Tweeter Selection for B&W Matrix 800

[dosik2]

It is difficult to measure large speakers, but you are primarily interested in the response of medium and high frequencies, and that part is not large. The tweeter and two mid drivers are relatively close. You can measure at 1m in the axis of the tweeter, at 1.5m, at the listening position, out of axis, etc. You have gating in the measurement to turn off everything below 200-300Hz to make measurement more realistic above 1kHz, etc. I say again, download Holmy Impulse, it's the easiest for the first time. REW is much more complicated because there are many options.

Thanks a lot for help. I will keep your instructions in mind.

 

[dosik2]

Third option: Improve the compatibility of your chosen amp and speakers. This could be achieved by an impedance correction in parallel to the speaker. Maybe the aforementioned RC circuit is already enough. Maybe not. Measurements and some learning may be needed.

Regards

Charles

I see. I will take note of your comments too.

 

[dosik2]

If the sensitivity of the mids is actually above 93 dB
If the specs account for peaks or trying for best published
numbers. Which is likely.

It would be minimal to no padding needed for the tweeters

Luckily the documentation is good from the pdf posted in post #91
The mids are already padded very slightly. So the factory crossover
is already padded and has component locations to fine tune any padding
needed.

Look as if one mid is crossed lower , which is good for vertical.
It could be somewhat not as painful to fix the high Q on the high pass.
and change the lowpass to blend with, new tweeter added.
Least it is not a complete shot in the dark, no reverse engineering is needed
the documentation is good.

View attachment 1460439

Thanks for your explanations.

To be honest, I cannot yet understand 100%
what you explained. But, very helpful for me.

 

[Lojzek]

This modification should reduce the tweeter level some 2dB assuming amplifier output impedance in the range of 2 ohms,
even more the greater the OI.

 

[Freedom666]

r1 could be bypassed with 0.47 or 1uF more linear above 15khz

 

[Freedom666]

maybe r1 could be 3.3 ohms instead of 2.7 ohms without much changing the filter curve.

 

[temp25]

This modification should reduce the tweeter level some 2dB assuming amplifier output impedance in the range of 2 ohms,
even more the greater the OI.

View attachment 1460458

Just out of curiosity, what would my estimate of a 4uf cap, and 12 ohm resistor look like? I was going for about 8 ohms up top.