How to change padding in crossovers?

[Jakob]

Hi all. I got this crossover layout from a fellow forum-member. In his setup he uses a LE14H-3 for the lows and a 2435 for the highs. I really like the sound in the HP-part on my 2435's but since I'm using ME150's for the lows I need to increase the output from the 2435 (the ME150 has about 5dB more output than the 14") Am I right in assuming that increasing the value of R7 also will increase the output of the 2435?

Thanks for any help on this!


Regards,

Jakob

[Robh3606]

Hello Jakob

You could try these values from LEAP. I seems to give you about 5db more or less across the board

Rob

[Mr. Widget]

Interesting... I came up with R6~ 5.75 ohms and R7~ 3.125 ohms.

His original pad seems to indicate an assumption that the driver is a true 8 ohms, did you use an actual impedance plot?


Widget

[CauYem]

Here is the plot of both response & impedance of the original crossover, and the new circuit, which I removed almost 2/3 of the components used in the original circuit. Dotted line is the response of the simplified circuit.

The new, simplified circuit will work with your ME1500 since it lowers the attenuation level of the 2435 to match the high output ME1500. Try it and let us know.

[jerv]

I once designed a prototype 2435 - with H9800 horn - filter for a fellow member. Using his actual measurements data and impedance plot (which I luckily hadn't deleted), I came up with these new values (without altering any of the other components):

R6 6,8 ohm
R7 3,3 ohm

According to my simulatuons in lspCAD, this gives almost exactly 5dB more overall level, without altering the frequency response. Se attached graph:

[Zilch]

Here is the plot of both response & impedance of the original crossover, and the new circuit, which I removed almost 2/3 of the components used in the original circuit. Dotted line is the response of the simplified circuit.

Cool! You removed all of the HF comp.

It only took us three years to put it in there....

[Robh3606]

did you use an actual impedance plot?

Hello Widget

Yes it works out to about 6 ohms. The calculated values were tweeked to standard values. I used an Array Horn Imp plot

Rob

[4313B]

Cool! You removed all of the HF comp.

It only took us three years to put it in there....

If I recall correctly he doesn't like Greg's filter designs due to their impedance loads.

Incidentally, he just bought Greg's Array horns and 435Be's so maybe we'll see what he comes up with.

[Robh3606]

Incidentally, he just bought Greg's Array horns and 435Be's so maybe we'll see what he comes up with.

Well if that's the case I am curious as hell. Gregs basic filter has that horn's name on it. It dials right in. I would be interested to see a different approach.

Rob

[Mannermusic]

Hi all. I got this crossover layout from a fellow forum-member. In his setup he uses a LE14H-3 for the lows and a 2435 for the highs. I really like the sound in the HP-part on my 2435's but since I'm using ME150's for the lows I need to increase the output from the 2435 (the ME150 has about 5dB more output than the 14") Am I right in assuming that increasing the value of R7 also will increase the output of the 2435?

Thanks for any help on this!


Regards,

Jakob

http://www.diyaudioandvideo.com/Calculator/LPad/

[4313B]

Gregs basic filter has that horn's name on it. It dials right in.

Yes it does.

The prototype 1200 Array system is arguably the best loudspeaker system Greg has designed to date.

[Jakob]

Thank You all for the help. This forums members will to help astound me and I'm very grateful.
During the week to come I will test the different values and see where I end up. I'm also going to build the LP-part of the N3100 for the ME150. Could be an improvement as well. Will post results from listening tests in this thread later on.

Thanks again!