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post #342 of 498
Quote:
Originally Posted by Draygonn View Post

452

About time smile.gif

How was the building process? Did you have prior experience?
post #343 of 498
Quote:
Originally Posted by pangolinman View Post

About time smile.gif
How was the building process? Did you have prior experience?

Haha, it has taken forever. I kept breaking/losing parts and had to get replacements. I hadn't soldered anything since I was a kid. The build process is straightforward and laid out step by step. 90% is trimming wires and soldering. Took maybe 8-9 hours total. I'll do the speedball upgrade next month.
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post #344 of 498
Actually, this was built a couple months ago, but...here's my Objective2 (O2) headphone amplifier. It's a pretty easy build as there's no wires to route. It's just place and solder. At one point I had issues, probably resulting from carelessly letting desoldering braid filled up with solder shorting out some of the power supply capacitors (holding like 18V) while I was touching up a few solder joints. It works fine now though.

Cell phone pics without the best lighting, so quality is not so great, but you can see what's going on.

579

450


For the sharp-eyed, a couple notes: (1) the four capacitors on the left are part of the power supply and are supposed to be the same, but I had spares and used two different types but with the same specs, (2) yes I mounted the board upside down in the enclosure and am not using a front panel, (3) R17 and R21 are indeed left blank intentionally to have 1x (no) gain on the low gain setting. High gain I set to 5.1x. Uh, also, (4) my soldering and parts placement sucks. biggrin.gif

Ports from left to right are AC power input, on/off switch, headphone stereo output (3.5mm), (LED), volume knob (potentiometer), gain switch, stereo input (3.5mm), for reference.
Edited by mikeaj - 12/21/11 at 11:24pm
post #345 of 498
Nice! I'm buying one of those this month! Cant wait.

Does it sound exactly like everyone is saying?
   
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post #346 of 498
Quote:
Originally Posted by Cotton View Post

Nice! I'm buying one of those this month! Cant wait.
Does it sound exactly like everyone is saying?

It sounds detailed and clean enough to me, but I doubt I'd be able to tell the difference if it were slightly off. The comprehensive tests and measurements using high-end pro audio benchmark gear, speak for themselves.

Certainly it has enough power for my headphones (AKG K601 is my main and pretty quiet at around 100 dB SPL / 1 V rms input), and I don't hear any noise from it on sensitive balanced armature IEMs (Klipsch Custom 2, not a great model but really sensitive at over 130 dB SPL / 1 V rms input). I think you might be able to pick out noise in an anechoic chamber with IEMs that sensitive, or otherwise a really quiet listening environment, but that's it.

I wouldn't expect audible improvements over the Essence STX output with any of your headphones though. The STX generally does very well, though definitely less well when next to all the noisy fast-switching power hogs in your box (CPUs and GPUs and the VRMs of course). In a cleaner system, the STX's only potential issue is really the 10 ohms output impedance, which can cause undesirable interactions with some headphones, particularly those with lower impedance and highly varying impedance over frequency. DT 770 Pro, ATH-M50, Q701, XB500 should be slightly affected by that, but not by much at all.

That's just a (somewhat) educated guess though. Maybe I'm wrong.
Edited by mikeaj - 12/22/11 at 2:09pm
post #347 of 498
YGPM.
   
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(3) ASUS PB236Q Roccat Isku FX Antec HCP 1200 800D 
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post #348 of 498
Quote:
Originally Posted by mikeaj View Post

here's my Objective2 (O2) headphone amplifier.

Nice. ChineseKiwi and I are waiting to receive our O2s from a group buy.
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post #349 of 498
I'm quite jealous of everyones O2's. I'm holding out for the desktop ODA + ODAC though. I'm probably going to DIY it and I'll be sure to post some pictures when I do. In the mean time, keep the O2 pictures/impression coming!
    
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post #350 of 498
364

470

434

AMB Labs M^3 to complement my tube amp. Powers my D7000s beautifully with the Bias cranked up.
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