Changing spacing of drivers on adire bang

dvdwmth · 8th September 2004, 03:55 PM

Can the woofers in the Adire bang be moved abit further apart to accommodate the tweeter closer to the centre and narrow the baffle. If I understand correctly The spacing of the woofer affects how high they can be crossed over and I think there is a risk of lobing if they are too far apart.

They will still be pretty tight, like the spacing in the adire kit281 for instance ( http://www.adireaudio.com/Files/AX-KIT281Review.pdf ), so I would guess that the crossover point is the only real concern.

Here are the plans for the Bang

http://www.adireaudio.com/TextPages/...eFrameText.htm

bobhayes · 8th September 2004, 04:27 PM

Looking at the roll off of the crossover in the review, I shouldn't think that the lobeing problem you anticipate should be much of an issue, however, a small apparent increase in the treble response might be encountered by moving it to the centre of the baffle. I thought it was generally good practice to place the drivers off centre to spread the baffle step effect (Frequencies with a wavelength less than the distance to the edge of the baffle are firing into full space rather than half space causing upto 6dB drop in sensitivity) but mainly in the midrange.
Are you using a different tweeter than the kit? If not I would follow the plans.
Don't take my comments as gospel as I'm no pro!

dvdwmth · 8th September 2004, 05:57 PM

I wasn't thinking of moving it quite as far as the center. It would still be positioned on the baffle according to golden ration proportions but the baffle would be slightly more narrow.

Ah what the heck... It was pretty much only an aesthetic issue anyway. My intention was to narrow the baffle for a slimmer cabinet, but there not that bad size wise. I imagine that if there is any baffle step compensation I'd be screwing that up. Guess I'll take the prudent route and stick to the plans. I can always experiment once I have the original as a reference point.

That said, if anyone else has any thoughts on this I'd still like to hear them for educations sake.

Thanks

Bill Fitzpatrick · 9th September 2004, 12:38 AM

Do you already have the woofers for the Bang? I followed the link and it calls for the MCM 55-1170 woofer which is not in stock and has a 100 day lead time which means to me, forget about it.

dvdwmth · 9th September 2004, 02:20 AM

Oh Damn. No I dont. I just wanted an efficient cheap speaker to experiment with that didn't use a full range driver since I just did two of those and its hard to get much cheaper than the bang. Guess Ill do a D3 then. I was going to get to those dayton drivers sooner or later. Im really itching to try them in the TL Dave... forgot his last name...Brown maybe... designed.

Anyway, if anyone else is wondering about this driver placement thing, adire replied to my email on the subject as follows:

The woofers are kept as close together as possible to keep the dispersion even; moving them further apart will hurt the off-axis power response of the speaker, and is not recommended.

So there you have it.

8th September 2004, 03:55 PM	#1
dvdwmth diyAudio Member Join Date: Apr 2004 Location: Toronto	Changing spacing of drivers on adire bang Can the woofers in the Adire bang be moved abit further apart to accommodate the tweeter closer to the centre and narrow the baffle. If I understand correctly The spacing of the woofer affects how high they can be crossed over and I think there is a risk of lobing if they are too far apart. They will still be pretty tight, like the spacing in the adire kit281 for instance ( http://www.adireaudio.com/Files/AX-KIT281Review.pdf ), so I would guess that the crossover point is the only real concern. Here are the plans for the Bang http://www.adireaudio.com/TextPages/...eFrameText.htm

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8th September 2004, 04:27 PM	#2
bobhayes diyAudio Member Join Date: Sep 2004 Location: Bungawalbyn, NSW	Looking at the roll off of the crossover in the review, I shouldn't think that the lobeing problem you anticipate should be much of an issue, however, a small apparent increase in the treble response might be encountered by moving it to the centre of the baffle. I thought it was generally good practice to place the drivers off centre to spread the baffle step effect (Frequencies with a wavelength less than the distance to the edge of the baffle are firing into full space rather than half space causing upto 6dB drop in sensitivity) but mainly in the midrange. Are you using a different tweeter than the kit? If not I would follow the plans. Don't take my comments as gospel as I'm no pro!

8th September 2004, 05:57 PM	#3
dvdwmth diyAudio Member Join Date: Apr 2004 Location: Toronto	I wasn't thinking of moving it quite as far as the center. It would still be positioned on the baffle according to golden ration proportions but the baffle would be slightly more narrow. Ah what the heck... It was pretty much only an aesthetic issue anyway. My intention was to narrow the baffle for a slimmer cabinet, but there not that bad size wise. I imagine that if there is any baffle step compensation I'd be screwing that up. Guess I'll take the prudent route and stick to the plans. I can always experiment once I have the original as a reference point. That said, if anyone else has any thoughts on this I'd still like to hear them for educations sake. Thanks

9th September 2004, 12:38 AM	#4
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Do you already have the woofers for the Bang? I followed the link and it calls for the MCM 55-1170 woofer which is not in stock and has a 100 day lead time which means to me, forget about it.

9th September 2004, 02:20 AM	#5
dvdwmth diyAudio Member Join Date: Apr 2004 Location: Toronto	Oh Damn. No I dont. I just wanted an efficient cheap speaker to experiment with that didn't use a full range driver since I just did two of those and its hard to get much cheaper than the bang. Guess Ill do a D3 then. I was going to get to those dayton drivers sooner or later. Im really itching to try them in the TL Dave... forgot his last name...Brown maybe... designed. Anyway, if anyone else is wondering about this driver placement thing, adire replied to my email on the subject as follows: The woofers are kept as close together as possible to keep the dispersion even; moving them further apart will hurt the off-axis power response of the speaker, and is not recommended. So there you have it.

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