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In Reply to: RE: Dahlquist DQ-LP1 Electronic Crossover posted by Lew on September 13, 2016 at 18:08:29
The LP-1 input impedance is adjustable.
The factory setting is for 75 to 100 K ohm amps.
This setting influences the crossover point. You gotta read the manual carefully.
FWIW: I have one of these I have used for years. I do NOT run the top end through it any more, even with a quality cap in the top end section, I can hear a difference in transparency.
But even so, I find the LP-1 at least as good, even full range, as any other electronic crossover available, and way better than most.
It is possible that a better cap could convince me to run the top end through the LP-1, but I have not bothered.
Just running the subs with it now.
Follow Ups:
Even a fancy cap like Teflon or polystyrene will be audible. No such thing as a truly neutral crossover they all leave their thumbprint. A simple series cap will be as neutral as it gets.
Unfortunately, or fortunately, kentaja is right. He told me, but, of course I would not listen...and wasted time.
Until I ran my Quads full range and realized what I was missing.
I suppose if you have speakers that are brightish, you might tune the cap to ameliorate that brightness, but you can still hear the cap.
Dammit!!!!!
I decided to leave the factory setting, as it was so close to achieving the crossover point that I desired. The other reason I left the factory setting alone was that I am not sure how to install the resistors in the small tubes provided in the circuit(arrow in picture-not my unit).
Do you solder the added resistors into the tube or just push the resistor leads into the tube. The latter would seem to be a bad choice. Thanks in advance.
The idea of the sockets is to allow you to insert the resistors without soldering them in.
The earlier link in this thread will take you to an owner's manual you will need to figure out how to handle amps with a different input impedance.
According to the manual, using an amp that is appreciably lower or higher in input impedance will change the xover point either up or down, depending on that impedance. The resistor (or capacitor) is to compensate for that difference.
second home, and I am not there right now to access my manual. Using the manual's formula, I needed a very small resistor to slightly change my desired crossover point, but I don't remember reading how to attach the resistors in those tubes. Many thanks for the explanation.
My sub amp is a NAD 2600A, and the subs/woofers? are a pair of really inexpensive Polk RM1000 speakers spiked on cement slabs with lots of lead weight on top. My main speakers are Hitachi HS-500s.
Glad to help. I suspect that second system sounds very good.
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