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#338571 - 02/15/11 02:35 PM Re: 3dB frequency point of my M3's? [Re: CatBrat]
Emzdogz Offline
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Registered: 10/30/09
Posts: 110
I have to confess not seeing anything on the graph that corresponds with what has been posted.... but then I don't really know what I'm looking at, exactly.
The thing is the frequency knob on my sub only controls the sub.
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Tampa, FL

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#338572 - 02/15/11 02:37 PM Re: 3dB frequency point of my M3's? [Re: CatBrat]
Wid Offline
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Registered: 06/22/03
Posts: 6790
Loc: The Peoples Republic of Il.
The specs for the M3 is -3db at 60HZ. I would set the sub at 80HZ, that should be a pretty good spot for the setting.


Edited by wid (02/15/11 02:43 PM)
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"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#338575 - 02/15/11 02:45 PM Re: 3dB frequency point of my M3's? [Re: Wid]
ClubNeon Offline
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Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
Using the control on a subwoofer makes it a lot harder to have a smooth transition from the mains to the sub, than it is when using a receiver's crossover setting.

Most of the time the sub's control is a low-pass filter, and not an actual crossover (a crossover being a low-pass paired with a high-pass).

I find it much easier to set up the subwoofer, by totally disregarding the numbers, and doing it by ear (or SPL meter). You'll need to find a low frequency sweep sound. Play that on a loop. Start with the subwoofer's filter setting rather low. There should be a dropout in sound pressure level between the filter point and where the main speakers take over. Gradually raise the setting on the sub until you get a smooth frequency response through the whole transition range. That's where it should be set regardless of what the number says.
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Sony PS4, surround backs
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#338577 - 02/15/11 02:50 PM Re: 3dB frequency point of my M3's? [Re: ClubNeon]
Emzdogz Offline
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Registered: 10/30/09
Posts: 110
Originally Posted By: ClubNeon
Using the control on a subwoofer makes it a lot harder to have a smooth transition from the mains to the sub, than it is when using a receiver's crossover setting.

Most of the time the sub's control is a low-pass filter, and not an actual crossover (a crossover being a low-pass paired with a high-pass).

I find it much easier to set up the subwoofer, by totally disregarding the numbers, and doing it by ear (or SPL meter). You'll need to find a low frequency sweep sound. Play that on a loop. Start with the subwoofer's filter setting rather low. There should be a dropout in sound pressure level between the filter point and where the main speakers take over. Gradually raise the setting on the sub until you get a smooth frequency response through the whole transition range. That's where it should be set regardless of what the number says.


When you say "the receiver's crossover setting".... you mean the tone control? i.e. "bass" knob? (I'm using a very vintage receiver btw..)

thx
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Aunty Em
Tampa, FL

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#338578 - 02/15/11 02:52 PM Re: 3dB frequency point of my M3's? [Re: Emzdogz]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
Yeah, if you're using a vintage receiver, you won't have a crossover in it.
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#338579 - 02/15/11 02:54 PM Re: 3dB frequency point of my M3's? [Re: Ken.C]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 11445
Loc: Central NH
Em, newer receivers split out the bass frequencies and send it out to a "Subwoofer Out" jack on the back...

You have control at which frequency this split happens in a receiver.
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#338580 - 02/15/11 02:56 PM Re: 3dB frequency point of my M3's? [Re: Ken.C]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
You were doing it the only way you can. The knob on the subwoofer that is probably labeled Crossover (even if it isn't technically that).

Oh, the volume of the subwoofer should also be set when the filter point is low, so the output of the sub, and the output of the main speakers is equal. So when you start to raise the filter frequency the two will meet at equal levels.
_________________________
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris

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#338581 - 02/15/11 02:57 PM Re: 3dB frequency point of my M3's? [Re: ClubNeon]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
What subwoofer model do you have, by the way?
_________________________
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris

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#338613 - 02/15/11 06:41 PM Re: 3dB frequency point of my M3's? [Re: ClubNeon]
Emzdogz Offline
veteran

Registered: 10/30/09
Posts: 110
it is an Infinity SSW 10.
$$ extremely limited at the moment...someday I'll buy one from Axiom. Actually, I glad I got the M3's when I did.
But this sub isn't bad by any means...its just I have not much control over the whole deal.
I got to wondering about the whole thing while trying to decide whether to even use the sub for turntable listening or not.
We'll see! lots to think about and the music is sounding good!
smile
again, thanks to all who piped up with info.
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Aunty Em
Tampa, FL

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#338614 - 02/15/11 06:46 PM Re: 3dB frequency point of my M3's? [Re: Emzdogz]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 11445
Loc: Central NH
Does your receiver have an infrasonic or rumble switch?

No gang references, Bob! smile
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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