Crossover for 2405 16 Ohm

Hi,
im looking for a crossover-schematic 7500 Hz 12 or 18 db for the 2405 16 Ohm.

Can somebody help?

Thank you for the answers.

BestRegards

Dieter

You might want to look at the 3106 or 3107 high pass filters

http://www.jblproservice.com/navigat...chematics.html

The "best" is probably the 3145 or 3155 high pass filter.

Hi Giskard,

thank you.

In the "frequency dividing Networks" pdf JBL says, that the 3105 and 3106 is for 16 Ohm.
But in the:
http://www.jblproservice.com/pdf/Net...%20Network.pdf

JBL say it is for 8Ohm.
Am i wrong?

In:
http://www.jblproservice.com/pdf/Net...%20Network.pdf
JBL says it is for 16 Ohm
What is about this network for he 2405?


In:
http://www.jblproservice.com/pdf/Net...%20Network.pdf

JBL says it is for 8Ohm.

Thank you Giskard: you are very helpful.

Dieter

I think you are referring to the test loads in the network service bulletins. JBL has to have a standardized way to test networks and the answer is:

http://www.jblproservice.com/pdf/Net...%20Fixture.pdf

If you are measuring the voltage drive of a network LOAD Z tells you what to load the network with to obtain the values in the table:

Quote:

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Originally posted by Dieter
Hi,
im looking for a crossover-schematic 7500 Hz 12 or 18 db for the 2405 16 Ohm.

Can somebody help?

Thank you for the answers.

BestRegards

Dieter

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I am using the 3155 circuit and it really allows the 2405 to sound great.

Don't worry about it being referred to as an 8 ohm circuit. JBL is a bit weird about driver impedance. Since the 2405 is not as low an impedance as a true 8 ohm device they have been referred to as 16 ohm drivers. The actual impedance at the crossover region is more like 10 ohms I believe. For some reason they have also been referred to as 8 ohm drivers in other years.

JBL has only made one impedance of the 2405/2405H even though the name plates say 8 or 16, and the JBL circuits are also labeled some 8 and some 16.

The 3145 and 3155 crossovers are much more recent designs than the 3107 or 3108 and in my opinion are vastly superior. I realize that these are both crossed over higher than your stated 7500Hz, but the 2405 sounds better crossed over higher.