Originally Posted by mrarroyo
The Supermini IV should not have any issues driving the HD600. Please check:
- Batteries are in good condition
- Open the amp and see if you have AD8397 on both the L/R and the 3/4 locations. If not, what do you have?
- Have you tried changing the gain to HI?
It's not that the SuperMini can't drive them fairly loud,and my idea of satisfying levels are probably higher than most people.
I did check batteries and they are still testing high on my RS meter which tests under load. Batteries are Energizer lithium.
I did change the gain to high for my previous tests and my recent trial earlier today.
I played a track from The Flower Kings- "Church Of Your Heart"(line out from iPod). Maximum loudness was 78 ~ 80 dB. max before obvious clipping and general bad sound.
I'm used to being able to crank my 650 with my tube amp also using my Aphex 204 which I use to add bass. With the 204 they become quite bassy which I'm used to(not Darth Beyer standards though).
I don't always listen at 80 dB. constantly but do exceed that at times.
I disabled bass boost on the SuperMini, in high gain, impedance off, crossfeed off. With these options, the 650 sounded thin. With bass boost on in an attempt to give weight to the 650 is where the power seemed to get really sucked out.
For listening around 75 dB. or below the SuperMini does fine with the 650, they just don't sound nearly as dynamic as my Woo 3. I know it's not fair to compare these 2 amps but my bottom line is that a small amp powered by 2 AAA batteries can't take the 650 very far...atleast not to my expectations. I see the SuperMini IV as an amp for IEMs only.
I'm assuming that my Xin amp has been properly assembled since I haven't changed anything except the jumpers. I do plan to send it back to Xin for the latest upgrades and to change op-amps, possibly requesting your recommendations that you've posted for me.
Again, here is my SuperMini IV: