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Old 25th November 2013, 02:22 PM   #1
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Default WoofT height?

Hi all,

I'm mid way through assembling some dmar-ken7.3's and I'd like to also add some wooft's to the setup as well.

I've searched for the wooft plans but to no avail, can someone point me in the right direction or, if there isn't any let me know the height as I'm sure I can work out the rest from there.

Regards
Gavin
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Old 26th November 2013, 07:15 AM   #2
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woofT are pretty somewhat flexible. All depends on your choice of woofer. Since the SDX7 is no more (and was always pricey) there is no cirrent fixed design. We have yet to find something readily available to replace it. There is a 4" Peerless that works nicely in even smaller woofTs, and a 5 1/4" for standmounts, but nothing has clicked for full-aize, full-height woofTs. Not that there isn't one, but that we haven;t run into it.

The idea is to have something with the same footprint as the miniOnken, that reaches to the floor. How far that is depends on how much volume you need, and how high you are willing to have the Alpair 7. If that doesn't give you enuff, it could be extended backwards (as here) or tapered to be wider at the bottom (a challenge if you are building the trapexzoid).

If you are building the rectanglular version, with a standard depth, you can fir 5 1/4" on the sides, 8s on the back. Driver on the back would require lower XO. The trapezoids are limited so 6 1/2s on the side (tight fit) or 5 1/4".

Enclosure can be sealed, vented, TL, or ML-TL. Our 1st woofT is a TL (but stuffed till aperiodic). If i was doing those again they would be sealed. The ones linked above are ML-TLs, a short one specifically done for this prohect (not as good as the taller one for the same driver).

I'll happily help out, you'll need to suggest some woofers.

dave
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Old 26th November 2013, 05:12 PM   #3
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Hi Dave,

Thanks for the info. My knowledge of speaker design is poor so I'm restricted to proven designs that are guaranteed to work.

In light of that I've been looking for a driver similar in spec to the sdx7. How about this SEAS L18RNX/P H1224-08 Woofer ?

I've built the standard rectangular ken's so as you've suggested I guess these will need to be rear mounted or deepen the cabinet to side mount it, is that correct? Is there an audible advantage to either one?
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Old 26th November 2013, 10:47 PM   #4
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I've downloaded the spec pdf, i will have a look at it. It has REALLY rough response up high, i wonder how much a coat of puzzlecoat would have on that?

Rear mounted means you have to cross lower, not a huge issue with the dMar-Ken7.

How low you cross is a trade off between ultimate levels & dynamics possible vrs getting the FR yo do as much of the upper bass/midrange as possible.

A low XO certainly points towards bi-amping.

dave
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Old 27th November 2013, 05:00 PM   #5
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Ah, maybe not the best choice. How about this one? Small enough to front mount?

5" 80w Carbon Fibre cone 8 Ohm B110B/SP1057 type Hi-fi Bass/Mid speaker driver | eBay

Also, I was hoping to run it all from my tubelabs amp. Is there a way to avoid using a second amp?
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Old 27th November 2013, 07:27 PM   #6
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OK, we'll look at that one too. Foing a passive XO is much trickier (a lot of potential woofers are eliminated due to very tight restrictions on required sensitivity) -- and getting a passive XO to work can run alot more than just picking up a 2nd amp (cost of a PLLXO is very low). For passive the drivers need to be side or front mounted... on the front allows higher XO point. The higher the XO, the smaller the XO parts.

Which tubelab amp? If one of the SE amps, power sharing with another amp will really let it shine.

dave
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Old 27th November 2013, 08:23 PM   #7
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Its a simple se. I've used tge big edcor opt's along with eo kt88's. Its about as powerful as it can be without spending silly money.

I'm restricted on funds (apologies, also aesthetics thanks to the waf) hence my fear of another amp on show. Do I need to build another simple se for the wooft's

Click the image to open in full size.
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Old 27th November 2013, 09:57 PM   #8
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Quote:
Originally Posted by mudchute View Post
I'm restricted on funds (apologies, also aesthetics thanks to the waf) hence my fear of another amp on show. Do I need to build another simple se for the wooft's
A nice SS 40+ W 4 ohm capable stereo SS amp would be better. With the price of budget amps these days it could easily comein at less than the cost of passive XO parts (and avoid maybe having to get multiple sets as you work out the values needed). I recently priced out components for a 350ish Hz XO and they ran over $150 (cheap parts were less). Prices go up as frequency goes down. Even a 10 boot sale 1970-80s receiver would get you started.

dave
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Old 27th November 2013, 10:21 PM   #9
zman01 is offline zman01  Bangladesh
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For a second amp maybe one of TPA3116D boards that are making waves in the Class-D section? Low cost, small in size, needs little power.

Dave, when bi-amping, won't mudchute need a XO solution like MiniDSP?
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Old 27th November 2013, 11:01 PM   #10
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Ok, 2nd amp it is then. I have one I should be able to get hold of that has those features.

What else shpuld I start stocking in prep for the wooft plans?
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