Does Bi-Amping with F5 for the lows and AlephJ for mid/high make sense? - Page 4 - diyAudio
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Old 21st September 2013, 07:11 PM   #31
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Originally Posted by KatieandDad View Post
The F5 is a bit light for bass use, at only 25W an F5 turbo would be better.

I've got a Dr White 150W for bass duties. Aleph 4 (100W) for mids and F5 (25W) for highs.
Hi
I am using the F5 purely as a midrange/top amp; the K2 which can deliver over 500 watts should handle the bass side of things.
I have tested the K2 as a full range amp and it really is pretty poor above the bass region but it can certainly deal with anything I throw at below 300 Hz

George
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Old 21st September 2013, 07:31 PM   #32
Einric is offline Einric  United States
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As soon as my Tubelab Simple P-P is completed I will be using my F4 to drive the woofers and the P-P EL84 to drive the tweeters.
The F4 will just slave off of the speaker outputs to it's input, Nelson described this application in the F4 Manual.
I will be using the existing passive crossovers, that way I have the benefit of matching gain between amps with a single volume control.
At some point I will build some Passive LL Crossovers and use my tube preamp to drive my F4, Then I will have to rig up a common volume control.
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Old 22nd September 2013, 11:55 AM   #33
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Originally Posted by Einric View Post
As soon as my Tubelab Simple P-P is completed I will be using my F4 to drive the woofers and the P-P EL84 to drive the tweeters.
The F4 will just slave off of the speaker outputs to it's input, Nelson described this application in the F4 Manual.
I will be using the existing passive crossovers, that way I have the benefit of matching gain between amps with a single volume control.
At some point I will build some Passive LL Crossovers and use my tube preamp to drive my F4, Then I will have to rig up a common volume control.
Can you describe what slaving off the speaker outputs means? Is it sorta similar to speaker level vs. line level?
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Old 22nd September 2013, 12:31 PM   #34
Itsmee is offline Itsmee  England
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Originally Posted by Einric View Post
As soon as my Tubelab Simple P-P is completed I will be using my F4 to drive the woofers and the P-P EL84 to drive the tweeters....
I will be using the existing passive crossovers....
I would be very cautious of doing that, the tube amp will be unloaded below the crossover frequency, thats not good for the output.

Build an active crossover (with gain for the F4), and connect the drivers directly to the amps.
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Old 22nd September 2013, 12:43 PM   #35
AndrewT is offline AndrewT  Scotland
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I would be very cautious of doing that, the tube amp will be unloaded below the crossover frequency, thats not good for the output.
..............
Yes.
Use a passive filter at the input of the tube amp to band-limit it, to suit what the output loading will be.
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Old 23rd September 2013, 04:59 AM   #36
Einric is offline Einric  United States
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I would attach the speaker outputs of the Tube amp to the Tweeter passive circuit and the the RCA inputs of the F4 just as the F4 manual shows.
This way the tube amp would handle the tweeter and the F4 would handle the woofer.
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Last edited by Einric; 23rd September 2013 at 05:01 AM.
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Old 23rd September 2013, 08:12 AM   #37
Itsmee is offline Itsmee  England
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Einric,

I think you have missed the point of the previous two posts, which leads me to believe that you are not familiar with their use, and how not to blow valve (tube) amps up.

Quote:
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....the tube amp will be unloaded below the crossover frequency.....
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Old 23rd September 2013, 01:34 PM   #38
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Originally Posted by wuffwaff View Post
for better bass control you could also try to raise the ac-current-gain of your AlephJ a bit (say to 60% or so). This is an easily done and could save an extra amp.
William, would you please tell more about this?
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Old 25th September 2013, 09:49 AM   #39
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Hi,
I started the active crossovers back when old colony sound and audio amature was king!
They offered a kit for a active 3way crossover,Well I found you could drive any speaker to do all most any way you wanted it to respond with active crossovers and a little EQ would bring in the rest,I never went back to a caps and resistor,coil type crossover,You build them after you design them and see if it hit the mark,or crossover as designed,With active just tweak a slider or a knob, your home.
It to me also sounds so much better,Clearer and bass got plenty of punch because one amp has only got to cover one speaker and a narrow amount of frequency,
I have built a 4 way active Welings DSP to DEQ2496 to DCX 2496 toB1's into F5 for tweeters F5t for mids,ba3,for upper bass,and and 2 class D's pushing 2 of Xoc1's 18" subs,Most people say that's the clearest sound they have ever heard,Their words not mine,This is the second time around for this ,I used chip amps first,kinda digital sounding,but great for techno,ok for Rock,
Just my 2 cents, so try it with 4 amps ,a full range speaker and a woofer and a 2 way per channel active crossover before the amps,make your assessment ! also the PS supply caps need to be fastest for the upper freq, and Lots of uf for the bottom end amp,makes a difference.
Ticktock read nelson's article on sweet spot,it gave me insight for rail V and bias settings,
Cheers,
NS
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Old 1st October 2013, 10:46 AM   #40
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Problem with active systems is the use of a less than transparent device. Even a simple two way active crossover can cost a ton for one that does not disrupt the signal. Of course an active system has benefits if one is capable enough to tailor it all without giving up the signal clarity. I tried both a regular and heavily modded DCX2496, as well as a DEQX. I never cared for the sound that they impart on the music. Of course I love the benefits for diy type setups, but that's where the fun ends...just my .02. Besides, one can use a little eq via PC without any ill effects...I have the largest issue with crossovers and losing the synergy as was designed by the designer...of course, a too many speakers have such terrible issues one may as well re-design the entire crossover going active or even doing a new passive...but that's not why I purchase a speaker.
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