20-30hz tapped horn for studio with ande drivers

[tb46]

Hi reminence,

The T-TQWT is bjorno's specialty, he has suggested that particular layout many times; maybe he'll chime in on this subject for your application. For general information and references see these threads:

Tang Band Tang Band W8Q-1071F 8 X 12 box reccomendation, and

Fiddling with Hornresp - Peerless 831759

The simulation is for Xmax (Hornresp: 11.0991mm @ 38Hz) @ 250W into 8 Ohm. Obviously it depends totally on the quality of the data. The best first step would be to measure the T/S parameters.

By the way, even a dual driver version (e.g.: push-pull) would be only 260 L_net (Hornresp).

Regards,

[bjorno]

Hi,

FYI, Another Ande LB1560 T-TQWT design:

b

[reminence]

Originally Posted by jbell

Here's a thought for you. The LB1560 looks on paper like a great driver.... how about a djk PPSL cabinet? Then your drivers can work for either the TH or the PPSL?

In about 300liters you can PPSL a couple drivers and get flat down to about 28hz.

Im still very interested in this design, I bet it will be heaver and less portable than I wanted but after reading much on the ppsl design I have become entranced with the relatively simple and small boxes that go very low and have less distortion than horns!

considering that two lb1560=24kg how much weight would you estimate the whole box to be?

[reminence]

Originally Posted by bjorno

Hi,

FYI, Another Ande LB1560 T-TQWT design:

b

As far as I can tell the t-tqwt design needs a lot of tweaking and damping to get right. This doesn't work well with me as I know I lack finesse and patience haha

Also would I be wrong in differentiating this between a tapped horn by moving the speaker position to half way and the mouth as apposed to both ends in a tapped horn?

I would assume that by doing this the box ends up resonating or having positive phase relationships in half the length than a tapped horn, or at least for the back end of the horn.

[tb46]

Hi reminence,

Post #24:"...the t-tqwt design needs a lot of tweaking and damping to get right."

If you compare the SPL responses of e.g.: the 212 Kraken (485.837 L_net) v. a Dual LB1560 T-TQWT (260.603 L_net), I think that is pretty much a wash as far as tweaking is concerned. Both benefit from some absorptive treatment in the horn path, and both need steep high and low cut filters.

Regards,

[reminence]

So a t-tqwt does not need much tuning? I am surprised that two of the much larger and more powerful ande drivers don't give much more volume.

hmm Im curious now, what about a ppsl tapped horn? is it possible & has it been done?

Also what is considered the most efficient enclosure design for subs regardless of any other characteristics?

[reminence]

Decided to go with the kraken 112 for a first build. I would go for the full thing but havent got the room for it not to mention the ability to easily move it...

Once the project is done I will look into some awe inspiring very loud and low (probably big and heavy) ande 1560 boxes, maybe dags 40hz one, or maybe ppsl.

Thanks everyone,

Jaye

[reminence]

How large would a ande lb1560 ppsl 20hz tuned ppsl box be for studio? Or wouldnt it work?

[tb46]

Hi reminence,

20Hz is too low for this driver in a bass reflex box, and that is basically what a vented PPSL is. If you're trying to go that low with the Ande LB1560 you'll need to go with the T-TQWT, and even then the mid-20s is about the most you should consider. You could be the first to build a PPSL-T-TQWT :-).

Regards,

[reminence]

Originally Posted by tb46

You could be the first to build a PPSL-T-TQWT :-).

Hmm, the jbl drivers might be suitable for this (to keep the box size/ LF down) and I'm open to new things. How big do you think the enclosure would get?
I don't think I could go much bigger than the kraken112/ss15 size.