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Old 7th April 2013, 12:12 AM   #1541
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Without the port, the length of the port actually becomes the thickness of the back panel itself. That will give you a box tuning around 45-50 Hertz, introduce a significant boost (peak) at 60-70 Hertz. There will be less bass below 40 Hertz. The bass will be truncated by about -6dB at 30 Hertz.

Thems are the numbers.
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Old 7th April 2013, 09:44 PM   #1542
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"introduce a significant boost (peak) at 60-70 Hertz"

Thanks Joe.

What should be the audible result of this. ?
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Old 8th April 2013, 12:07 AM   #1543
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Quote:
Originally Posted by ermat1234 View Post
"introduce a significant boost (peak) at 60-70 Hertz"

What should be the audible result of this. ?
Depends on your room. But audible for sure. But I have to make the thing work accordingly to acceptable rules and good design. The -6dB at 30 Hertz is too much of a penalty - but will only be heard when you have musical material down at that frequency. If I didn't do it right, then the unofficial "union" of loudspeaker designers looking over my shoulder, would look disapprovingly.

I would rather, if possible, experiment with varying room positions. It can make dramatic difference. In my room, 180mm further away from the rear wall was a near revelation. That little bit more into the room, if you can, may make a similar improvement. Try it, if you have the room.

Cheers, Joe

(PS: I don't want to get to heavily into details, but there is a current mirror that sits electrically in parallel, that has a tuned frequency and keeps the current phase angle low. That is near optimum when tuned 33-35 Hertz. I am currently driving my speakers with a "current" amp and it sounds great - will loose that unique capability the Elsinores have - and I may post that "current" amplifier design on diyaudio, 40 Watts per channel.)
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Old 8th April 2013, 02:08 AM   #1544
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sounds good Joe. Please feel free to post away. Love your work !
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Old 8th April 2013, 02:52 AM   #1545
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Thanks.
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Old 23rd April 2013, 11:16 AM   #1546
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Attachment 340813Almost ready to start measuring the "EU-version" with 2x 75mm (ID68) plumbing pipes. .
Have you some news about your project Sharky?
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Old 23rd April 2013, 09:04 PM   #1547
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Have you some news about your project Sharky?
Well, not really. Have been stuck with experimenting with the finishing and trying to get the WG mould build going. Things are going a little bit slow I agree. :-)
I think I just decided to wait for some warmer weather to be able to be outside to finish it. I like to get the finish on before start to mount elements etc. On the other hand I am also curious to see how the two port mount will work like. But hang in there it will soon happen.
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Old 24th April 2013, 04:20 AM   #1548
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I think I just decided to wait for some warmer weather to be able to be outside to finish it.
Good idea! I almost intoxicated myself this winter in the spray boot that I did in my basement to paint the front baffles.
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Old 5th May 2013, 05:33 PM   #1549
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new set under construction:
hi all, this is a VERY slow project for me. probably won't finish till late summer, but got up to this point. so far so good. will veneer the sides, top and bottom. can't wait to listen to them. will post more as progress continues.
thanks,
Scott
Duvall, WA
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Old 19th May 2013, 04:54 AM   #1550
ashaw is offline ashaw  Australia
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I am interested in getting a set of waveguides for the Elsinore. Is there any chance of that anymore?
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