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Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
Ken.C #247219 02/16/09 06:33 PM
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 Originally Posted By: kcarlile
Hi Dave, I'm in Oakland, but my audition times are pretty severely constrained, unless you can wait 3 weeks or so.


kcallile,
Thanks for the offer. But I sure hope I have already decided, ordered and have gotten (or awaiting factory outlet) speakers by then.


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
davekro #247229 02/16/09 06:53 PM
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Dave,

I'll jump in here just to reiterate my point I made over at AVS.... I'm not sure going 7.1 with the rears 16' away in a kitchen is the best idea. You won't loose much by going with 5.1.

Also, you are still hung up on the watts thing... Here is a neat calculator to show SPL from various watts/distances. Just plug in the specs from your amp, the speakers, and your room. According to some quick entries, you will be able to get over 100DB (way above reference) using the M60's with your AVR.

http://myhometheater.homestead.com/splcalculator.html

PS - Be sure to add to the watts entry and recalculate to see the effect....

Last edited by dewd; 02/16/09 06:55 PM.
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
davekro #247230 02/16/09 06:53 PM
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Dave I'm in south Florida and will be home during the early afternoons all week if you want to stop by for a listen?


Rick
Our Room

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Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
RickF #247235 02/16/09 07:02 PM
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 Originally Posted By: RickF
Dave I'm in south Florida and will be home during the early afternoons all week if you want to stop by for a listen?
.

Rick,
Though I appreciate the offer, I can only travel a 1+ hour drive. The five hour flight from Calif. is a bit of a stretch for me. ;\)


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
davekro #247239 02/16/09 07:09 PM
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Dave I thought so, I just wanted to let you know that we Floridians try our darnedest to be hospitable as well. \:D


Rick
Our Room

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Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
RickF #247240 02/16/09 07:32 PM
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davekro Offline OP
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 Originally Posted By: RickF
Dave I thought so, I just wanted to let you know that we Floridians try our darnedest to be hospitable as well. \:D



Rick I appreciate your 'hospitableness'. In Florida does 'hospitableness' include free air fair (and maybe even a per diem)! \:D


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
davekro #247243 02/16/09 07:41 PM
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Dave you shouldn't worry about having the fronts dominate. Your receiver should have the ability to individually adjust the speakers, giving you the ability to turn the fronts down or the rears up to compensate and balance the levels of all speakers, which is best to do anyhow


Steve
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
dewd #247244 02/16/09 08:30 PM
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 Originally Posted By: dewd
Dave,
Just plug in the specs from your amp, the speakers, and your room. According to some quick entries, you will be able to get over 100DB (way above reference) using the M60's with your AVR.
http://myhometheater.homestead.com/splcalculator.html
PS - Be sure to add to the watts entry and recalculate to see the effect....


I claim tech ignorance on this, but are you sure that calc is right in real world terms. It basically says 20 watts reaches 104 dB. . . I'd like to see that if we are talking about real musical notes from 20 to 20. I know the whole "power doesn't matter" thing is a well settled debate here, but 20 v. 250 yields little change with 93 db speakers. If this is right, you could power an ep800 with a 20 watt amp, yet all compaines are pushing well over 500???
I don't know, sounds fishy.


Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
dewd #247245 02/16/09 08:33 PM
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davekro Offline OP
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 Originally Posted By: dewd
Dave, Here is a neat calculator to show SPL from various watts/distances. Just plug in the specs from your amp, the speakers, and your room. According to some quick entries, you will be able to get over 100DB (way above reference) using the M60's with your AVR.

http://myhometheater.homestead.com/splcalculator.html

PS - Be sure to add to the watts entry and recalculate to see the effect....


Dewd,
Thanks for the calculator. I ran across it a few days ago and forgot to back and 'use it'. ;o)
That said, I do not understand what these terms translate too:
1) dB gain from amplifier?
(going from 90wpc to 130wpc only raises this from 19.5 to 21.1dB)

2) dB Loss due to dispersion (distance)?
(Using 12' dist. this remains constant at -11.3dB)

3) dB Gain from sonic reinforcement (multi speakers)?
(constant at 8.5dB)

I get your point on the Sound Pressure Level changing from 109.7db @ 90wpc to 111.3dB @ 130dB. I assume this means my 90 wpc amp has headroom above what I might listen to a loud action movie at.

In their calculator, all the above is based on avg 8ohm imped. The other power hang up ;o) I have had was that my 1909 could not handle the 4ohm M80's. The 1909's specs read:
6 - 16 ohms
90 wpc (8ohms, 20Hz-20kHz, with .08%THD)
120 wpc (6ohms, 1kHz with .7%THD)
I'm not sure but I think these specs say THD increases almost 9 fold when dropping to just 6ohms. I assume distortion increase would even much worse if the 1909 saw a 4ohm load, not to mention a 4 ohm load being detrimental to the 1909. Do I have this correct.
tks


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Ideas on 31'L x 23'W room for fronts, 7.1 back
davekro #247247 02/16/09 08:38 PM
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I would never pass up a chance to meet the Rickster. \:\)


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


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