The 400 and 800 hz use the same cap values so I would just interpolate the values for the resistors and then check using the spice program of your choice. You can tweak as needed in Spice to get the precise response that you want.
The interpolation factor is 22% so chose values 22% of the way between the 400Hz values and the 850Hz values.
The interpolation factor is 22% so chose values 22% of the way between the 400Hz values and the 850Hz values.
I have tried to estimate, but do not find the interpolation factor to be constant.
Spice is unknown to me. I have been building many amplifiers etc. from schematics, but my theoretical knowledge is very limited. So here it stops.
Still have a hope to avoid spending $4000 on a Marchand crossover.
Anyway all replies are appreciated.
Spice is unknown to me. I have been building many amplifiers etc. from schematics, but my theoretical knowledge is very limited. So here it stops.
Still have a hope to avoid spending $4000 on a Marchand crossover.
Anyway all replies are appreciated.
Good you mention this as I don't want to introduce distortion.
It's a problem that the schematics I have seen are missing attenuators which should be a natural part of a crossover. I purchased the TCJ Filter Program, but not even there is an attenuator circuit shown.
I have no idea how this shall be done, can you explain?
It's a problem that the schematics I have seen are missing attenuators which should be a natural part of a crossover. I purchased the TCJ Filter Program, but not even there is an attenuator circuit shown.
I have no idea how this shall be done, can you explain?
Steve Bench's crossover, or can TCJ Filter Designer make it better?
What is a CF?
May be it is better that I make a buffered 12dB 500HZ Linkwitz-Riley filter with TCJ Filter Designer.
It suits my Altec Voice of the Theatre better.
Will the signal be attenuated without deterioration with that buffer stage ?
I am now also thinking about making a new tube line amp integrated with a tube crossover.
Any opinions/suggestions?
What is a CF?
May be it is better that I make a buffered 12dB 500HZ Linkwitz-Riley filter with TCJ Filter Designer.
It suits my Altec Voice of the Theatre better.
Will the signal be attenuated without deterioration with that buffer stage ?
I am now also thinking about making a new tube line amp integrated with a tube crossover.
Any opinions/suggestions?
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Steve Bench's crossover - signal attenuation problem
Easy solution, but are you sure it doesn't deteriorate the signal.
Easy solution, but are you sure it doesn't deteriorate the signal.
LF/HF level controls
I had a friend build a stereo version of this crossover and I insisted he installed output level pots. He did and I found hum problems when I put it in the system.
I now have tube amps that have level controls on their inputs and I'll be removing the pots and try that to see if the hum problem goes away or not.
I should be able to post here near the end of Sept when I have time to remove the pots and install in a system.
Sorry it will be so long, but I have too many other irons in the fire att.
Regards, Ron
I had a friend build a stereo version of this crossover and I insisted he installed output level pots. He did and I found hum problems when I put it in the system.
I now have tube amps that have level controls on their inputs and I'll be removing the pots and try that to see if the hum problem goes away or not.
I should be able to post here near the end of Sept when I have time to remove the pots and install in a system.
Sorry it will be so long, but I have too many other irons in the fire att.
Regards, Ron
CF = Cathode Follower. Non inverting unity(ish) gain buffer. Essentially each stage of Steve's crossover is a CF with tricky feedback arrangement to get the 3rd order filter. I am suggesting that you use one to buffer any gain controls so that changes in load or source impedance don't muck with your response... or just rely on the gain controls on your power amps.
The more I talk audio on the web the less sure I am about anything. Input pots on your power amps would be the best solution but if you don't have those then use output pots on the crossover. With reasonably short interconnects it shouldn't be a problem but if it is then use a CF like mashaffer said.
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