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172.117.0.69
I have a Pass SIT-3 amp on the way and I've heard that it prefers to see a 4 ohm load and uses have "added a resistor in parallel to drop the impedance that the amp sees to 4 ohms". How would one do this in practice?
Follow Ups:
It's hard to believe Nelson Pass would endorse such a thing, unless the amp uses some odd power transistors that are especially sensitive to speaker impedance. But still, it's not a good idea for all the reasons cited below.
I've had the experience of removing a resistor from an RC network defining a high pass filter in Sound Lab speakers. The inherent impedance of the speaker at mid-frequencies (with no crossover) was about 20 ohms on the primary side of the audio step-up transformer. As in your case, SL used an 8-ohm resistor in the RC network, which meant that most of the amplifier power was flowing through the resistor. This also did not suit my OTL tube amplifiers which like a high impedance. Removing the R was a revelation. It dramatically increased SQ and efficiency. (There's more to the story, of course, had to also change the treble transformer for a full range one.)
so you have to waste 1/2 the power to make it sound good? Who dreamed up that one?
Just goes to show, don't believe everything you read on the internet.
As others have stressed, this is not a good idea.
Dan Santoni
Get the amp and try it with your speakers. Adding a resistor is not a good way to go. If you want expert info on matching, go over to DIYaudio and ask Nelson Pass at his sub- forum
Each of us has their own way of doing things and this is something I would never do.Speakers are not a constant load. Their impedance changes relative to frequency. You don't mention the speaker, but there is a good chance the impedance does dip down to 4r at certain frequencies.
Edits: 07/16/22
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Have Fun and Enjoy the Music
"Still Working the Problem"
That appears to be a very easy speaker to drive. I would simply hook them up and enjoy them!
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Have Fun and Enjoy the Music
"Still Working the Problem"
Any particular reason?
I think you'll need a resistor the same resitance as speaker impedance.....In this case, 8 ohms.
You'll also need a power rating similar to the speakers actual usage....and a fudge factor.
The power will be distributed about 50:50 between speaker and resistor.......which ultimately I suspect will run pretty HOT...
Too much is never enough
The data sheet says the speaker is 15 ohms.
To get a 4 ohm load from a 15 ohm speaker the parallel resistor needs to be 5.5 ohms. The resistor will suck up most of the power.
That doesn't sound like anything I would do.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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