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Re: M80's with Outlaw RR 2150 receiver
Robert_W #158993 02/18/07 06:23 PM
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Quote:

with another dip of 3db or so at 120-150db or so.




Ian has explained this dip before.

"In reference to the little dip and rise at 150 Hz in the M80 compared to the M60; it is just the microphone positioning being up right under the tweeter and only 2 meters back in the anechoic chamber giving it an increased angle of attack on the very tall M80s."

Quote:

We can see that beginning at 60hz and down the M80’s are already off by 3db




This too has been explained.

"The chamber is accurate to 85 Hz and then there is a correction applied below that. For heightened accuracy of measurements below 85 Hz we measure out on our pole in mid air. The pole puts the product and microphone up about 20 feet in the air. The sub graphs above are from the pole. You can see in the NRC graph above of the M60 the bass rolls off quickly below 37 Hz and this trend lines up with the pole measurements of the bass response of an M60, hence the 37 Hz spec."

Peak SPL calculator


Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud

Re: M80's with Outlaw RR 2150 receiver
Wid #158994 02/19/07 12:35 AM
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I am planning on crossing over my M80's at 60 Hz. My room has a resonant peak at about 63 Hz. I use a dbx 31 dual channel 31 band graphic equalizer to tame this peak. The Outlaw RR 2150 has a bass management selector switch which allows the cross over to be at 60,80, and 100.

I now have JBL S38 speakers which work fine with the 60 Hz crossover point and the dbx equalizer.

Re: M80's with Outlaw RR 2150 receiver
SirQuack #158995 02/19/07 07:26 AM
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sir: I can NOT imagine listening at those sound levels!!!!!!

Of course, if we are talking about peak power, then, maybe, that factor of 20 -25 between peak and average may enter into the picture.


The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV
Re: M80's with Outlaw RR 2150 receiver
ratpack #158996 02/19/07 05:29 PM
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I didn't get the impression that he was listening at those levels, but rather the computed theoretical max SPL of a single M80 (at 95dB / 1W per meter) driven with 100 and 500 Watts. Add another M80 for the pair gives another 3dB.


-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/
Re: M80's with Outlaw RR 2150 receiver
Robert_W #158997 02/19/07 06:27 PM
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Quote:

The room they are in is roughly 14,000 sqf and it gets filled up fine.




That room is larger than my whole house ... and yard!


Rick
Our Room

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Re: M80's with Outlaw RR 2150 receiver
RickF #158998 02/19/07 07:39 PM
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Quote:

Quote:

The room they are in is roughly 14,000 sqf and it gets filled up fine.




That room is larger than my whole house ... and yard!




Oops....Sorry, should have said CUBIC feet....my bad, 32' x 36' with an average 12' ceiling. I type faster than my brain can keep up with some times.....or is it the other way around.

Re: M80's with Outlaw RR 2150 receiver
Robert_W #158999 02/19/07 07:58 PM
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I was also wondering about your house. Your room should be great for music. In our great room, where the M80's are going, recordings of pipe organ really sound nice with room for the low pedal notes to breath.

I find that in my case different kinds of music sound better on different sound systems. My favorite for lots of my listening is still my pair of Carver Platinum Amazing speakers. I really like the dipole sound. They have served me well for over 20 years.

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