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Old 3rd January 2009, 03:12 PM   #11
AndrewT is offline AndrewT  Scotland
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you may find that silver plated copper wire of smallish gauge works well for the treble driver. Not too much more expensive than copper wire.
I would never go to the expense of silver wire, not even as an experiment.
Tinned (Pb/Sn) or tin plated (Sn) copper wire is an alternative that prevents the copper from corroding.

Most drivers with a very low Q will not work as expected with a 2r3 source impedance. High Q drivers will be less affected but must still account for Rs as you seem to be aware.
You can convert a low Q driver to medium Q and a medium Q driver to high Q using the Rs technique.

The tube amp and the crossover will both benefit greatly from near constant impedance across each individual driver. Spend some time trying to equalise out the impedance variations using Zobel etc.
This will waste output power but that is a consequence of using high Rs.
I don't know any way to avoid it with a single amplifier and passive crossover. Comments please?
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Old 3rd January 2009, 03:56 PM   #12
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Quote:
Originally posted by Cousin Billy
At AudioGon I have read 'smearing ' occurs with thicker wire, especially going to the tweeter's. Thus the thinner the better.

I have read hear, and at AudioGon, about copper, silver plated copper, silver, and gold wire. Some people use one kind for their tweeters, and yet another for the lower drivers.
Take everything that you read at audiogon with a huge grain of salt.
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Old 3rd January 2009, 03:56 PM   #13
Ron E is offline Ron E  United States
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Quote:
Originally posted by Cousin Billy
Yes AndrewT, they are Atma-Sphere MA1
You could always ask Ralph Karsten, I'm sure he has an opinion.
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Old 3rd January 2009, 06:44 PM   #14
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I would suggest something like 14awg for bass, 16awg for mid and 18awg for the tweeter.

I've heard some plated wire that sounded harsch to me, so I would suggest that you test them first if you want to go that route.
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Old 3rd January 2009, 10:06 PM   #15
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AndrewT

The drivers have a Qms of 4.49, Qes of 0.29, and Qts of 0.27.

They will be driven in series, not parallel.

How would you classify this Q?.
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Old 4th January 2009, 12:50 AM   #16
Ron E is offline Ron E  United States
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Lemme guess:
http://www.madisound.com/catalog/pro...oducts_id=1032

Driven by a 2.3 ohm source impedance you are looking at a Qes of

2*pi*20.4*.032*(5.9+2.3)/9.1^2 = Qes = 0.41, So then Qts= 0.38
and your 1W/1m sensitivity is about 86.5, and that doesn't even include inductor DCR if you are using a passive xo. So your driver goes from lowish to medium Q, just because of your amp.

Wire Gauge Resistance per foot from
http://www.radiolocman.com/shem/shem....html?di=18899
AWG Ohm/ft
4 .000292
6 .000465
8 .000739
10 .00118
12 .00187
14 .00297
16 .00473
18 .00751
20 .0119
22 .0190
24 .0302
26 .0480
28 .0764

seems like wire resistance in the 12-18gauge range doesn't amount to much unless you are wrapping the inside of your speaker when building a crossover.
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Old 4th January 2009, 03:14 AM   #17
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Thank you Ron E

That sounds like good news.

Any more information would help.

What is your views on running the drivers is series?.

Bill
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Old 4th January 2009, 03:43 AM   #18
Ron E is offline Ron E  United States
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Quote:
Originally posted by Cousin Billy
What is your views on running the drivers is series?.
That's your decision. The OTL amps would probably prefer the 16 ohm load to a 4 ohm load. You could always put them in parallel and use autoformers.
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Old 5th January 2009, 04:28 AM   #19
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To me it is a contradiction, when constructing a crossover, to use heavy guage wire when the leads of the crossover components (caps and resistors in particular) are so thin...

Heavy guage wire for long runs between the amp and speakers seems to make sense.

Ray
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Old 5th January 2009, 01:26 PM   #20
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Ray

I will take your comment one step further.

The leads of the driver itself are very small. It looks to me like 26 or even 28 guage leading from the driver terminal into the voice coil.

Like you said, the leads of the Duelund Graphite resistors look to be 26 - 28 guage. The leads of the Duelund VSF caps 24 - 26 guage, etc.

The inductors obviously are much bigger.
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