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Old 14th February 2009, 10:46 PM   #381
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Finished Boxes
(Thanks for Rob, Helmuth, Tinitus and Obviously Joe's Advice)

Havent listened to them yet I am still building the crossovers.......
Will be a week or two because of work commitments...........


-Dan
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File Type: jpg completed elsinores.jpg (92.1 KB, 940 views)
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Old 15th February 2009, 01:17 AM   #382
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Quote:
Originally posted by danieljw
Finished Boxes
(Thanks for Rob, Helmuth, Tinitus and Obviously Joe's Advice)

Havent listened to them yet I am still building the crossovers.......
Will be a week or two because of work commitments...........


-Dan
WOW! They look really nice. Good work.

You are right about soldering the tweeters, but not unique to just these tweeters.

Joe R.
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Old 15th February 2009, 01:51 AM   #383
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Quote:
Originally posted by Joe Rasmussen


Take a look at this post:

http://www.diyaudio.com/forums/showt...06#post1161906

Focus on the Vifa XT25 Tweeter - incredibly flat ON axis (reputably goes up to 40KHz), but how the OFF axis response is dreadful (almost -20dB @ 20KHz).

I used this tweeter in Mark 1 version of the Elsinores with waveguide. The OFF axis response was hugely improved by the waveguide. Others have noted this as well. Indeed I mentioned the Lipinski L707 earlier that also uses XT25 and has been measured with an improved OFF axis response.

The HDS tweeter is a very different kettle of fish. If you haven't read the whole thread, you might find it interesting, starting here:

New Scan-Speak D3004/660000 Distortion Tests

Joe R.
Thank you Joe.

Its surprising how the waveguide improved the off axis performance.
Did you find a similar outcome with the Mark 3 (stepped felt) version where I'd assume the felt would absorb some of the off-axis energy?
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Old 15th February 2009, 08:01 AM   #384
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Quote:
Originally posted by David Gatti

Its surprising how the waveguide improved the off axis performance. Did you find a similar outcome with the Mark 3 (stepped felt) version where I'd assume the felt would absorb some of the off-axis energy?
Yes and no. The felt being absorbent is not so much the whole point here, it is as much the shape that is important. But felt is good stuff to use and reasonably easy to get results.

The strengthening of the off axis response I believe is due to boundary effects. The way I see it, it will stiffen the air impedance enough to lift the output closer to the boundary (which is in line with the off axis). The off axis output of the tweeter itself is not increased, so it has to be an acoustic Z factor. I would love anybody reading this make any comments - and any explanation they might have. Think of folding the sound forward rather than absorbing it or dissipating wide on a flat baffle. But that 'forward' is still off axis and in fact reinforces it. I am trying to paint a word picture.

At the bottom of the passband, the waveguide has an additional effect. It has a similar result as if increasing the surface area of the tweeter. Again an acoustic Z factor, but a different type. I believe this is desirable as the area of the midrange cone is relatively larger, in fact much larger, than the tweeter at the frequencies where they intersect (crossover), even allowing for the midrange cone decreasing its radiating area as it gets closer to the crossover (it can only do so much as the beaming effect gives it away). It allows for a more gradual acoustic hand-over between the drivers. So the gradual decrease in radiating area is just that, more gradual and less obvious to the ear. Remember, it has to go from wide down to just 1 inch (25mm) into the lower and mid treble.

Waveguides are deceptive things and not immediately obvious the good they can do.

Joe R.

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Old 15th February 2009, 05:03 PM   #385
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Hi danieljw, great work! Could you show me a closer pic of the felt around the tweeter? Is it felt?

Quote:
The moral of my little story is i wanted to let other constructors know that the tweeter terminals need to be soldered quite quickly so as not to damage the coil wiring. so no one else has this mistake
You had a bad experience, but you came out of it good, great work again.
But fortunately I used speakon terminal for all the drivers in this project
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Old 15th February 2009, 07:02 PM   #386
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Hi sorry i cant take a pic of the felt today (Work)

it is 3mm felt stacked together to make the thickness.

I am going to purchase the correct thickness soon.

-Dan
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Old 20th February 2009, 03:13 PM   #387
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Default Good news and bad news

Good news to those who want to build this speaker cause the nomex wofer is on sale at Madisound as of today, the price now is o nly $42-.

The bad news is , The driver might be replaced with a new model.
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Old 20th February 2009, 03:55 PM   #388
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Default Re: Good news and bad news

Quote:
Originally posted by marchel


The bad news is , The driver might be replaced with a new model.
were did you hear that?
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Old 20th February 2009, 10:27 PM   #389
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Default Re: Re: Good news and bad news

Quote:
Originally posted by CCU


were did you hear that?
Hi, Nobody told me that, I'm just speculating, I've indicated it in my sentence be saying "might be".

OTOH, Some of the siblings of this drivers in the entire current peerless line are discontinued. Some 4" midbass and the Exclusive 5" , So this could be next.
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Old 22nd February 2009, 08:47 PM   #390
jpvt68 is offline jpvt68  Australia
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Hi, I've been waiting for a shipment of these drivers to come in and have been told the wait is because they are being made in a new factory
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