Expert Advice Wanted Here

[andromedaaudio]

This is basically an advantage of the big wilsons I would say , by aiming the MTM units at a certain angle , you can get a response very close by which one could not achieve with " straightfiring " units , to optimize such a speaker I think it would be good to check the response after set up with a measuring tool, because ears can be fooled , and by also adjusting resistors accordingly
But at a certain far away distance the need to angle becomes less, another reason could be that wilsons mtm is stacked on two big woofers basically which places the mtm automatically quite high and you need to be creative in order to get a believable soundstage

 

[jcmusic]

Ok here is where i ended up after trying some new things today... It sounds good and i like it and the curve looks alot better.

 

[andromedaaudio]

Yep much better , although it looks like you need to tune down the tweeter ?output a little more around 3000 hz, besides that a +- 2,5/3 hz over a wide part of the audioband

 

[jcmusic]

What do you mean by +- 2,5/3 hz???

Yep much better , although it looks like you need to tune down the tweeter ?output a little more around 3000 hz, besides that a +- 2,5/3 hz over a wide part of the audioband

 

[andromedaaudio]

Besides the little bump at 3 kHz .
If you draw a horizontal straight line through the middle of your response, from let say 200 hz to 10 kHz it deviates + 3 db and - 3 db from that middleline , 200 hz - 10 kHz is an important part of the audioband off course which goes from around 20 hz - 20 kHz

 

[jcmusic]

Well i plan on fixing that 3khz area next time I have a chance to measure but, as for the rest i though that being within 5db + or _ would be considered flat and good enough...

 

[Vapor1]

That's a huge difference from your first measurement, what did you change? Is it actively crossed over?

 

[jcmusic]

No I am using a passive xover in both speakers, I moved the LP around till I found the best curve I could then EQed from there.

That's a huge difference from your first measurement, what did you change? Is it actively crossed over?

 

[jcmusic]

Ok here the result after working on that 2khz hump, and the subs turned up a bit!!!

 

[Vapor1]

No I am using a passive xover in both speakers, I moved the LP around till I found the best curve I could then EQed from there.

While it probably is an improvement, things like the suckout caused from poor phase alignment and summation at 400hz cannot be fixed with EQ. You can make it look fixed in a measurement, but the phase is no more aligned now than it was before. But if you mean by "moved the LP around" that you actually changed the crossover components to get things flat first, then EQ'd, you're probably in pretty good shape. It's still impossible to say if you have proper summation without measuring the raw individual drivers and extracting minimum phase, then running a simulation. But that's a whole new ballgame

Basically, it looks like an improvement for sure, but keep working and learning!

 

[jcmusic]

Not sure what you mean by changing xo componets but, what i moved was the Listening Position to get the curve as best i could then eq. What exactly is a suckout how does it look? What kind of phasing issue are you talking about?

 

[jcmusic]

So here is where I am today...

 

[marin]

Just read this thread today and have one observation:
Mid/tweet impulse responses for left and right speakers seem to be taken with reversed polarities.
Is that only a measurement hookup related issue, or are you actually listening to music like this?
My guess is, that it's mesurement hookup related, because the above frequency response of combined left/right speakers should look a lot worse if taken with reversed mid/tweet polarities.
Please clarify the situation.
Regards, Marin

 

[marin]

Just found your newer post now, which seems to answer my question (it was a measurement setup issue).

 

[jcmusic]

I learned about the polarity when I was taken measurements it is all correct now.