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Bad thermal switch on my SDA-1C's??
F1nut:
--- Quote --- I was reading somewhere, maybe even in my C-16 manual, that if I couldn't turn my volume knob on the pre to above 12 o'clock, that I should lower the input level of the amp so I can use the full range of the volume knob. (Doesn't make sense to me, but I know I read it somewhere). Not sure why it would matter if you are able to "crank" up the volume on the pre?
--- End quote ---
That sounds to me like they are talking about impedance matching. See if you can't find that info again.
--- Quote --- Is thereany advantage to the .5 ohm resistor vs. jumpering the connections? (Besides keeping the crossover at its original design parameters?)
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That's exactly why you should use the .5 ohm resistor.
--- Quote --- Lastly, I've read about the upgraded tweets, but not sure what gain people experience. Smoother highs?? No one ever really talks about the improvement over the stock SL-2000's - they just say they noticed and improvement.
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For one thing, the SL2000 has a nasty 5dB spike at 12-13kHz, the RD0 gets rid of that.
icravcarver:
In the C-16 manual it states the following:
"The gain of the Carver C-16 is set to provide normal loudness levels with the Volume control set at midrotation. In some installations with a high output source, a highly sensitive power amplifier, and very efficient loudspeakers, a Volume settion of 10 o'clock might produce the highest Volume level you ever use. This condition has several disadvantages:
- The signal-to-noise ratio of the system as a whole is not optimum, since the full headroom capability of the preamplifier is not being exploited, while it is operated close to its "noise floor."
- The Volume control taper rate results in a greater level-change per degreee of rotation than at higher settings.
- The residual mistracking of channel levels in the Volume control will more closely approach its 1 dB maximum specification at settings below 8 o'clock.
The output level of either Main Output is programmable in gain capability. A simple modification can be performed to reduce output level in 3, 6, and 8 dB steps, as required, to extend the range of the Volume control and correct for the problems described above. Contact Carver Corporatoin Technical Services for further information."
That is what I was referring to. I have heard about the impedence matching before. Not sure how critical this may be. I was going to experiment with the input level of the TFM later to check it out. At least while the kids are awake so I can crank it up without having to get a divorce!!!
F1nut:
Ah ok, definitely play around with the settings.
icravcarver:
Well, I played with the settings on my TFM-55 (lowered input knob - ended up at 10:30 or 11:00 on the knob) and all I can say is, WOW! I can't believe it, but it seems to make a difference in the quality of the sound coming from my setup! :o :o
I definitely don't hear as much background noise, obviously since it is reduced and not being amplified, but there is just enough difference in the overall output of my system that I have to say it made an improvement. Now, maybe if I was running Amazings or something of the sort that needed more power than the SDA-1C's, maybe it wouldn't make that much of a difference.
Now I just have to find the time (and money) to work on the Polks!!
OldiesButGoodies:
I followed F1nut's advice on the poly switches - it works great.
Pepe
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