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An illustrated guide to building an F5
An illustrated guide to building an F5
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Old 30th May 2018, 01:18 PM   #991
adason is offline adason  United States
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Yes, thanks for the link, i read it before. It did not answer my question though.
I got F5 behaving well on the floor, no problem. Before i embark on puting it into box, i need to decide on the pot. I use these amps with active crossovers and its usefull to have way to adjust each section separately.
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Old 30th May 2018, 02:08 PM   #992
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by adason View Post
I use these amps with active crossovers and its usefull to have way to adjust each section separately.
Do You bi amplified or tri or more voices configuration system ?
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Old 30th May 2018, 02:22 PM   #993
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by adason View Post
Yes, thanks for the link, i read it before. It did not answer my question though.
Link was not intended to answer Your question no doubt :

An illustrated guide to building an F5

Precise answer(s) to precise tech questions :

What audio source output and preamp output impedance is ?
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Old 30th May 2018, 03:22 PM   #994
Kosst Amojan is offline Kosst Amojan  United States
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I got it sorted out. The higher rail voltages were pushing the current protection BJT's into conduction and drawing off the voltage. I pulled them out and it's been running like a champ.
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Old 30th May 2018, 04:55 PM   #995
adason is offline adason  United States
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Quote:
Originally Posted by Soundhappy View Post
Do You bi amplified or tri or more voices configuration system ?
My two main systems are both bi-amplified. Typically I split the signal at ~160Hz, sending higher pass to high quality class a amp for mids and tweeters section. I leave passive crossover for tweeter and breakup cure for mid in place, if there.

Lower pass below goes to any class ab amp, powering the woofers, typically without any passive crosover, saving on the coils.

I do like to have aditional volume controls on each amp, not just master volume on the active crossover. This allows to use speakers with different efficiencies. Typically you adjust woofer section litte higher without any need for lpads in mids and tweeter. No need to waste class a output.

I have made quite a number of active crossovers recently, and now i am quite satisfied. I am already looking to build 3 or 4 way one. I can't stand the opa based active crossovers, somehow they sound different.
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Old 30th May 2018, 06:56 PM   #996
chrisb is offline chrisb  Canada
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Ed - I think it's been a while since you updated either of the listed blogs - care to share details on your experimentation with active XO's? I deduce from your last sentence that these are not ready made commercial products?
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Old 30th May 2018, 08:33 PM   #997
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by adason View Post
My two main systems are both bi-amplified.
Look at on B2 type of the circuit with adaptation for active crossovers

FIRST WATT B2
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Old 30th May 2018, 09:51 PM   #998
adason is offline adason  United States
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Quote:
Originally Posted by chrisb View Post
Ed - I think it's been a while since you updated either of the listed blogs - care to share details on your experimentation with active XO's? I deduce from your last sentence that these are not ready made commercial products?
chrisb, i wish i had time...i am so far with my blogs that i would have to spend weeks to catch up

Lets see, briefly, main system has volume pot, jlh buffer, passive upper pass (just a cap and resistor out), active lower pass with ebay subwoofer circuit, with mods by andrea ciufoli

Second system has volume pot, kaneda upper pass (i have a thread about it), lower pass is ebay stuff as above.

Third active crossover is in use in my diy audio room, has volume pot followed by simple jfet buffers, feeding passive upper and lower passes. Sounds great actually, inspite slightly higher distortion than above two.

My measuring capabilities are limited, but i collecled some spectrum data.

Last few days i optimized crossoved for little bookshelf, AC130 with Benton planar. I will post fr sweep, pretty amazing.
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Old 30th May 2018, 10:18 PM   #999
adason is offline adason  United States
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Here is little bookshelf i was having fun with, still work in progress, but already amazing.
And the fr response, on axis and each ten degree to 40...not perfect i know, just that last region, but still pretty impressive.
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File Type: jpg DSC_0190.jpg (1,016.7 KB, 217 views)
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Old 30th May 2018, 10:33 PM   #1000
adason is offline adason  United States
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Sorry about sideways picture...

The reason why i was asking about volume pot before F5, because it would made life easier. I build two sets of ACA, and i know for sure simple pot can not be placed on the input. Sometimes extra complexity involved is not worth it.
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