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Amp For Mids Only

174.73.2.103

Posted on January 1, 2021 at 09:11:09
jcmusic
Audiophile

Posts: 1386
Location: New Orleans, La.
Joined: June 13, 2006
If you were looking to build a stereo flea powered (.75-2wpc) amp for use in a tri amped setup which amp, tube, and or circuit would it be?
Now this amp will be connected to two 16 ohm drivers that are rated at 118db/1watt/1meter...

 

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I'm using the 'Bottlehead' S.E.X. amp for bi-amping my horns..., posted on January 1, 2021 at 09:47:11
Ivan303
Audiophile

Posts: 41719
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
2 watts per channel, single ended indirectly heated 6FJ7 based amp of good design and quiet as a mouse. Is a kit but not THAT hard to build.

Recommend the $50 C4S upgrade but that's about all that's required.





 

RE: Amp For Mids Only, posted on January 1, 2021 at 14:37:28
Cut-Throat
Audiophile

Posts: 14925
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
I'd go for a 45 SET amp. With that said, I favor Bi-Amping and would let that flea power amp control the Mids and the Highs as I don't see the advantage of another amp and crossover for the Tweeters.

I use a Welborne Star Chief pair of Monoblocks for this setup. No longer available, but this was based on the DRD45 design.






 

RE: Amp For Mids Only, posted on January 1, 2021 at 15:56:23
Cut-Throat
Audiophile

Posts: 14925
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
BTW - I get to New Orleans a lot .... I Fly Fish there... What part of New Orleans are you at? I stay with my friend at Bay St. Louis MS....






 

RE: Amp For Mids Only, posted on January 1, 2021 at 16:57:26
jcmusic
Audiophile

Posts: 1386
Location: New Orleans, La.
Joined: June 13, 2006
I am about an hour away in Gretna just across the river from New Orleans.

 

RE: I'm using the 'Bottlehead' S.E.X. amp for bi-amping my horns..., posted on January 2, 2021 at 06:11:51
jcmusic
Audiophile

Posts: 1386
Location: New Orleans, La.
Joined: June 13, 2006
Thanks this is a possibility....

 

While certainly not available..., posted on January 2, 2021 at 06:20:54
Ivan303
Audiophile

Posts: 41719
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
Most of the iron and the design came from Jack Eliano at Electra Print Audio in Las Vegas.

Haven't talked to Jack in over a year but I bet he has everything one would need, in the way of iron and plans, to build it



 

RE: Amp For Mids Only, posted on January 3, 2021 at 03:58:12
91derlust
Audiophile

Posts: 963
Joined: December 25, 2014
All-DHT with low noise DC on the filaments, low ripple B+, and maybe transformer input. A single stage amp using EML 20B (or maybe even the 20A) tubes would be tempting in this role: quiet, very low distortion and the implementation compromises for active lower mids and above are minor.

"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein

 

RE: Amp For Mids Only, posted on January 3, 2021 at 06:29:42
rogerh113
Audiophile

Posts: 324
Location: San Francisco South Bay
Joined: October 20, 2014
Curious as to the impact of all of the complication on the final sound. Since the speakers are likely not a point source (coaxial / full range), and the drive is coming from multiple amps, it would seem very difficult to get all of that properly 'lined up' to sound good. I do realize that everyone's ears and objectives are different.

 

'lined up'..., posted on January 3, 2021 at 15:10:59
Ivan303
Audiophile

Posts: 41719
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
in what way?

180 phase difference seems the only risk, from two differing SET amps.

Levels, but that's a one time thing easily set with a signal generator (test CD) and a mic.

Otherwise?

At a given frequency, at or near the x-over point, I would guess there would be far more difference in the sound of two drivers in the same speaker system than between any two SET amps one might choose to bi-amp (or tri-amp) with.







 

RE: 'lined up'..., posted on January 3, 2021 at 15:27:10
rogerh113
Audiophile

Posts: 324
Location: San Francisco South Bay
Joined: October 20, 2014
I was thinking of things like differing signal delay through the different 3 amps, multiple source cables, multiple speaker cables. Need a 3 way crossover, with the associated complications. Then the speaker coherence - 3 physically distant speakers per side perhaps needing to achieve point source equivalent.

Maybe none of these things stack up, or are relevant. Perhaps the performance increase is worth the complexity. That is why I am curious. A fair amount of work and complexity compared to a single stereo set amp, single source and speaker cables, and a single / coax speaker.

 

Got it...., posted on January 3, 2021 at 17:47:43
Ivan303
Audiophile

Posts: 41719
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001

If I had these, maybe I wouldn't be bi-amping them.





 

RE: Got it...., posted on January 3, 2021 at 18:59:12
rogerh113
Audiophile

Posts: 324
Location: San Francisco South Bay
Joined: October 20, 2014
Sort of what I was thinking, although the high priced spread....

Impressive speakers, and large volume cabs with Altec 604s also do very well. Amp looks nice, but does not look SET ?

 

Speakers belong to Jeff Day..., posted on January 3, 2021 at 20:10:16
Ivan303
Audiophile

Posts: 41719
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
Not sure what he uses to drive them.



 

Found Thanks Guys, posted on January 5, 2021 at 04:43:44
jcmusic
Audiophile

Posts: 1386
Location: New Orleans, La.
Joined: June 13, 2006
I found one and am in the process of having setup for my drivers....

 

RE: This ^^^, posted on January 5, 2021 at 06:39:23
deafbykhorns
Audiophile

Posts: 976
Location: Florida
Joined: October 17, 2003
.

 

RE: While certainly not available... Oh yes Jack ..., posted on January 12, 2021 at 06:55:12
drummerwill
Audiophile

Posts: 945
Location: St Louis Mo.
Joined: January 7, 2003

Jack Eliano is one of my favorite winders-designers and good wit ..!

Willie

 

RE: 'lined up'..., posted on January 14, 2021 at 10:17:40
lokie
Audiophile

Posts: 1718
Location: Georgia, USA
Joined: January 28, 2003
I'm thinking the biggest problem is with volume and the different efficiencies of the amps themselves. As you turn up or down the volume all your amps will not stay in sync unless their specs are exactly the same.

The other "tell" as to a reason not to do this, is because nobody that really knows what they are doing does this(like the old super smart Western Electric and Altec engineers). Only weekend warrior audiophile types do this.

But sub 80Hz is probably OK.

 

RE: 'lined up'..., posted on January 14, 2021 at 10:32:24
rogerh113
Audiophile

Posts: 324
Location: San Francisco South Bay
Joined: October 20, 2014
I use a transformer volume control, a Bent Audio NOH. Several options from various vendors, but the transformer quality is a critical factor.

One of the components that is real game changer when I switched to it. Again, a simplification in the signal path, with no amplification, no resistive loss/shunting, and effective 'load matching'.

I can't imagine returning to an active preamp, unless I needed the amplification (which I don't).

 

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