Amp Camp Pre+Headphone Amp - ACP+

[chede]

I tested the ACP+ as a speaker amp on my Jericho Horns (Fostex 208 Sigma). The sound was very nice in general, but bass was quite soft ...


Regards, Claas

 

[Zen Mod]

put buffer after buffer



now seriously - just make augmented ACP, and call it - Aleph J

 

[peppennino]

put buffer after buffer

So... It could drive F4?

 

[Cinco]

I tested the ACP+ as a speaker amp on my Jericho Horns (Fostex 208 Sigma). The sound was very nice in general, but bass was quite soft ...


Regards, Claas

Yeah, most of the power goes into the bass, so 1/2 watt is kinda light.
What ZM said... Buffer after supports the bass much better. That's what I'm doing these days for light music setup.

ACP -> MoFo -> MarkAudio CHN70 (70mm dia fullranger)

 

[andynor]

put buffer after buffer

So... It could drive F4?

Not to full output without circuit/PSU changes. But according to Amandarae (I think) it is an excellent combo with horns.

 

[triode_al]

Yeah, most of the power goes into the bass, so 1/2 watt is kinda light.
What ZM said... Buffer after supports the bass much better. That's what I'm doing these days for light music setup.

ACP -> MoFo -> MarkAudio CHN70 (70mm dia fullranger)

And with two buffers you will have . . a bi-amp for the speaker.

 

[Zen Mod]

I've told ya all numerous times - go and build M2

if you need more amps, just build more M2s

 

[chede]

Well, my buffer is an F4 ...

 

[andynor]

Chokys love of the M2 circuit is neverending. If it had fingers he would marry it

So maybe one should build one… so many to build, so little time. Good life ain’t over yet

 

[Mark Johnson]

I've told ya all numerous times - go and build M2

if you need more amps, just build more M2s

Be sure to investigate Prasi's freely downloadable Gerbers for an M2 clone. It uses a two sided surface mount PCB and is incredibly small. It also incorporates a new part on the PCB which was not included in the original First Watt M2: a magnetic shield (metal box) soldered to the PCB, completely enclosing the Edcor transformer. Here is the box

To purchase the box: LINK

And here is the Forum thread which includes the freely downloadable Gerber files (in post #36)

Nelson Pass M2

 

[andynor]

Nice. Thanks, Mark!

 

[peppennino]

I was searching for a steel box like that for my MiniPearl build: thanks!

 

[adydula]

I wnat to thanks Ben Mah for helping me with setting up my ACP + for my HD 650 300 ohm headphones. It only took 2 days to get the resistors needed from Mouser....15 min to remove and install / add...

The HD 650's are a very nice pairing with this amp now..superlative!

Alex

 

[Ben Mah]

You're welcome. Enjoy the music.

 

[RafaPolit]

I never made the change, I kept it for 32 ohms and use the HD600 and love it. I have yet to do an A/B with the Whammy, but on absolute terms, it works well also without the mods, although it may have more distortion.

Rafa.

 

[adydula]

Added the simple SMPS filter...

 

[adydula]

Father, Son and the ACP+
lol

 

[Zen Mod]

I'm biased

most like most upper one

 

[adydula]

Ha!

I wonder why!!

lol

:>)

Wayne, Bill and you!

 

[adydula]

I never made the change, I kept it for 32 ohms and use the HD600 and love it. I have yet to do an A/B with the Whammy, but on absolute terms, it works well also without the mods, although it may have more distortion.

Rafa.

Rafa,

I setup the ACP+ for 300 ohms and like I said its really a stellar match for me. That said my Final Audio D8000 Pros are 60 ohms and they work wonderfully with the setup as well..actually better than some amps that are designed to work with a wider range of impedances...

This little amp is indeed very special.

Alex