013, 05:09 AM
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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.

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post #3 of 7 Old 05-08-2013, 05:37 AM - Thread Starter
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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.

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post #4 of 7 Old 05-08-2013, 05:39 AM - Thread Starter
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Dynamic EQ was disengaged but Audyssey was engaged when setting the gain for iNuke

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post #5 of 7 Old 05-08-2013, 09:49 AM - Thread Starter
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Can anyone pls clarify this?

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post #6 of 7 Old 05-10-2013, 01:02 AM
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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.

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post #7 of 7 Old 05-10-2013, 11:38 AM - Thread Starter
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Thanx LTD02

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