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M100 max spl
#427379 12/09/17 02:10 PM
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What is the max spl of the 6.5" hp drivers before they hit excursion limits?

Re: M100 max spl
AAAA #427383 12/09/17 03:42 PM
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axiomite
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The quest for speakers with no Minimum Safe Distance smile


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
Re: M100 max spl
AAAA #427387 12/09/17 05:31 PM
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Just trying to figure out how much output is possible on them before destruction.

Starting to think about how mechanical vs raw spl output weighs up against perceived loudness when room treatments reduce energy.

Trying to figure out the opportunity cost of bringing the room in line with taget decay times at the expense of net system sound power. It is cheaper to create perceived loudness/dynamics by damping a rooms energy, but is it at the cost of limiting the ability to properly reach reference? ie. making it physically impossible to reach undistorted 105db at the mlp with consumer level gear?

Apparently my speakers were tested to 115db before self destructing at 117db by the designers. The ribbon tweeter failed. At 115db/1m I should be able to hit 105 at the mlp. Im not sure its actually possible though. The math says yes but barely.... I dont think they can.


Re: M100 max spl
AAAA #427390 12/09/17 09:58 PM
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I remember Ian telling us at the two anniversary events I attended - 30th and 35th - that the torture chamber has several kilowatts of power, and some drivers do withstand that.

I also have pictures from the chamber of drivers that do not...complete destruction!


Regards,

Mike
Re: M100 max spl
BBIBH #427394 12/10/17 04:44 AM
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The max SPL of a speaker is a tough question to answer. Let's discuss this free space at one meter.

At 200 Hz and up, a single M100 will deliver 120 dB. As you go below 200 Hz, delivering high SPL becomes more difficult. But the triple 6.5's in an M100 should still do in excess of 110 dB at the 80 Hz crossover level.

What most don't understand is 110 dB will drive you from the room, and 120 dB will cause hearing damage fairly quickly.

Then add into the mix the room gain, and a pair of speakers, and I cannot imagine a scenario in a home in which a pair of M100's would not be able to generate 115 dB at the listening position from 80 Hz and up.

Back to "driving you from the room" ... in our blind tests here, I have run a 90 dB sine wave (measured from the listening position) and asked people to guess the SPL. It was so loud the lowest guess was 100 dB. The average guess was 107-108 dB.

Does this help answer the question?

Re: M100 max spl
AAAA #427400 12/10/17 07:46 AM
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There is another consideration we take into account when designing our drivers and that is; what happens when they do reach full excursion? The trick here is to be able to have this happen without blowing the driver or experiencing any popping or other ugly sounds.


Ian Colquhoun
President & Chief Engineer
Re: M100 max spl
AAAA #427402 12/10/17 01:53 PM
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Hey Craig, what weighting are you using? A or C?

It just occured to me I use A weighting for absolute levels. Flat or Z weighting for response. I will have to report back on this. We were probably well above dbC reference level.

Re: M100 max spl
AAAA #427403 12/10/17 02:48 PM
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I just checked we were 3db above 85dbC pink noise reference. When I turned it down 3db we were out of pop territory. The new governor is set at exactly 85dbC pink noise ref.

It takes a lot of speaker to make reference happen in this room. Lol. I barely get there before trouble with dynamic peaks. Food for thought when people go throwing around the term.....

Re: M100 max spl
AAAA #427406 12/11/17 01:34 AM
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The measurements were with Omni Mic and weighting was "C".

Ian made a solid point regarding what happens when nearing the excursion limits. One of the best things about Axiom/Bryston speakers is they can deliver excellent resolution at low levels while never getting strident at high levels.

Whether it is a subwoofer or a speaker, it's hard to make a Colquhoun Labs speaker sound bad.

Re: M100 max spl
AAAA #427407 12/11/17 01:44 AM
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The secret sauce is in the white dust cap.


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