Improving on X-BosoZ to mate the F4

[steenoe]

The X-BosoZ hasn't got a lot of gain. Actually it has problems driving several amps to full output, or clipping!
I just had a thought; would it be possible to daisy-chain 2 (two) NS10 modules to get enough gain to feed the F4? Apassgear's NS10 schematic attached. Might be the answer, until something else shows up.
Other ideas and suggestions are welcomed too

Steen

[cviller]

I don't think you'll be able to get much more voltage swing - at least not with the 24V rail. What you could do is increasing the voltage, perhaps to something like 50V and increase the value of R8 to get more gain. You might also need to do some adjustments to the other values to make them work well with the higher rail.

It would be cool to convert it to +/- 25V rails and perhaps get rid of some of the coupling caps.

[Zen Mod]

Originally posted by lykkedk
...............

Jesper

have you headphone output on your CD player?

try to feed Babelfish from that output,just for test.....then tell us what you hear.

25~30W is plenty of oooompfhghs ,in A class , anyway.....

steen- one of first NS10Klone variants (with+/- supply) can be better,regarding swing

and-also.little fiddling with feedback resistors can bring little more .......

[steenoe]

The concept of daisy-chaining is desribed here: http://sound.westhost.com/project37.htm Just above the picture of the prototype.
We tried to make a splitrail version sometime ago. Russ White's schematic is attached. I have one playing at home and will try to hook it up with the F4.

Steen

[Babowana]

Originally posted by steenoe


The X-BosoZ hasn't got a lot of gain. Actually it has problems driving several amps to full output, or clipping!

I think that the increasing gain is possible. It is also possible with BOSOZ. The distortion numbers are going up, though. BTW, which amp has low distortion with high gain . . .

When the music is reproduced correctly, I'm often tempted to increase volume because I feel as if the sound pressure level were low. In opposite way, the lousy music gives me feeling of high sound pressure.

[apassgear]

Originally posted by steenoe
NS10 schematic attached. Might be the answer, until something else shows up.
Other ideas and suggestions are welcomed too

Steen

One way of getting higher output of the NS10 would be to decrease the FB replacing R10 with a higher value say 10 or 15K and see what happens.

[carpenter]

off topic: sorry!

Hey doggy, what's your impression of the fostex fe108ez--and what kind of horn?

I'm thinking of trying that combo with my ZV7-T.

[doggy]

Excuse the momentary diversion of ths F4 amplifier thread.

Of all the fostex drivers I have, I like the midrange clarity and less of that piercing sound of other fostex , and it does a decent full range. I built 2 single horns previous; this HM Saxaphon inspired design is my own; I call it HM Alto. It uses the fe108ez+mcm 8"which was the driver for the "Tuba " sub. Each enclosure has a front horn and a rear 8" sub horn.These drivers are hooked up out of phase with no X-over, presenting a 3 ohm load which works fine with the A30. A little complicated to build but I am happy with them. If interested, I have some photos and plan at webshots. Email me for any questions re the fe108ez.

[doggy]

another pic.

And the A30; how would it compare to the F4?

[audiotux]

hm = Horst Möller

www.hm-moreart.de


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