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#383215 - 09/23/12 10:38 PM Re: Real Newb Question [Re: Diamondog]
Boltron Offline
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Registered: 11/18/11
Posts: 166
Loc: Toronto
Actually John, the 50 watts you refer too, would that include the dynamics of the sound? Take a modern action movie with lossless multi-channel sound. The peaks can go well over 50 watts I would think, no?
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#383220 - 09/23/12 11:47 PM Re: Real Newb Question [Re: Boltron]
JohnK Online   content
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Registered: 05/11/02
Posts: 10306
No; as I stated, the 50 watts were for the max peak of 102dB. At more typical levels, about 1 watt is used.
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#383225 - 09/24/12 07:31 AM Re: Real Newb Question [Re: Diamondog]
Boltron Offline
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Registered: 11/18/11
Posts: 166
Loc: Toronto
Ah thank you, I misread. That's good info.
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#383631 - 10/03/12 09:54 PM Re: Real Newb Question [Re: JohnK]
AdrianD Offline
old hand

Registered: 01/09/12
Posts: 82
Loc: Maple, Ontario
Originally Posted By: JohnK
No; as I stated, the 50 watts were for the max peak of 102dB. At more typical levels, about 1 watt is used.


Quick question: I have 2 monoblocks (32 dB gain) rated at 350W RMS, and 2 M80 v3. I crank the volume on my prepro at half (I like it loud, what can I tell you grin); my SPL meter at 1 meter distance shows a peak of 98dB with music.
What am I missing? Either my math it's very bad, something is horribly wrong with my setup or my prepro outputs close to nothing.
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M80 v3, 2 x Emotiva UPA-1 Monoblocks, XPA-5, UMC-1 PrePro
Pro-Ject RPM Genie, Carver C2 Phono Preamp

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#383633 - 10/03/12 10:35 PM Re: Real Newb Question [Re: AdrianD]
JohnK Online   content
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Registered: 05/11/02
Posts: 10306
AD, I don't know why you suspect that you may be "missing" something; what you report is fairly typical. That 98dB peak uses 10 watts or a bit less for the M80s. The overall volume attained at specific volume level settings varies with the strength of the input from the source materials. Pre-amps typically have a gain(fixed, as is the amplifier gain)on the order of 15dB.
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#383651 - 10/04/12 07:36 AM Re: Real Newb Question [Re: JohnK]
AdrianD Offline
old hand

Registered: 01/09/12
Posts: 82
Loc: Maple, Ontario
Originally Posted By: JohnK
AD, I don't know why you suspect that you may be "missing" something; what you report is fairly typical. That 98dB peak uses 10 watts or a bit less for the M80s. The overall volume attained at specific volume level settings varies with the strength of the input from the source materials. Pre-amps typically have a gain(fixed, as is the amplifier gain)on the order of 15dB.

And right you are Sir; thinking about it a little bit, I remember sometime ago I did a little test. I plugged in my old Carver C2 preamp (which I now use as a phono amp only via my prepro) directly into the amps. The volume control knob has a scale from 1 to 10; at 3, it was MUCH louder then then half volume on the prepro. Needless to say, so was the noise.
So I dug up the specs on the Carver: MM Gain is 35 dB, while I suspect my prepro is in the range you suggested: around 15 dB.
Thank you!
_________________________
M80 v3, 2 x Emotiva UPA-1 Monoblocks, XPA-5, UMC-1 PrePro
Pro-Ject RPM Genie, Carver C2 Phono Preamp

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