I have b&w 800 matrix speakers,
On some recordings the highs are just too much
Like to have a quick switch on cabinet for a 3db reduction in twtteets out put
What Value resistor
On some recordings the highs are just too much
Like to have a quick switch on cabinet for a 3db reduction in twtteets out put
What Value resistor
Yes, using a tone control would preserve the integrity of the crossover.
However some speakers such as this one used a unique set of priorities for their crossover. Some have tried redesigning and liked the result.
I'm not sure reworking just the tweeter is possible, but even if it were you've given us no information.
What crossover is there now? What does the tweeter present electrically? Even this is not enough for us to redesign but it might be a start.
However some speakers such as this one used a unique set of priorities for their crossover. Some have tried redesigning and liked the result.
I'm not sure reworking just the tweeter is possible, but even if it were you've given us no information.
What crossover is there now? What does the tweeter present electrically? Even this is not enough for us to redesign but it might be a start.
90% of the recording are fine just once in a while when playing very loud on 50 year old recordings
Doesn't make sense to cripple the speakers for a small minority of recordings.
Get an EQ box of whatever type you prefer, and insert it into the tape loop, or between the preamp and power amp.
Most of these will have a bypass switch that you can use for the better recordings.
Or make your own passive RC filter in a box with a switch, to go between the preamp and power amp.
You could even make the filter adjustable in frequency with a multi-position switch.
One position could be 0pF for the bypass function.
For example, the resistor could be 2k, and the capacitors could range from 0pF (full bandwidth) to 10nF (8 kHz).
Values for tube preamps would be somewhat different. You may prefer even larger capacitors.
Get an EQ box of whatever type you prefer, and insert it into the tape loop, or between the preamp and power amp.
Most of these will have a bypass switch that you can use for the better recordings.
Or make your own passive RC filter in a box with a switch, to go between the preamp and power amp.
You could even make the filter adjustable in frequency with a multi-position switch.
One position could be 0pF for the bypass function.
For example, the resistor could be 2k, and the capacitors could range from 0pF (full bandwidth) to 10nF (8 kHz).
Values for tube preamps would be somewhat different. You may prefer even larger capacitors.
While Ray's advice here is sound (no pun intended 😉 ), if you are intent on tweaking the crossover you might start by taking some crocodile leads and clipping a resistor between the right side of the 2.7 ohm resistor and the negative terminal. Use a value between about 10 to 39 ohms. You could also increase the 2.7 to 4.7
These tweaks appear to be fairly neutral to the response, considering what you're doing, so that you can make a decision. If you prefer one of these we can work on doing it better.
These tweaks appear to be fairly neutral to the response, considering what you're doing, so that you can make a decision. If you prefer one of these we can work on doing it better.
Yes you are correct on Crippling the speakers, On the 800 matrix adding the extra resistor sucks the life out of the sound.
Was surprised on the end result Not good.
Thanks for input
Much easier is to put cloth over the tweeter. Its fully reversible, no need to open cabinet, its cheap and effective. I use used antistitic cloth meant for dryer to remove static. Best after one use. Mount over tweeter by blue masking tape, from top.
For normal recordings, ~90% of the time, lift the cloth back.
Or use eq as all others suggested.
Regarding changing the crossover, you can be concerned about upsetting the blend at the cross and still disagree with the voicing. It takes skill to keep them separated but it's entirely possible. Still, it's easy to test the idea with EQ first.
So the resistor sucked the life out of the sound? It's a complex concept so don't forget that you still want less treble.. I might want to learn what the change did in order to try approaching it from a different angle.
So the resistor sucked the life out of the sound? It's a complex concept so don't forget that you still want less treble.. I might want to learn what the change did in order to try approaching it from a different angle.