hows this graph

[thisisvv]

this is a graph from scanspeak 1531g and raal 140-15d.....it is connected to active XO and they are getting from 70-1800hz to Scanspeak and 1800 hz -20Khz raal....

Right now the woofer is not connected which is big AE 15 ...will be connected later...this test was for Scan speak and Raal

 

[wintermute]

Hi thisisvv, please give some information about the measurement. First impression is that this includes room effects. Based on the picture I would suggest getting as far from walls and other objects as possible, with the tweeter at a height that is close to half way between floor and ceiling.

Unless of course you want to do listening position measurements.

Tony.

 

[thisisvv]

Hi thisisvv, please give some information about the measurement. First impression is that this includes room effects. Based on the picture I would suggest getting as far from walls and other objects as possible, with the tweeter at a height that is close to half way between floor and ceiling.

Unless of course you want to do listening position measurements.

Tony.

yes i like maeasurement at listening position...may i ask what what other information you need...

V

 

[Jay1111]

Depending on the accuracy of those measurements, the woofer is about 4 db hotter then the tweeter from about 200hz to the xover

 

[Michael Chua]

this test was for Scan speak and Raal

According to your plot, there is a notch at about 2,200 Hz. Have you tried reversing the polarity of the Raal. Presently, it could be out of phase.

Regards
Mike

 

[thisisvv]

According to your plot, there is a notch at about 2,200 Hz. Have you tried reversing the polarity of the Raal. Presently, it could be out of phase.

Regards
Mike

is it possible using Active amp... i know its possible using Passive XO...

i will change the polarity and see


V

 

[wintermute]

Hi thisisvv, information about what sort of measurement it is (in room is a good start). Whether it was pink noise, what smoothing was used (I'm assuming it is not gated). etc are usefull.

It would also be useful to see a gated measurement at around 1M with the speaker as far from any objects as you can get it. This will then make it more obvious what is inherently the speakers response, and what are the room contributions

Tony.

 

[siruis815]

The bump at ~260Hz could be a resonance from the U frame, no? Possibly just rising response due to OB.

 

[wintermute]

Actually I just realised this is an OB speaker (which I'm not at all familiar with measuring) so the comment about a gated as far from anything as possible may not make sense.

Tony.

 

[siruis815]

Gated measurements can be taken regardless - there still could be influences from reflections seen in the graph. But of course if complete listening position measurements are desired, gated ones may not be required.

OTOH - The current mic position sure seems like an odd listening place.

 

[Michael Chua]

is it possible using Active amp...

I'm not sure what you mean by Active amp but if there's an electronic crossover somewhere in the signal chain, it's possible that one of the outputs is in reversed phase. Another cause could be the Raal + terminal is actually -.

If you flip the polarity and the notch deepens further, then it's not the phasing. It may well be that the Raal cutoff is higher then the crossover frq.