Not sure where you looked. Even the old VU meters went from -20 to +3. Midi has 7 bits for "Velocity." Should I send you a VU meter?
Bill, Thousands? You underestimated that!
It was only on live symphonies in outdoor concerts that I found at 30 dB of headroom I could not hear any occasions of clipping.
A crest factor of 20dB with CD classic music is not that rare.
But 30dB is unrealistic for recorded music. Anything above 24-25dB is too much.
20dB crest factor can be 1 to 100W but only for the lucky guys with no neighbors around.
For the rest it is probably 0.1W to 32W
George
But 30dB is unrealistic for recorded music. Anything above 24-25dB is too much.
20dB crest factor can be 1 to 100W but only for the lucky guys with no neighbors around.
For the rest it is probably 0.1W to 32W
George
🙂 exactly. With 50+50W on each speaker plus 350W for the Sub I will have more than enough power to do what I need.
Ed,
I didn't look through the whole thing (90k entries), but this was the highest I saw in when I sorted them on peak DR and went through a bunch of ones that seemed very spurious:
Album details - Dynamic Range Database
1 W nominal is pretty dang loud (or REALLY low sensitivity speakers) in a home environment. Very few recordings are pushing 20 dB peak:nominal. I thought only the rarest of symphonic pieces get above 30 dB peak:nominal.
SY -- 10W peak may run into *some* situations where it'd clip, but only on challenging tracks and folks who like it loud. I still agree that effortless is an specious quality between a 10 and 100 W amp.
I have a few at that level, but I am not sure how much I trust the DR calculator. Certainly most good classical recordings hovver around -25dBFS, but watching the VU meter on foobar they all nudge up to -12 on the peaks. I keep hunting though.
Yeah, and referencing to thx is probably the best we can do, but 85db nominal seems high for home consumption.
Pano's voltage survey suggests that not too many folk need huge power either. Yes, your 1 ohm watt puppies may not apply.
Pano's voltage survey suggests that not too many folk need huge power either. Yes, your 1 ohm watt puppies may not apply.
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Yeah I reckon 75dB (which is the other recommended level) is probably more sane, but wanted to use the upper number for the example.
I just use the Mk1 eyeball. Good enough to find things that I might want to analyse more deeply in audacity.
Well if you want to talk about listening level my spl-c weighted slow level runs around 40 dB for most of my personal listening.
From experience 30 dB above the ambient noise level begins to be a comfortable level. However in sound reinforcement the minimum level needs to be around 70 dB. Run the system below that and watch audience heads nod. Raise the level and the heads bob back up. Really interesting to watch. For outdoor events other than popular music concerts less than 90 dBa and folks complain. More than 95 dBa and other folks complain. Now in one college stadium if you turn it up the alumni section complains. Turn it down and the student section complains.
Now as to headphones, believe it or not they rarely are 8 ohms. So converting advertised watts into sound pressure level is very very difficult to do over the internet.
So with a speaker that is 86db@1 watt @4 ohms I would assume that the 140 watt @ 1% distortion rating of the TPA3251 in bptl mode would satisfy the majority of listeners in a home environment. Would there be any real advantage to running two of these chips in parallel with one inverted and using them in a push/pull configuration?
I think an effort to keep that tpa3251 well fed power supply wise would do better than remotely worrying about bridge-parallel.
PS, the 140 into 4 ohms is in bridged form.
PS, the 140 into 4 ohms is in bridged form.
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I ask again. Sighted or unsighted? Enough golden ears love low watt tube amps to suggest that the brain is more important than the ears here. I would head over to the tube threads and try and convince the SET builders how wrong they are based on it being evident to you 🙂
Dan,
Yes I see that in the BPTL configuration it is 155watts@4 ohms @ 1% distortion. There are some very explicit design requirements for the power supply. I am thinking of a smps as the source of the power for all the electronics inside the speaker. A linear supply will just be to large and take either a large external enclosure or take up to much room internally.
Yes I see that in the BPTL configuration it is 155watts@4 ohms @ 1% distortion. There are some very explicit design requirements for the power supply. I am thinking of a smps as the source of the power for all the electronics inside the speaker. A linear supply will just be to large and take either a large external enclosure or take up to much room internally.
Yes, smps seems a must in your application. I apologize for speed reading your first post wrt pbtl.
Think most ears will give out before you hit the range where that chip starts increasing distortion markedly. 🙂
Think most ears will give out before you hit the range where that chip starts increasing distortion markedly. 🙂
I would say unsighted since it seemed so obvious,
but will admit to never trying an A / B that way ....
Since it was so obvious .....
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