"Tired2way" speaker building.

[Starre]

I have tried it tonight and altough it dampens the panel it seems like the difference is small at listening position. It seems the problem is not the back panel but something else. I have a "shouting" effect somewhere around 400-500 Hz that comes through when listening. Have to find out what it is. I have seen a peak at about 500Hz measuring the speakers in room.

 

[Dufus]

You never give up Starre?

 

[Joachim Gerhard]

When you measure a sizable peak it can not come from the cabinet. You could try an LCR trap in the crossover.

 

[Salas]

Can he see same boost in near filed and far field? Mono and stereo? If its far field only it can be room reverberation build up, he is measuring with 1/3 Oct. RTA if I remember correctly.

 

[Starre]

I did a measuring at about 1 meter once and it looked better in that regards so I think and hope it is mostly the room affecting it, I will find out what is the problem with more measuring I am sure. RTA like you said Salas, I will also try full range measurings more careful, I did it once and it did look like a comb filter almost, I could clearly see the room making it hard to measure. And of course I do not give up since I think I can still improve things.
But if I get the explanation to this problem I have that is the end of it. Thanks Joachim, I hope that is not needed.

 

[Starre]

Can a standing wave inside the cabinet cause a peak at about 500Hz? If f=500Hz that gives a wavelenght of 0,68 metre.

 

[Salas]

If it was somewhat shorter it could be related to height mode if not damped enough with padding.

 

[Starre]

Ok, I will try to find out what it is, I still think it is room related, I will get back when I have some info from my measurings.

 

[Starre]

I did two measurings at listening position and in front of one speaker at about 1 metre with both speakers playing white noise. It looks like it is mostly the room since at 500Hz it is first a little peak and then at 1 metre it is a dip.

 

[Starre]

The dip over 16kHz I do not know why it is like that since I have measured before and did not have such a big dip.

 

[Salas]

Hey, that's not a bad real living room RTA response, have seen far worse, no kidding.

 

[Salas]

16kHz, hmm very easy to move the mic, catch some destructive interference, toe in if in stereo, things like that. It beams there and the room absorbs easily. Since you got it before you gonna catch it again.

 

[Starre]

Well it was not that Salas, I found out that when using a borrowed computer it looked just fine and now using a new one I just bought it dips over 16kHz like that! Strange, this computer use windows 7 and the other borrowed one use windows XP which is recommended from the software makers although it is said to work with 7 or XP, and it should be fast enough according to program. No idea if it is that which is making the difference, I have to email them to get an answer I guess.

 

[Salas]

If you will loop through its audio in Arta measurement software line out to line in you will see if it dips. And there is compensation response to make in Arta

 

[Starre]

I sent an email to XTZ about it. Since it use an external sound card and it works perfect with one computer it must be something with my computer that is not as it should, thanks anyway Salas but I will see what answer I get from XTZ. I think maybe my computer is too slow after all, it shows the same level whatever I do with the mic. Anyway, the problem with the "shouting" is the room I am rather sure of now so I have been thinking of maybe trying to move the speakers from that wall and use them on the long side of the room instead. It is 3.80 metres wide so maybe that works. The speakers are probably not to blame here and that is good news. Sorry if I gave the impression of something else.

 

[Salas]

My B&W is going to lose sales now bcs of wrong bad press. Say whatever, we are here for fun.

 

[Starre]

.

 

[Starre]

I have got an answer from XTZ and according to them it can be a setting in Windows that needs changing, I will try that tonight.

 

[Starre]

It was a setting in windows audio that needed changing, everything is working now.
Had to rise quality to "DVD standard".

 

[Salas]

48k sampling?