SPL and Screen Size Calcs - Home Theater Forum and Systems - HomeTheaterShack.com

Old 11-09-06, 01:42 PM Thread Starter
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Naut

Join Date: Apr 2006
Location: Richmond, VA
Posts: 606
SPL and Screen Size Calcs

Check out the cool calculators (and the little quiz) on this enthusiast's site.

Collins' Cinema

My SPL calc was good news. Looks like I can do reference level with no fear of clipping.

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Old 11-09-06, 02:38 PM
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Josuah

Join Date: Apr 2006
Location: San Jose, CA
Posts: 636
Re: SPL and Screen Size Calcs

Well, if the sound is only coming from one speaker (e.g. center channel) you have to take away 3dB. And if the sound is of a higher frequency, you have to take away another 3dB. Also, your speaker's sensitivity of 91.5dB@1W@1m may not be the actual value; I've seen many speakers that are 1-2dB lower than their spec'ed value.

:-S
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Old 11-09-06, 03:36 PM Thread Starter
Moderator Emeritus

Naut

Join Date: Apr 2006
Location: Richmond, VA
Posts: 606
Re: SPL and Screen Size Calcs

Yes, you are right those are some variables, and there are others.

I don't use a center channel. Stereophile measured the Ikon 6 at 90.5dB(B)/2.83V/m. The Denon's 115 W +115 W into two 6 ohms loads may be rated conservatively as Denon tends to do. The Ikons are a nominal 6 ohm load, but through much of their range its closer to 4.5 ohms. The higher frequencies are tipped up a bit.

Suffice it to say, that even though there are a lot of variables, I just wanted to point out that the SPL calculator is cool. Just plug in the specified values and interpret the result with a grain of salt.

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You will be assimilated. Resistance is futile.
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Old 11-10-06, 01:03 AM
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Josuah

Join Date: Apr 2006
Location: San Jose, CA
Posts: 636
Re: SPL and Screen Size Calcs

Yeah, I use it often too. Just for rough guesswork.
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