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#209393 - 05/26/08 10:52 PM Re: Fred's Setup Thread [Re: Ken.C]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
Hrmpf!! Fine for you maybe, but us Germans have this thing about Swiss precision.


Edited by fredk (05/26/08 10:52 PM)
_________________________
Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#209394 - 05/26/08 10:56 PM Re: Fred's Setup Thread [Re: fredk]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17739
Loc: NoVA
Heh... I'm just saying that having a sound meter is better than not having one at all, even if it may be inaccurate at lower frequencies.
_________________________
I didn't do it, no one saw me, you can't prove anything.

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#209416 - 05/27/08 01:57 AM Re: Fred's Setup Thread [Re: Ken.C]
doormat Offline
devotee

Registered: 10/28/07
Posts: 395
Loc: Cold Lake, AB
Sonicboom still carries the RS meter up here:
RS analog meter
_________________________
M80s/VP160/QS8s/EP350; M22s; M3s.

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#209419 - 05/27/08 02:32 AM Re: Fred's Setup Thread [Re: doormat]
honkongphooey Offline
regular

Registered: 05/27/08
Posts: 5
Loc: West Vancouver, BC, Canada
That AVIA + SPL combo deal at Sonicboom for $99 is a pretty fair deal when considering I just bought a new Avia II DVD and a used Radio Shack SPL off Ebay for $83 combined (shipping included).
_________________________
"It's a nocturne. You know, Frederic f**king Chopin?" John Henry (Doc) Holliday

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#209424 - 05/27/08 05:15 AM Re: Fred's Setup Thread [Re: honkongphooey]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
Thanks Doormat, I had forgotten about them. I already have the DVE disk, so I don't need AVIA.
_________________________
Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#209428 - 05/27/08 05:54 AM Re: Fred's Setup Thread [Re: fredk]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
I don't have the RS meter, I bought one from an electronics shop in town. link It seems to work very well.
_________________________
Jason
-----------------
TTTHHHPPPPPTTTT!

My HT

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#209440 - 05/27/08 10:14 AM Re: Fred's Setup Thread [Re: fredk]
Nick B Offline
devotee

Registered: 08/05/06
Posts: 491
What you want for your sub is this.

http://www.rivesaudio.com/software/TestCD.html

This cd has test tracks that are corrected for the radio shack slp meter. So it is accurate below 100 Hz unlike the other suggestions. Track 32 to 40 are the important ones to find the best location for your sub. Those tracks have the corrected 20, 25, 31.5, 40, 50 63 80 100 and 125 Hz test tones. So here is what you do: Set your sub crossover to bypass and your receiver crossover to 80 Hz. Find the 3 or 4 different locations that you want to put the sub and run the tone tests with the rives cd from tracks 32 to 40. You want to run the test tones with the phase at 0 and then 180 degrees in each location. Keep a chart of all of this information. The best location and phase will be the one with the flattest frequency response. Since you are getting full range speakers (m60's or m80's) you could also test each location and phase with different crossovers for the front speakers as well, but only if your receiver allows for the mains to be crossed differently that the center and surrounds. For example in the first location run the test tones with 40Hz, 50Hz, 60Hz, 70Hz and 80Hz each with 0 and 180 deg on the phase setting. So that is a total of 10 runs that you have recorded in your chart for the first location. Repeat this with each possible sub location and pick out which location has the flattest frequency response in your range.

For my room I ran the tone tests for about 3 or 4 locations and it turned out that 80Hz worked out best for the crossover with my m22's. I tried 60 and 70Hz as well but the frequency response was a huge mess. The phase makes a huge difference when trying to match your mains to the sub. In one phase setting my frequency response was +/- 8 dB from 25 Hz to 160 Hz and with the other phase setting it is +/- 2dB. That is what my in room response is right now. You can't get much better that than since the tolerance on the Outlaw sub is only +/- 2dB. So all this work is definitely worth the effort.

- Nick

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#209444 - 05/27/08 10:33 AM Re: Fred's Setup Thread [Re: Nick B]
Nick B Offline
devotee

Registered: 08/05/06
Posts: 491
I forgot to mention that the rives test cd has corrected tracks for the radio shack meter from 20Hz up to 20,000Hz if you want to see what your in room frequency response is. Those are tracks 32 to 62 on the cd. Yes you are taking only 30 measurements from 20 to 20,000 Hz, but they are accurate and will at least give you an idea of how much your room is causing problems.

- Nick

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#209490 - 05/27/08 02:33 PM Re: Fred's Setup Thread [Re: Nick B]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
Hmm, that second part about corrected up to 20,000 Hz, got my attention. Combined with REW to automate the data collection it could be interesting.

After all the stuff I have read about room effects and correction, I am curious to know what my room will do to the response of the M80s.
_________________________
Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#209520 - 05/27/08 04:09 PM Re: Fred's Setup Thread [Re: fredk]
Karlman Offline
enthusiast

Registered: 05/07/08
Posts: 33
Loc: Manitoba, Canada
Wow.. and I thought I could just unpack my speakers today, lay some cable, and I'd be good to go \:\(

Man.. I didn't realize what I was getting into when I thought 'Geez.. some speakers would be really nice down here.'
_________________________
Gene

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