2426/2405 passive crossover

mantisory · 3rd July 2011, 02:38 PM

Hi everyone,
I just wanted to see if the ideas I have regarding a passive crossover for these drivers are okay...
Both are 8 Ohm drivers, but there is an efficiency difference between the two - the 2426 is 107dB and the 2405 is 105dB (from the JBL site anyway)
I am thinking I would like the crossover point to be around 10k or so, since without the 2405, the 2426 starts rolling off around there.
My main question is, do you think I can get away with just putting a crossover on the 2405 (a simple 2nd order L-R with 1uF / .25mH ), and just let the 2426 roll off naturally?
I am also thinking that the 2dB difference between the drivers may or may not be enough to hear, but if it is I imagine I could just put an L-Pad on the 2426 to knock it down a couple dB?
Thanks for any help or suggestions you may have
Regards,
Byron

mantisory · 4th July 2011, 08:02 PM

I guess it's just not that interesting

b

AllenB · 4th July 2011, 08:53 PM

Perhaps 10kHz is not that interesting

If it were me, I'd try without the 2405.

mantisory · 4th July 2011, 10:42 PM

Thanks, but the roll-off after ~10k is too much.
Byron

AllenB · 5th July 2011, 01:41 AM

Although there is more to a crossover, yes, you could cross it like that. The values you suggested may want tweaking after you listen or measure. The sensitivity difference doesn't sound like it would be a problem.

3rd July 2011, 02:38 PM	#1
mantisory diyAudio Member Join Date: May 2002 Location: toronto	2426/2405 passive crossover Hi everyone, I just wanted to see if the ideas I have regarding a passive crossover for these drivers are okay... Both are 8 Ohm drivers, but there is an efficiency difference between the two - the 2426 is 107dB and the 2405 is 105dB (from the JBL site anyway) I am thinking I would like the crossover point to be around 10k or so, since without the 2405, the 2426 starts rolling off around there. My main question is, do you think I can get away with just putting a crossover on the 2405 (a simple 2nd order L-R with 1uF / .25mH ), and just let the 2426 roll off naturally? I am also thinking that the 2dB difference between the drivers may or may not be enough to hear, but if it is I imagine I could just put an L-Pad on the 2426 to knock it down a couple dB? Thanks for any help or suggestions you may have Regards, Byron

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4th July 2011, 08:02 PM	#2
mantisory diyAudio Member Join Date: May 2002 Location: toronto	I guess it's just not that interesting b

4th July 2011, 08:53 PM	#3
AllenB diyAudio Member Join Date: Oct 2008	Perhaps 10kHz is not that interesting If it were me, I'd try without the 2405.

4th July 2011, 10:42 PM	#4
mantisory diyAudio Member Join Date: May 2002 Location: toronto	Thanks, but the roll-off after ~10k is too much. Byron

5th July 2011, 01:41 AM	#5
AllenB diyAudio Member Join Date: Oct 2008	Although there is more to a crossover, yes, you could cross it like that. The values you suggested may want tweaking after you listen or measure. The sensitivity difference doesn't sound like it would be a problem.

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