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A few weeks back I started comparing different tubes in my amp. To make my comparisson a little easier, I replace the tubes of one channel only and than listen for the difference in the left and right channel, using a mono recording on one of the XLO test cds.
As it turned out, the right channel always sounded a little thinner than the left channel.
So I swapped the speaker cable from left to right to see if this was coming from the CD player or the amp. As it turned out, the right channel continued having the thinner sound.
Than I disconnected my speakers and hooked my Radio Shack digital Voltmeter to the speaker to get a ohm/resistance reading. Guess that due to the cross over my meter was not able to read any resistance = not 0, but unable to read.
So I unscrewed the mid bass drivers on my Sapphire III and meassure the lead on the drivers direct, thinking than maybe one of the voicecoils on my Sapphire III midbass driver has gone bad.
Reading of the lead where:
Coil #1: 3.8 ohms
Coil #2: 5.1 ohms
Coil #1: 3.2 ohms
Coil #2: 2.9 ohms
I did not disconnect the crossover from the driver, since the leads are solderd to the driver.
What could cause this difference in reading?
Guess this difference explains why my right speaker sounds thinner than the left speaker.
I bought my Sappire II in '91 and upgraded them last year to the Sapphire III status. I also placed the High pass cross over part from my sub one in front of the mid driver cross over.
I also checked the lay out and hook up several times of the new Sapphire III crossover while assembling and after assembling of the new cross over.
Any idea what is "wrong" with my Sapphire III ?
Any other suggetsins on trying to trace down the problem?
I have the Sapphire II's upgraded to the IIIs also. I liked the sound of the II in the mid. Very detailed, almost edgy, sort of up front. The tweeters we a little harsh which prompted the upgrade. When I took the units apart to upgrade the xo, I found the guy before me had connected both lines from the xo to one voice coil on the Focals. I corrected the situation. Now while they sound good, are more forgiving and have a much better stage, I kinda miss that detail. I guess I have to break my ears again.
I know exactly what you mean.
Due to the thinner midbass the highs were more prominent and therefore you/we could hear more detail. At least so we thought.
But I believe that the correct wired Sapphire III sounds more pleasing and correct.
At the same time, while fixing my crossover, the connector pins on the Scan Speak tweeter brock of. What a pain in the .....
Had to cut of some of the plastic covering the extended leads to reconnect the wires. I wished Scan Speak had given their tweeter some better hock up connectors like the old Focal tweeter had.
I agree. I have these awful internal wires the are coated in what looks like teflon. A lot of it. They are so stiff one could push it through drywall. I almost tore the tweeter post off as you did. Next time I pull the speakers open I am changing the internals to zip cord :!).
Yes, I know what wire you got in your speakers, stiff lick heck.
When I upgraded to the SApphire III, I bought a pair of Kimber 4 TC - about 5 ft each from audiogon.com for $ 50. I than cut them to legth of about 1 1/2 ft each. Still a little stiff.
You may want to try Cardas internal hook up wire, if you ever want to replace those stiff Audioquest hook up wires.
Sorry, forgot to mention that this is a Focal" 7K011DBL
with double voice coils
I went back and took a closer look to the cross over and the schematic and found that I did not connect one of the coils correctly. Changing it corrected the problem.
Now the meassurements are 2.9 and 3.2 ohms in the right driver.
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