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#402991 - 04/13/14 10:39 AM Re: Understanding Tech Specs on A/V Equipment [Re: AlaskanAVGuy]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1271
Loc: Quebec, Canada
Anyone of you children would like to review their Alphabet Basics with me ?
- Remember! we start with the letter A...then B...then it's letter D...
- ...and, we finish with the 4 letter word.


Edited by J. B. (04/13/14 10:40 AM)
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or: Axiom Gallery

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#403001 - 04/13/14 12:53 PM Re: Understanding Tech Specs on A/V Equipment [Re: AlaskanAVGuy]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1050
Not sure if that was directed at me but...
I noticed I had an issue sometime around ohms law. Up till then I did just fine, then equations started looking like alien giberish.
Its a shame really. I know it should be easy.I think it might be dyslexia related. Seems to be the only time its an issue.


Edited by brwsaw (04/13/14 01:29 PM)
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#403049 - 04/13/14 11:48 PM Re: Understanding Tech Specs on A/V Equipment [Re: AlaskanAVGuy]
Serenity_Now Offline
local

Registered: 03/28/14
Posts: 211
Loc: PEI, Canada
Hey brwsaw,

Someone check my math! grin

You can use an online calculator to find where your speakers will theoretically top out with spl within the rated output of your amp. Then add 3 db for every doubling of speakers playing simultaneosly.

Ie. 1 speaker 110db
2 speaker 113db
4 speaker 116db

Then you must subtract from this the decible drop from source distance. For this, each distance doubling drops 6db.


So if 1m is 110db
2m is 104db
4m is 98db. Etc.

Axiom specs the m80 in room at 92db@1w/1m. At 4m they should be around 80db.

So take 80@1w
83@2w
86@4w
89@8w
92@16w
95@32w
98@64w
101@128w
104@256w

Add 3db for a stereo pair.

All these numbers are purely theoretical. They depend on the listening axis, acoustic damping of the space, and listening material. We are also more sensitive to certain frequencies.

The best way for you to be happy is to listen to your source material in your space and ask how much more power does it really take to get to that next step? Probably lots according to the formulas.

Really, the only way to check this in a meaningful way is to play your reference material and measure peak and average levels with an spl meter. Buying a huge amp will add headroom and can make listening a more engaging and dynamic experience. The purpose is not to increase nominal listening levels, as your amp is likely already capable.

Nominal listening levels are nowhere near the 110db mentioned earlier. That dba is dangerous to hearing at sustained levels.

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#403055 - 04/14/14 01:16 AM Re: Understanding Tech Specs on A/V Equipment [Re: AlaskanAVGuy]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1050
That's pretty interesting. By that model the 1000 is perfect for this room. I was pretty sure it was. Thanks.
FWIW I watched the first 2 episodes of Band of Brothers in 3.0 and episodes 3 and 4 in 5.0 last night and at no time did the towers seem strained. I'm pretty impressed by how well they handle extreme jumps in SPL while remaining clear and detailed.
I still need to work on the room but these towers were everything I was hoping they would be.
The second amp may still happen but only if I upgrade from my RX-A1010 to a dedicated 9 or 11 channel pre/pro.


Edited by brwsaw (04/14/14 01:28 AM)
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#403065 - 04/14/14 09:13 AM Re: Understanding Tech Specs on A/V Equipment [Re: AlaskanAVGuy]
Serenity_Now Offline
local

Registered: 03/28/14
Posts: 211
Loc: PEI, Canada
The drop scene is really awesome for dynamics! smile

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