JDS Labs C5 portable amplifier appreciation + discussion thread (check 1st post for review) - Page 2

Quote:

Originally Posted by randomkid 

I have the AD8620, let's see if this takes it's place,I really enjoy the AD8620 sound

I have the AD8620 mounted on a browndog and I use it with my CMoyBB v2.03 18vR, hence why I got the OPA2227 C421 version, besides I like the warmth it gives to the C421 sound.

Quote:

Originally Posted by antberg 

Hi Gain,Bass Boost,Switch Off-On on the behind?

Gain is toggled by pushing the volume control. Bass boost uses the same toggle switch found on c421. Power switch is at the rear (no more hidden LEDs).

The C5 pictured here was an older prototype, missing its bass boost switch. This was quick check of endplate machining accuracy.

I am just thinking...what if it comes with Cameleon colour...it'd be super cool!  

Quote:

Originally Posted by jseaber 

Quote:

Originally Posted by antberg 

Hi Gain,Bass Boost,Switch Off-On on the behind?

 

Gain is toggled by pushing the volume control. Bass boost uses the same toggle switch found on c421. Power switch is at the rear (no more hidden LEDs).

 

The C5 pictured here was an older prototype, missing its bass boost switch. This was quick check of endplate machining accuracy.

Speaking of the volume control, how does that work? It doesn't look like the "dial" used in the c241. Is it the kind of "dial" where it goes to the center and then you move it left/right to decrease/increase the volume?

Similar to my super-old Creative Zen Nano Plus:

Quote:

Originally Posted by miceblue 

Speaking of the volume control, how does that work? It doesn't look like the "dial" used in the c241. Is it the kind of "dial" where it goes to the center and then you move it left/right to decrease/increase the volume?

Similar to my super-old Creative Zen Nano Plus:

 

Yes, the C5 volume control is an Alps lever like the kind you've described.

Pushing the lever left or right tells C5 to step the volume position by 1dB every 55ms, with zero-crossing detection. We revised the firmware until achieving a smooth and comfortable rate of volume adjustment. The entire range of volume from mute to max takes ~3.5 seconds, and single steps are still possible. Volume and gain positions are saved to the onboard ATmega168 flash.

Quote:

Originally Posted by jseaber 

Quote:

Originally Posted by miceblue 

Speaking of the volume control, how does that work? It doesn't look like the "dial" used in the c241. Is it the kind of "dial" where it goes to the center and then you move it left/right to decrease/increase the volume?

Similar to my super-old Creative Zen Nano Plus:

 

 

Yes, the C5 volume control is an Alps lever like the kind you've described.

 

Pushing the lever left or right tells C5 to step the volume position by 1dB every 55ms, with zero-crossing detection. We revised the firmware until achieving a smooth and comfortable rate of volume adjustment. The entire range of volume from mute to max takes ~3.5 seconds, and single steps are still possible. Volume and gain positions are saved to the onboard ATmega168 flash.

Sweet, sound great! I miss that kind of volume control. I don't know of any audiophile equipment that uses it. My only concern for it is mechanical failure and how long it'll last since it feels like a spring mechanism. I'm assuming it will last quite some time though.

Quote:

Originally Posted by miceblue 

Sweet, sound great! I miss that kind of volume control. I don't know of any audiophile equipment that uses it. My only concern for it is mechanical failure and how long it'll last since it feels like a spring mechanism. I'm assuming it will last quite some time though.

Operating life of the Alps lever is spec'ed at 100,000 cycles. Alps potentiometers are rated at only 10,000 cycles.

Quote:

Originally Posted by jseaber 

Quote:

Originally Posted by miceblue 

Sweet, sound great! I miss that kind of volume control. I don't know of any audiophile equipment that uses it. My only concern for it is mechanical failure and how long it'll last since it feels like a spring mechanism. I'm assuming it will last quite some time though.

 

Operating life of the Alps lever is spec'ed at 100,000 cycles. Alps potentiometers are rated at only 10,000 cycles.

All righty then, I'm in for the C5 already. :)

I've been looking for a clean-sounding portable amp recently since the O2 is too large to fit in most of the jackets I wear, hahaha. I was going to look in to the C241 more, but it looks like the C5 will be my next audio purchase.

As for colours, the all silver, or all black options sound good to me. It would be really neat to have an electric blue option though if resources allow for it.

Thank you John,we all having great expectations.

In on this. 

Quote:

Originally Posted by antberg 

Hi Gain,Bass Boost,Switch Off-On on the behind?

+1- where, oh where, is the bass boost???

Quote:

Originally Posted by Craigster75 

+1- where, oh where, is the bass boost???

See post #17. It's the empty hole in this older prototype...

It'll make sense when we post final pictures.

How does the C421 compare to say the O2? That is the only one I have actually heard of that is built by JDS Labs.

I'm guessing this is an upgrade so should sound better than the C421 if that is infact newer than the O2?