prefered crossover freq for scan speak 9500's

[D1GGY]

This seems to be quite a popular tweeter, i aminterested in your prefered crossover frequency for use in a small two way speaker 14L Cabinet.

The woofer is a seas 17rcy-p, i am not convinced by the sound (seems thin but vocals are great )

so, i thought that the cross over frequency may be incorrect, and maybe the tweeter needs to be attenuated, the bass may be there but to quite compared to the higher frequencies.

I do not know what the cross over is at the moment is is borrowed from a pair of Gale two ways, hence my thoughts about doing the crossover properly. or am i trying to make a silk purse from etc etc etc...

or are the seas not suitable for this aplication 9 they were recomended to me as replacemnt for the ex002!! )

Mark

 

[navin]

2.5k 12db can be a good startig point

BTW i thnk the 9500 is too expensive for teh P17. maybe the PL18 from vifa or 8545 from SS is better suited

 

[D1GGY]

Thanks, for your advice, will some thing like winisd be ok for working out the component values?

also i guess that you do not want the crossover freq to be the same for the low pass as the high?

Please excuse if these are simplistic questions, i am just starting!!

I think i will start with the crossover to go with the woofers i have and look at the others on model software, what sort of response / shape are you looking for on the graphs, smooth or going for lowest frequency at the -3db point 😕


Mark

 

[D1GGY]

😱 😱 😱 😱 WOW 😱 😱 😱

i have just removed the naff crossover and put a simple 4uF cap on the tweeter...............i didn't realise the tweeter was that good...

right must order parts for the crossover........hmmmm and mayby new woofers and cabinets.....

ho hum i guess i have been lurred into this amazing world!!! 😉

 

[navin]

I used Lsp Cad

 

[Jean]

2k active 24db/octave LR crossover, also used 2.2k butterworth 2nd order electrical. Midbass is pl18wo that I like more than the p17s. Now I am adding scanspeak 10" to the mix .

Oh, nice tweeter isn't it ? 🙂

 

[navin]

nice tweeter. have you tried teh M series of woofers from Vifa. I prefer the M18 to the P17.

 

[Jean]

Navim,

No, the only two that I have are p17wj and pl18wo. I am going with the 8545 next, and maybe ss9700. Then again, I would like to try vifa xt25 crossing it high with a small mid like 8640 or smaller revelator mid . So many choices ....

 

[navin]

let me know what you choose i have the same dilema.

 

[Jean]

Navin,

I was reading midrange distortion tests data on Linkwitz page and currently thinking about trying the seas w18e midrange in place of the pl18wo in sealed cabinets. Thats my next upgrade 🙂

Jean.

 

[D1GGY]

hi sorry been away for a while. i changed jobs and my Inernet access was company owned 😉

right i seem to be going in the right direction (or am I ???) the thin sound seemed to be coming from "too much" tweeter,

I have put a resistor in series of 25 ohms to attenuate it. I am now concerned that my initial crossover is way out, is this too much resistance for the tweeter?

The cross over is a second order with 1 off 4.7uF caps and 1.02 mH inductors for the tweeters and the same again on the woofer. (clearly in different configurations ) these values were used from a calculation website i found.

Instead of using such a large resistance is there another way, i am sure this has removed some of the "sweetness" of the tweeter.

mark

 

[navin]

try a Rp of 10 ohms and a Rs of 4 ohms for a start. reduce Rs and increase Rp accordingly.

remember that the effective impedance of teh tweeter and L pad must be used for teh XO freq.

ex: 8 ohm tweeter, 8 ohms Rp, 2 ohms Rs gives 6 ohms that the XO "sees".

Rp is reisitance in parallel with tweeter, Rs is resistance in series with combo or tweeter and Rp.

hope this helps.

 

[D1GGY]

thanks navin much appreciated.