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Old 19th October 2012, 07:02 PM   #11
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Quote:
Originally Posted by buzzforb
I have MJK's worksheet, and dont mind doing some legwork, but i was wandering what yo thought of the idea and if you had any pointers. I really dont want 20Hz bass, 40hZ bass that is clean and fast would be nice. I plan to mate to a big horn.
Well, with a low Qts and ~40 Hz Fs that’s about the best you can do with this driver.

How big a horn [HxWxD] and will it sit on top or in the cab? What is the desired horn and/or woofer centerline height? Will a high output impedance drive it? This will raise Qts/increase net Vb ideally required.

Have you started a thread? I prefer to respond on-line to these types of general interest Qs.

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Old 19th October 2012, 07:05 PM   #12
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Quote:
Originally Posted by buzzforb
Horn/TL combo
HAvent decided on the horn yet. THnking jmlc 400, Iwata of similar or lower tuning, or jbl like biradial. Thinking of Altec 288 for horn, super if needed. I am opent osuggestions on the compression drivers. Reason I like tl is dampeniong of resonance. I have listened to mutiple of Dave Onken's and just like the sound. Have heard Scottmooses Pensils and horns. Listenening height between horn and woofer is 32 to 40". I like this design, if you are wondering about size limitations.

Wardsweb DIY 3-way horns

So I assume tah for MLTL you want mid Qts driver with low Fs.
It needs enough Vas to allow a long enough cab to get good ¼ WL loading of the vent, i.e. if a T/S cab alignment calcs a long vent, then it’s better suited to a inverse tapered TQWT.

I prefer W.E./Altec, but I’m now decades out of date experience wise plus I prefer stacked dual 1” horn/driver combos to get the big driver’s ‘full’ mids and the smaller driver’s superior HF response, so best to browse the various forums, especially the H.E. ones.

FWIW, if I were in the market, I’d take a hard look at the 2 way compression drivers now available as a viable alternative to dual 1”.

OK, experiment with this one to find what might work good enough in room:

L = 40”
SO/SL = 267.84” [make width = horn width]
Zdriver = 8”-13.96” [depending on LP distance]
Rport = 6”-8”

GM
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Old 19th October 2012, 07:17 PM   #13
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THanks GM. I read last night that you suggest tqwt for drivers with Qts<.4, MLTL~.4, and horn>.4, in general. Is this stil true? Do you also suggest to tuning to Fs. I have seen some suggest tuning higher.
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Old 19th October 2012, 07:24 PM   #14
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how much you paid those 2226 ?
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Old 19th October 2012, 07:36 PM   #15
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$425 for both
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Old 19th October 2012, 07:59 PM   #16
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what's wrong with these :

Altec Lansing GPA 416 416-8C NEW | eBay

http://tinyurl.com/8dpgljf
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Old 19th October 2012, 08:02 PM   #17
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Neither is Alnico, which is big draw of Altec, from what I have read. Otherwise nothing.
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Old 19th October 2012, 08:05 PM   #18
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Quote:
Originally Posted by buzzforb View Post
....... nothing.
exactly ;

point is - with 2226 , you have so much copper/former/spider/cone/surround unnecessary power capability , which acts only as burden
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Old 19th October 2012, 08:42 PM   #19
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What you think of this discussion

"BEST" Woofer 50Hz - 300Hz & Hi eff, maybe 15" ??

Does post 132 relay what you are trying to say. What is importance of Le? Hig or Low? Effects on HF?
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Old 19th October 2012, 08:52 PM   #20
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sort of

but , for my limited xperience ,Mms/Le combo is more improtant than Mms/Bl

so - looow Mms , looow Le = speed , and that is also good base for extended upper frequencies
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