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Old 25th June 2011, 12:27 PM   #911
jdkJake is offline jdkJake  United States
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Quote:
Originally Posted by Joel Wesseling View Post
You dont want to veneer over the plywood end no matter how flush/sanded it is.. The end grain will telegraph through the veneer over a six month period.
Visually or texture-wise?
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Old 25th June 2011, 12:41 PM   #912
ABO is offline ABO  Netherlands
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I am looking for parts to eventually build the Elsinores. However, I can't seem to get hold of 90mm ports. The available sizes are 70 mm or 100 mm. It seems to me that 100 mm could be made to fit easily, but I don't know what the length should be. I hope that Joe or another member can help me out here.

also I am wondering if the quality of the inductors in the conjugate filters is critical. Can I just order std here or is it worth getting baked or foil inductors. I basically have the same question for the extremely high value caps in those same circuits.

Thanks, Lex
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Old 26th June 2011, 08:35 AM   #913
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Quote:
Originally Posted by ABO View Post
It seems to me that 100 mm could be made to fit easily....

also I am wondering if the quality of the inductors in the conjugate filters is critical...
I suspect the internal diameter would be a few mm less 100mm. I would estimate that 105mm long would be about right. I would rather make the port larger diameter and if you can fit 100mm, that would be better than 70mm.

The most critical components are L1 1.8mH (or 2mH) and L2 0.33mH, C1 1.8UF (or 2uF if you like it slightly brighter) and R1 3R.

For those components use the best that you can muster, as for the others, good quality parts are still essential but don't have as direct effect on the sound.

Cheers, Joe R.

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Old 26th June 2011, 11:38 AM   #914
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Quote:
The end grain will telegraph through the veneer over a six month period.
Visually or texture-wise?
Both visual and texture, raised area with plywood lines
Takes at least three extra veneers to cover and wait for months to flush sand.

Joel
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Old 27th June 2011, 02:59 AM   #915
jdkJake is offline jdkJake  United States
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Originally Posted by Joe Rasmussen;2619480[B
C11.8UF (or 2uF if you like it slightly brighter)
So, for those with Mk5, any consensus? 1.8 or 2.0?

Or try them both and come to your own conclusion?
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Old 27th June 2011, 01:17 PM   #916
ABO is offline ABO  Netherlands
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Joe,

Thanks for your reply.

No need for expensive components in the filters then.

About the ports: Isn't there some sort of formula that I could apply to the port after I measure it, to determine the correct length?
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Old 27th June 2011, 02:26 PM   #917
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Quote:
Originally Posted by ABO View Post
About the ports: Isn't there some sort of formula that I could apply to the port after I measure it, to determine the correct length?
I wish...

There is a difference between actual volume of a box and effective volume, and unless you know the latter the formula isn't all that accurate. The Elsinores have low Qb (the Box Q of a reflex box, I have never actually tried measure it) and that translates it into a larger effective volume. But if you have a microphone and a signal generator, put the mic close to the output of the port and do a low frequency sweep. If the maximum output from the port is in the area of 33-35 Hertz, then all is well. If the output is at a higher frequency, then lengthen the port, and vice versa.

You can also do it via an impedance measurement, look for the saddle (between the to peaks) where the Z is lowest, that will be the Fb. But you will need to have L4, R2 and C3 not in circuit.

Cheers, Joe R.
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Old 30th June 2011, 10:11 PM   #918
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So, for those with Mk5, any consensus? 1.8 or 2.0?
I'm running 2.0uf and have no desire to experiment right now. Seems right on but still want to hear the difference at some point..

Joel
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Old 1st July 2011, 01:37 AM   #919
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Quote:
Originally Posted by Joel Wesseling View Post
I'm running 2.0uf and have no desire to experiment right now. Seems right on but still want to hear the difference at some point..

Joel
I was initially inclined to experiment with 2.0uF and 2.2uF, but now more likely to suggest 1.8uF or 2.0uF.

But having said that, the 2.2uF may well work in rooms with heavy furnishings.

Up to recently I was using 2.0uF Rifa PPS 100V caps. With their tolerances likely to be up to 5% (probably lower value). Then I tried Jantzen 1.8uF and they are 2% tolerances and actually measure 1.8uF on the button. So check the tolerances of the cap as many are 5% and 10% - more often measure lower than their offical value.

Again, it is the use of a Waveguide that makes small changes far more obvious than conventionally loaded tweeters. In fact, we could say that the change in value has a three times multiplier effect. So all of a sudden the tolerances of caps are now critical when they were hardly before.

Cheers, Joe R.
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Old 2nd July 2011, 01:21 PM   #920
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Joel,

You said
Quote:
The picture shows one solution. hardwood corners work as well.
The front of the Elsinore is a little harder.
I am planning on using 3/4 plywood for my build. Is this your "one solution"?
It looks like a 45 degree with a 90 degree or two. Use solid wood on the front.

Regards,

John
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