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#372795 - 04/10/12 07:11 PM Re: M80's [Re: Rustolem]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
Don't forget that 40hz crossover isn't a brick wall, the sub will be feed from about 55hz down until somwhere just below 40 none of the signal is sent to the mains.
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#372803 - 04/10/12 08:35 PM Re: M80's [Re: Rustolem]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 4220
Loc: Up yonder
Even if using an Outlaw ICBM? I have no idea, just asking cause the ICBM is getting analogue from the pre amp.
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#372804 - 04/10/12 08:40 PM Re: M80's [Re: Rustolem]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
I don't know for sure, I am unfamiliar with the ICBM, but I believe it would be hard to blend mains and sub if the crossover was a brick wall.
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Jason
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TTTHHHPPPPPTTTT!

My HT

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#372806 - 04/10/12 08:57 PM Re: M80's [Re: Rustolem]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 4220
Loc: Up yonder
Ya, I never really thought about it like that, but I agree with your reasoning. Heck, I just turn this stuff on and tweak it a little here and there.... And it either sounds good to me or it doesn't. I have too many other hobbies to get too far into the details and theory of audio.
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#372814 - 04/10/12 09:25 PM Re: M80's [Re: Rustolem]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6790
Loc: The Peoples Republic of Il.

The ICBM has to where you can pick between a 24DB or 36DB slope.
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"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#372822 - 04/10/12 10:29 PM Re: M80's [Re: michael_d]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10640
Yeah, Mike; the ICBM has a standard 2nd order 12dB/octave slope which you're likely using(there's an optional 36dB/octave setting for certain subs). Typical HT receivers use a 24dB/octave slope for the sub.

So, the point Jason mentions is valid: there's nothing unusual in the sub cone movement you observed with some music at very high listening levels. You're getting significant sub output to at least 70Hz with the 40Hz crossover. Some of the instruments used in alternative rock have their lowest fundamental around 40Hz; for example, a double bass(or the electric bass guitar usually used in rock groups)has its lowest fundamental at 41.2Hz. Kick drums are another example with outputs around 40-70Hz. At high levels those frequencies certainly move sub cones, and explain your observation.

Incidentally, if you want to hear how "musical" the lowest bass notes alone played by the sub are(not),keep the settings the same(or even select the 36dB/octave slope)and disconnect the speaker wires so that the sub alone is playing during these bass-heavy tracks.
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#372824 - 04/10/12 10:32 PM Re: M80's [Re: Rustolem]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6790
Loc: The Peoples Republic of Il.

It is a 12db then? It's been quite a while since I had one.
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Rick


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


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#372825 - 04/10/12 10:35 PM Re: M80's [Re: Wid]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10640
Yes.
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#372858 - 04/11/12 09:17 AM Re: M80's [Re: Rustolem]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 4220
Loc: Up yonder
What does "slope" mean? I've familiar with the term, but never took the time to learn what it means. And what's 2nd order? Can you either explain or point me somewhere that will describe this, audio for dummies style?
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#372875 - 04/11/12 10:48 AM Re: M80's [Re: michael_d]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
Mike, the slope refers to how "severe" the crossover's cutoff is, measured in decibels per octave. A 6dB/octave crossover reduces a signal more gradually than a 12dB/octave crossover -- which is twice as steep. This page has a graph that should make it clear:

http://www.bcae1.com/xovrslop.htm
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