Proac crossover - Page 4

Galu · 29th September 2019, 06:33 PM

The capacitor in parallel with the ATC SM 75-150 shown in post #26 should be 4.7uF and NOT 15uF.

Galu · 29th September 2019, 07:17 PM

WAIT A MINUTE!

I've just spotted a mistake in one of Datsun's component values in post #10, which I've been wrongly working with!

The rule is that if the driver impedance is halved then the inductor value should also be halved and the capacitor value should be doubled.

Thus, referring to the original crossover scheme the midrange components should be changed to:

C3 = 47uF, L2 = 0.65mH, L3 = 0.45mH and C4 = 18uF

So its neither 4.5uF or 15uF, but should be 18uF.

Hope this finally clears things up!

Galu · 29th September 2019, 07:24 PM

P.S. Since 18uF is not a standard value, you will have to approximate it by wiring two capacitors in parallel e.g. a 10uF and an 8.2uF.

Galu · 29th September 2019, 08:05 PM

Or, more sensibly in your case, put a 3.3uF in parallel with your existing 15uF!

Please let me know how it goes.

Datsun · 30th September 2019, 02:48 PM

Quote:

Originally Posted by Galu

C3 = 47uF, L2 = 0.65mH, L3 = 0.45mH and C4 = 18uF

Sorry, this is my typo - the shunt capacitor should be two times the nominal value - 18 μF. ((
I sometimes use LC_Filter.

miguelnoda · 30th November 2019, 12:43 AM

The crossover in the middle and lower part works very well with these new values but the upper part sounds advanced and with sound as distorted or with grain I would like to attenuate or sound without being ahead of what I could do, insert some resistance?

Galu · 30th November 2019, 02:08 AM

If the treble is too strong, then try increasing the value of the tweeter resistor R1 to 4.7Ω.

A higher value such as 5.6Ω or 6.8Ω may be necessary - work your way up if required.

If that proves unsatisfactory, then report back.

AllenB · 30th November 2019, 02:22 AM

You want the sound to be the same as the original...

I think you should leave the woofer and the tweeter crossover original. Then compare the 8 ohm and 16 ohm response so you can create the difference. You must also compare the 8 ohm and the 16 ohm impedance vs frequency. This is much easier to do with a simulator.

miguelnoda · 6th December 2019, 07:23 PM

the sound with that grain in the high part was suspicious to me that the d2010 were distorting I had the opportunity to try others and they no longer do it, I think that with the Wilmslow Audio filter they lowered the frequency cut a lot and broke down.
now they work well but I would like to put some better twetter
They could advise me with the same characteristics or modifying the croossover.
Cheers

30th November 2019, 12:43 AM	#36
miguelnoda diyAudio Member Join Date: Oct 2009	Crossver proac ebs The crossover in the middle and lower part works very well with these new values but the upper part sounds advanced and with sound as distorted or with grain I would like to attenuate or sound without being ahead of what I could do, insert some resistance?

6th December 2019, 07:23 PM	#39
miguelnoda diyAudio Member Join Date: Oct 2009	crossover proac ebs the sound with that grain in the high part was suspicious to me that the d2010 were distorting I had the opportunity to try others and they no longer do it, I think that with the Wilmslow Audio filter they lowered the frequency cut a lot and broke down. now they work well but I would like to put some better twetter They could advise me with the same characteristics or modifying the croossover. Cheers

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29th September 2019, 06:33 PM	#31
Galu diyAudio Member Join Date: Apr 2018	The capacitor in parallel with the ATC SM 75-150 shown in post #26 should be 4.7uF and NOT 15uF.

29th September 2019, 07:24 PM	#33
Galu diyAudio Member Join Date: Apr 2018	P.S. Since 18uF is not a standard value, you will have to approximate it by wiring two capacitors in parallel e.g. a 10uF and an 8.2uF.

29th September 2019, 08:05 PM	#34
Galu diyAudio Member Join Date: Apr 2018	Or, more sensibly in your case, put a 3.3uF in parallel with your existing 15uF! Please let me know how it goes.

30th November 2019, 02:08 AM	#37
Galu diyAudio Member Join Date: Apr 2018	If the treble is too strong, then try increasing the value of the tweeter resistor R1 to 4.7Ω. A higher value such as 5.6Ω or 6.8Ω may be necessary - work your way up if required. If that proves unsatisfactory, then report back.

30th November 2019, 02:22 AM	#38
AllenB diyAudio Member Join Date: Oct 2008	You want the sound to be the same as the original... I think you should leave the woofer and the tweeter crossover original. Then compare the 8 ohm and 16 ohm response so you can create the difference. You must also compare the 8 ohm and the 16 ohm impedance vs frequency. This is much easier to do with a simulator.