Lambda TD12s Closed Box / Bass Reflex Design

akunec · 12th September 2005, 08:02 PM

I'm going to build a pair of speakers using:
Lambda TD12S 35-350hz
PHL 1120s 350-2800hz
Morel Supreme 110 2800-20khz

Using 3d cad, my maximum box volume for the Lambdas that I can withstand is 69liters net (each).
Using that volume I have come up with a design as follows:
It will consist of 2 ports 10.2cm (4") by 21cm. With both of them opened it will have a 45hz tuning (~2dB bump). This setup would be suitable for when I have parties at my place. With one port closed, it will have a tuning of 33hz. This makes the response very flat, and seems to be more less, ideal for me, given that volume.

With both ports closed, it will act as a sealed box with a Q of .54.

Any thoughts/comments on this setup?

Thanks
Alex

thylantyr · 12th September 2005, 08:18 PM

Looks good.

Will you protoype with active or jump to passive using generic crossover points?

akunec · 12th September 2005, 08:41 PM

I'll probably get a DCX 2496 to prototype with.

I'll be powering the speakers with a 6 ch gainclone
The Lambdas each have a bridged LM3886 to power them.
The Morels have one 3875 and the PHLs have a 3886.

JohnL · 12th September 2005, 08:57 PM

I have tried TD12S in a 90L box with 2 4" ports (I think the ports were closer to 12") and they sounded great, but the boxes were just too huge for the living room. I went to a 55L sealed box and they sound great, if not a bit bass shy.

John

Audiophilenoob · 12th September 2005, 09:18 PM

I assume you are using Dual PHL's since you want 350hz out of them?

BTW there's at least a 2 mth waiting period on lambdas so I hope you have the 12

akunec · 13th September 2005, 12:21 AM

No, I'm using just a single PHL 1120. If it starts to get a little edgy, I'll shift up the xover freq. I realize Phlaudio recommends a 400hz xover, but I think this is for prosound applications.

I already have all the drivers i need.

Audiophilenoob · 13th September 2005, 12:22 AM

Quote:

Originally posted by akunec
No, I'm using just a single PHL 1120. If it starts to get a little edgy, I'll shift up the xover freq. I realize Phlaudio recommends a 400hz xover, but I think this is for prosound applications.

I already have all the drivers i need.

to keep SQ very very high.... I cross mine at 450hz currently.... and I have a pair per side

thylantyr · 13th September 2005, 02:44 AM

Your plan sounds good. If the bass sounds anemic, get a bigger power
amp for the woofers.

Perhaps add a monster subwoofer for HT duty if these speakers are
part of such a setup.

12th September 2005, 08:02 PM	#1
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	Lambda TD12s Closed Box / Bass Reflex Design I'm going to build a pair of speakers using: Lambda TD12S 35-350hz PHL 1120s 350-2800hz Morel Supreme 110 2800-20khz Using 3d cad, my maximum box volume for the Lambdas that I can withstand is 69liters net (each). Using that volume I have come up with a design as follows: It will consist of 2 ports 10.2cm (4") by 21cm. With both of them opened it will have a 45hz tuning (~2dB bump). This setup would be suitable for when I have parties at my place. With one port closed, it will have a tuning of 33hz. This makes the response very flat, and seems to be more less, ideal for me, given that volume. With both ports closed, it will act as a sealed box with a Q of .54. Any thoughts/comments on this setup? Thanks Alex

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12th September 2005, 08:18 PM	#2
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	Looks good. Will you protoype with active or jump to passive using generic crossover points?

12th September 2005, 08:41 PM	#3
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	I'll probably get a DCX 2496 to prototype with. I'll be powering the speakers with a 6 ch gainclone The Lambdas each have a bridged LM3886 to power them. The Morels have one 3875 and the PHLs have a 3886.

12th September 2005, 08:57 PM	#4
JohnL diyAudio Member Join Date: Apr 2004 Location: Tampa, FL	I have tried TD12S in a 90L box with 2 4" ports (I think the ports were closer to 12") and they sounded great, but the boxes were just too huge for the living room. I went to a 55L sealed box and they sound great, if not a bit bass shy. John

12th September 2005, 09:18 PM	#5
Audiophilenoob diyAudio Member Join Date: May 2005 Location: NC	I assume you are using Dual PHL's since you want 350hz out of them? BTW there's at least a 2 mth waiting period on lambdas so I hope you have the 12

13th September 2005, 12:21 AM	#6
akunec diyAudio Member Join Date: Aug 2004 Location: Alberta	No, I'm using just a single PHL 1120. If it starts to get a little edgy, I'll shift up the xover freq. I realize Phlaudio recommends a 400hz xover, but I think this is for prosound applications. I already have all the drivers i need.

13th September 2005, 02:44 AM	#8
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	Your plan sounds good. If the bass sounds anemic, get a bigger power amp for the woofers. Perhaps add a monster subwoofer for HT duty if these speakers are part of such a setup.

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