Tweeter Selection for B&W Matrix 800

[Netlist]

Stefano, you haven't seen the build quality, I presume. 🙂

 

[diyiggy]

For sure all the lythics drifted... You have to measure that. Can be also the mid peaking you can hear in the trebles due to alterations of drivers datas and filters.

Can help to know waht is pluged before till to the source used.

 

[Netlist]

For sure all the lythics drifted...

There are no lythics. 🙂

 

[Lojzek]

Hi, everyone!

I am planning to replace the tweeters of my B&W Matrix 800 speakers.

In all likeliness, tweeters are the last thing needing replacement, meaning they would be faulty.

 

[NIXIE62]

I'd start from the beginning, i.e. swapping R1 for 3R3 and higher : Mox or classic cement.

pictures of the model ?

The treble is too prominent, and should be muted. However, along with that, some changes will be needed on the crossover, because it is poorly integrated with the midrange. And that will be difficult without measuring equipment. With that DC resistance, the tweeter is practically 6ohms nominal impedance. And as far as I can see from Stereophile measurements, there are also some high-pitched rings on two frequencies.

 

[diyiggy]

I 'd try it. It is too much flat.
It doesn t need to be perfect for a POC, Simple as that.
Of course a proper measurement would be great.

 

[temp25]

The OP has a mic. I think with careful steps, an improvement can be made. It's not rocket science, and a 30 plus year old design is not perfect just because a writer at Stereophile loved it way back then.

 

[diyiggy]

Makes sense.

 

[dosik2]

You could mount a new tweeter on the existing faceplate but it's a lottery to find one that is suitable. Even then it would require crossover changes. Best to try some changes in the crossover and could be as simple as increasing the padding, or add a 15R-22R resistor parallel to the tweeter, or a parallel CR to tilt down the top octave. As a test you could try the Yamaha NS-10M trick by placing a tissue over the tweeter to reduce the treble edge.

Don't get hung up on the published FR as can be misleading. Lifting the 2-4kHz dip could make the speaker sound more harsh and introduce fatigue. A lot of speakers have this dip and it's there for a reason to make it more pleasant for the ears.

Check to see if the harshness is coming from the tweeter by disconnecting it as a lot of times it comes from the mid driver.

I was searching for tweeters that might fit into the existing faceplate. But, it is difficult to find one because both the hole diameter and screw locations must match.

I generally don't like to alter the values of crossover components while I often changes capacitors with different ones with the same values. Regarding 2-4kHz dip issue, I mentioned it because I was a little reluctant to try to alter crossover without changing tweeters because original design must have reasons for the values.

I haven't thought that the harshness might be coming from mids. I will think about this possibility too.