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Multi-Way Conventional loudspeakers with crossovers

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Old 4th October 2012, 08:41 PM   #301
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Click the image to open in full size.

Plus, the 414 really bumps.

Last edited by d to the g; 4th October 2012 at 08:47 PM.
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Old 4th October 2012, 10:43 PM   #302
djn is offline djn  United States
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Can you tell us a bit about that speaker D? I like the horn.
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Old 5th October 2012, 02:30 AM   #303
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It's an bastardized Altec "the carmel" with a pair of 414z in an open back configuration. The horn is from Jeffery Jackson's "elevenhorns" with a TAD 2001. The horn and driver are on loan from a friend, the TADs are beyond my reach. My room is pretty small, like 12'x14', and these are about 1/3 of the way into the room. They definitely move a lot of air, even open.

Currently, I'm running them first order at 800Hz but it's not the best crossover by any means. I'm waiting for minidsp to finally get my plugin code, but it's like pulling teeth. When that happens I'll biamp and play around trying to figure out where and how I best like them crossed.
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Old 5th October 2012, 08:53 AM   #304
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Quote:
Originally Posted by Pano View Post
Sure, but shipping and import/VAT UK style would raise that amount a lot.
tell me about it!! 20% of the cost of the item AND the postage =

I'm gonna plug some numbers from a few of the proposed drivers into the onken calc to see if I can get lucky on the vents
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Old 5th October 2012, 02:02 PM   #305
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ok - ive tried with a FP driver and an PD driver and I cant get any sensible. Tiny boxes being projected - 80l or so not including vents. I dont get it. I'm not even sure that I can enter the Sd values correctly.

Anyone out there with a non Altec Onken? Or does anyone have a couple of brain cells I can borrow? I have the feeling I'm being a bit thick

Would a simple sealed or vented arrangement be suitable instead, without loosing the magic?
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Old 5th October 2012, 03:28 PM   #306
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Quote:
Originally Posted by JRKO View Post
tell me about it!! 20% of the cost of the item AND the postage =

I'm gonna plug some numbers from a few of the proposed drivers into the onken calc to see if I can get lucky on the vents
I've mail ordered some t-shirts from the US once. They charged me 17% import duty and 20% VAT on top of that!

Never had much luck with Onken calculators.
Tried it with my Tannoys and my Volt woofers, the result was tiny cabs with vents over a meter long.
Never quite figured out what makes a driver suitable for Onkens.
The Volts are in transmission lines now and I couldn't be happier!
They are fairly big though but that should not be a problem for you.
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Old 5th October 2012, 04:43 PM   #307
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Quote:
Originally Posted by Charles Darwin View Post
Never had much luck with Onken calculators.

Never quite figured out what makes a driver suitable for Onkens.
Glad I'm not the only one.

The altecs seem to have a low Fs (26hz ish) and MASSIVE Vas of 26cuft or 736l Makes them a rather tough act to follow.

options options options
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Old 5th October 2012, 05:21 PM   #308
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Quote:
Originally Posted by JRKO View Post
options options options
hmm....try look at Fane 15-500 in vented/BR
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Old 5th October 2012, 07:33 PM   #309
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by JRKO View Post
Glad I'm not the only one.

The altecs seem to have a low Fs (26hz ish) and MASSIVE Vas of 26cuft or 736l Makes them a rather tough act to follow.

options options options
your main problem may be that low Qts will never be low budget


try calculate Onken with PD.158 or PD.122

and you need to fiddle with port area and length to make it match your box front

I dont think ports should be less than 1" wide
and also adjust with the 'deviders' also working as side panel bracing
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Old 5th October 2012, 09:52 PM   #310
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The Onken is a bass reflex. You don't have to take the box size for BR that a calculator gives you, it's just trying to find the flattest response. EBS (Extended Bass Shelf) is another way to align the cab. If you can run Unibox (in Excel) have a look at that.

Yes, the old driver have huge Vas, and that's part of what makes them work in the big Onken/Ultraflex box.

But let's back up a little. What are your real goals? Are you looking for super clean bass that can be run off an SET amp, or do you just want big bass fun? Lots of driver surface area, like 1 or 2 18s per side will get you big bass fun and stay real clean at the power levels used in a home. Once you start to get a lot of surface area, the bass gets clean and big. You might need to EQ it some if the box is too small, but you'll have so much headroom that isn't a big deal.
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