Best Solution ??

cybtech · 30th June 2004, 12:03 PM

Hello everybody,

I would like to redesign my loudspeakers. The speakers are :

Beyma CP21F tweeter
Davis 16GKLV6M medium
2X Focal 8K415

I will make a closed cabinet for the medium and the tweeter. About 17liters should be OK.

Now here's my problem :

As i have two 8 inches speakers per loudspeaker, i hesitate between making 66 liters vented box for both speakers or make a 33 liters box per speaker...

What would be the best solution according to your own experience?

cybtech · 5th July 2004, 01:41 PM

No one to help me???

BillFitzmaurice · 5th July 2004, 02:19 PM

The end result would be the same sonically speaking; the only reason to choose one box or two is for placement reasons.

richie00boy · 5th July 2004, 02:47 PM

I think he means all within the same cabinet...

I would go for 2 compartments as it will be more rigid.

BillFitzmaurice · 5th July 2004, 03:35 PM

The idea of totally subdividing the box into two chambers would be no more effective than using cut-out 'shelf' style bracing that accomplishes the same thing but allows air passage within the box. Even a 33 liter box should have full shelf bracing on every panel, as they otherwise would be rife for vibration.

He doesn't state his intent but that Davis mid-bass can cross low enough to allow the 8s to be configured as subs, and I thought maybe he'd prefer 4 small subs to 2 larger ones. Of course for floor standers having both 8s in the same box would be logical to get things high enough, but in that case I don't see putting the mid-bass and HF elements in a separate box. If he is crossing the Davis over higher than 100 Hz he certainly doesn't need to give it a 17 l chamber.

cybtech · 6th July 2004, 11:26 AM

Thanks for your replyes.

Actually i would go for two seperate cabinets for the mid/hf and for the bass.

Perhaps i won't even make a low pass filter for the davis, depending on how it performs in a 17liters cabinet.

It's a bit hard for me to explain everything in english as my english is not as good as it should but anyway, i hope that i'm understandable

Just for you to know, the mid/hf stage will be powered by a creek 5250SE power amplifier and the bass stage will be powered by my Home Theater Amp (NAD T761).

The problem for the bass is that two 33liters cabinet will be larger than the 66 liters box as i don't want to put the ports on the rear of it. And size is an issue as i live in paris in a very small appartement (i know, i should make smaller speakers ...)

30th June 2004, 12:03 PM	#1
cybtech diyAudio Member Join Date: Jun 2004 Location: Paris	Best Solution ?? Hello everybody, I would like to redesign my loudspeakers. The speakers are : Beyma CP21F tweeter Davis 16GKLV6M medium 2X Focal 8K415 I will make a closed cabinet for the medium and the tweeter. About 17liters should be OK. Now here's my problem : As i have two 8 inches speakers per loudspeaker, i hesitate between making 66 liters vented box for both speakers or make a 33 liters box per speaker... What would be the best solution according to your own experience?

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5th July 2004, 01:41 PM	#2
cybtech diyAudio Member Join Date: Jun 2004 Location: Paris	No one to help me???

5th July 2004, 02:19 PM	#3
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	The end result would be the same sonically speaking; the only reason to choose one box or two is for placement reasons.

5th July 2004, 02:47 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I think he means all within the same cabinet... I would go for 2 compartments as it will be more rigid.

5th July 2004, 03:35 PM	#5
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	The idea of totally subdividing the box into two chambers would be no more effective than using cut-out 'shelf' style bracing that accomplishes the same thing but allows air passage within the box. Even a 33 liter box should have full shelf bracing on every panel, as they otherwise would be rife for vibration. He doesn't state his intent but that Davis mid-bass can cross low enough to allow the 8s to be configured as subs, and I thought maybe he'd prefer 4 small subs to 2 larger ones. Of course for floor standers having both 8s in the same box would be logical to get things high enough, but in that case I don't see putting the mid-bass and HF elements in a separate box. If he is crossing the Davis over higher than 100 Hz he certainly doesn't need to give it a 17 l chamber.

6th July 2004, 11:26 AM	#6
cybtech diyAudio Member Join Date: Jun 2004 Location: Paris	Thanks for your replyes. Actually i would go for two seperate cabinets for the mid/hf and for the bass. Perhaps i won't even make a low pass filter for the davis, depending on how it performs in a 17liters cabinet. It's a bit hard for me to explain everything in english as my english is not as good as it should but anyway, i hope that i'm understandable Just for you to know, the mid/hf stage will be powered by a creek 5250SE power amplifier and the bass stage will be powered by my Home Theater Amp (NAD T761). The problem for the bass is that two 33liters cabinet will be larger than the 66 liters box as i don't want to put the ports on the rear of it. And size is an issue as i live in paris in a very small appartement (i know, i should make smaller speakers ...)

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