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Multi-Way Conventional loudspeakers with crossovers

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Old 28th October 2011, 11:29 AM   #11
erjee is offline erjee  Netherlands
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Originally Posted by gedlee View Post
Very respectable work.
Thanks!

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Originally Posted by 454Casull View Post
I see you like your bass!
There is a solid and tight foundation, for sure, but it is not too much (from my perspective as a bass player )

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Originally Posted by ttan98 View Post
erjee,

Nice work, at the same time the system costs a fraction of an equivalent commercial system. Should sound very good even without listening to it.
Thanks! Whenever you are in the netherlands, come by for a listen
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Old 29th October 2011, 02:01 PM   #12
bwaslo is offline bwaslo  United States
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erjee, can you give any more details on how you did the foam and containerboard? Is it just a strip of foam contained by containerboard?
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Old 29th October 2011, 02:56 PM   #13
erjee is offline erjee  Netherlands
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Originally Posted by bwaslo View Post
erjee, can you give any more details on how you did the foam and containerboard? Is it just a strip of foam contained by containerboard?
Yes, in combination with a lot of ducktape (and a couple of screws now), that's all

Click the image to open in full size.

Combined with the large magnet of the midwoofer this creates a fairly narrow, well damped slit. The lightgrey foam is Visaton NG42 (Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories) and the dark grey stuf is some unbranded acoustic foam to fill-up the remaining gap.
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Old 29th October 2011, 03:07 PM   #14
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Is the foam fire-retardant? I expect that the voice coil heats up significantly when played loudly.
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Old 29th October 2011, 04:21 PM   #15
erjee is offline erjee  Netherlands
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Originally Posted by 454Casull View Post
Is the foam fire-retardant? I expect that the voice coil heats up significantly when played loudly.
As far as I know it is not fire-retardant. The foam is not positioned close to the voicecoil, it only covers the ribs of the 10PS26 so there is some volume of air.

But I won't expect problems for normal home-use. My Hypex amplifier can only deliver 100W/8Ohm, which is just enough to deliver peaks at 200 Hz of 105 dB at listening position, and I never felt a change in temperature of the magnet after playing loud. I estimate that the average power in such a situation would be much lower, maybe 10 W, because the sensitivity at 500 Hz is 5 dB better and the average power level for music is much lower than the peak level.
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Old 28th July 2012, 07:53 AM   #16
sumacSK is offline sumacSK  Slovakia
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Hi erjee, very nice project! Do you by any chance have polars of the "mid" alone? with no filter..

thanks
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Old 14th August 2012, 06:26 AM   #17
erjee is offline erjee  Netherlands
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Hi erjee, very nice project! Do you by any chance have polars of the "mid" alone? with no filter..

thanks
Hi SumacSK,

Thanks! I found a measurement of the mid alone:

Click the image to open in full size.

This is the raw response without any eq.

Last edited by erjee; 14th August 2012 at 06:29 AM.
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Old 17th November 2012, 10:50 AM   #18
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Awesome work!! Any chance of a closeup or drawing of the rear? Ive been wanting to do a very similar setup with a 15" mid.
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Old 19th November 2012, 04:42 PM   #19
erjee is offline erjee  Netherlands
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Awesome work!! Any chance of a closeup or drawing of the rear? Ive been wanting to do a very similar setup with a 15" mid.
Thanks!

I have no access now to a high resolution photo of the back now, but the construction is as simple as you can see in the photo. The 10" midwoofer has a large magnet, the volume between the magnet/frame and cardboard cylinder is filled with foam. I think the cardboard construction is somewhat lossy so this might contribute in a positive way.

If the construction is still unclear to you, please say so, I can make a drawing for you.
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Old 19th November 2012, 11:22 PM   #20
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Got it thanks. Keen to try something similar soon.
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