Lambda TD12s Closed Box / Bass Reflex Design

[akunec]

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]

Looks good.

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

 

[akunec]

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]

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]

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]

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]

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]

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.