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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd October 2012, 08:40 PM   #281
tinitus is offline tinitus  Europe
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woofers that end up with a very short port in vented BR ought to work with the very large port area of the Onken design, right ?
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Old 3rd October 2012, 09:55 PM   #282
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Sippy, your a dark horse!! you're turning up everywhere!! Care to shine a light on this for me?

Paging Mr GM, Mr KevinK. Your assistance is needed - a lot

Seen your basement pics Kevink. Nice Onkens
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Old 3rd October 2012, 10:19 PM   #283
sippy is offline sippy  United Kingdom
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Well, You and I share a thread......
My beta build of P10 Emken, which is a 'sorta onken' has adjustable venting right?
Now, given that I'm 'one of those sorta people', how about you can kinda decide how WIDE to build the Onken vent.......then add a bit extra!
Then, one can predict how LONG the vent needs to be........build it slightly short.
THEN, one can either add extensions to the length and shim the width down.
I realised this after 20 secs of looking at my EmKen plans.
Send letter of thanks written on 20 / $10 x 3, marked 'Help Darrell finance First Watt F5T 4 pair'.
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Old 3rd October 2012, 10:24 PM   #284
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Quote:
Originally Posted by sippy View Post
Well, You and I share a thread......
Yes, linked at the Emken!! Phase plugs will be ready mon/tues btw
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Old 3rd October 2012, 10:33 PM   #285
sippy is offline sippy  United Kingdom
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Yes, linked at the Emken!!
Well, it was more the links to 'Really Big 'speakers in small Japanese spaces' on ewetube and a thread titled 'And now for something REALLY Big' that gave it away.
Sending you a pm right the noo
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Old 3rd October 2012, 10:55 PM   #286
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Originally Posted by tinitus View Post
if I remember correctly, woofers with big Vas and lowish Qts

wasnt the original Onken a huge 500liter thing
I tried online Onken calculators for my 12" Tannoys (huge Vas, lowish Qts, ideal port rather large and shorter than my cab walls are thick) once and only ever got the result that this driver is not suitable for Onkens. On the other hand Tannoys best cab for my driver, the Edinburgh, looks rather like an Onken although Tannoy call it 'distributed port'.
I gave up eventually.

Last edited by Charles Darwin; 3rd October 2012 at 10:58 PM.
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Old 4th October 2012, 02:22 AM   #287
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Originally Posted by Brett View Post
That should be 12 and 24dB/oct respectively.
It is not uncommon for custom DIY speaker designs to measure/simulate the room gain effects, and design a bass cabinet that complements this gain. The lower 1-2 bass octaves can be designed to have modest 6db/octave slopes, typical standard Qtc slopes, steep slopes, or bass shelf shapes to complement the room gain, placement near walls, room pressuriazation gain, and ground bounce effects.

I have done this for an Altec 604 MLTL. The speaker had to be put against the rear wall and the woofer height above the floor was carefully engineered to take baffle step and ground bounce into account on a carpeted floor.

Old-school solutions for simple gain stages without electronic equalization.

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Passive Crossover Designer - Design passive crossovers and equalization networks


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Old 4th October 2012, 03:06 AM   #288
Pano is offline Pano  United States
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Quote:
Originally Posted by tinitus View Post
wasnt the original Onken a huge 500liter thing
No closer to 360 L. The Altec 416 does well in a large cabinet.
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Old 4th October 2012, 03:19 AM   #289
djn is online now djn  United States
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Hi Line. I've read what you wrote and have read it elsewhere, but I still don't understand it.

I have JBL Barzilay cabs that I braced up really well. They ended up with an internal volume of 4.556 ft3. I just got my Lambda TD15X drivers yesterday. When I plug in everything into WinISD it shows an F3 at 40hz. That is with 2 4" ports each 9.5" long.

SO, What could I or should I be doing to make sure they work best in my room?
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Old 4th October 2012, 03:59 AM   #290
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Originally Posted by djn View Post
Hi Line. I've read what you wrote and have read it elsewhere, but I still don't understand it.

I have JBL Barzilay cabs that I braced up really well. They ended up with an internal volume of 4.556 ft3. I just got my Lambda TD15X drivers yesterday. When I plug in everything into WinISD it shows an F3 at 40hz. That is with 2 4" ports each 9.5" long.

SO, What could I or should I be doing to make sure they work best in my room?
Your WinISD simulation of the TD15X looks correct with my data. Since your cabinet size is already fixed, your main option is to change the box tuning by changing the port dimensions after lowering the tuning frequency on the WinISD BOX window, and changing the speaker position in your room so the combination of room+speaker generates the best response.

Have you downloaded and entered your room/speaker setup into:
jbagby

"The Diffraction and Boundary Simulator" 1.20 spreadsheet and it's VBA modules by Jeff Bagby
Passive Crossover Designer - Design passive crossovers and equalization networks

This will give a rough estimate of rear wall, floor, corner, woofer height, open walls, etc.. effects.

Measurements are the next step for tuning the Xover.
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