Recent content by joeyjojo
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Sennheiser Momentum On-Ear Impressions
Just got a pair of these to see what they're like. First, straight out of my DAC (AMB gamma2) I was completely underwhelmed - "Bass? What bass?" I thought. See, I'm so used to high impedance headphones I forgot the gamma2 is totally unsuitable for ~25 ohm headphones like these. Out...- joeyjojo
- Post #572
- Forum: Portable Headphones, Earphones and In-Ear Monitors
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Post pics of your builds....
Off-topic, but I'm just reading an article that made me think of this. Especially this bit: http://www.innerfidelity.com/content/musings-headphone-amplifier-output-impedance This confirms my thoughts on the HD800, that it loves very-low output impedance amps to get the most...- joeyjojo
- Post #9,660
- Forum: DIY (Do-It-Yourself) Discussions
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Post pics of your builds....
Interesting. A damping factor of 1.09 is miserably low. I wonder if it sounds better to you because the flabbyness of the amp cancels out the precision of the headphones Nice craftsmanship all the same.- joeyjojo
- Post #9,652
- Forum: DIY (Do-It-Yourself) Discussions
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24/192 Music Downloads ...and why they make no sense
The article is a getting on a bit now but I thought it was worth sharing again. http://people.xiph.org/~xiphmont/demo/neil-young.html Convincing arguments for 44.1/16 being sufficient---even optimal---for playback.- joeyjojo
- Thread
- Replies: 0
- Forum: Computer Audio
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Roll Call: Who's building, built, or thinking of building a beta22?
AMB says one S22 per B22 board for speakers (regardless of 2 or 4 board). Deviate from that and you'll be deviating from the official word. Anyway, 50 W into 8 ohms would imply a current of over 6 A, which is going to dissipate far too much heat in the MOSFETs for the stock heatsinks. You...- joeyjojo
- Post #3,122
- Forum: DIY (Do-It-Yourself) Discussions
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Roll Call: Who's building, built, or thinking of building a beta22?
No, you'd only get half the VA rating that way. You need to wire the primaries in parallel with 115 V across each.- joeyjojo
- Post #3,077
- Forum: DIY (Do-It-Yourself) Discussions
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Roll Call: Who's building, built, or thinking of building a beta22?
DefQon is wrong in his assumption. Assuming you live somewhere with a 115 V mains supply you want to wire the primaries in parallel (BLU and VIO live, GRY and BRN neutral). Not 100% sure on the secondaries ...- joeyjojo
- Post #3,075
- Forum: DIY (Do-It-Yourself) Discussions
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Roll Call: Who's building, built, or thinking of building a beta22?
I've got used to that feeling - it's been about 20 months since I ordered the first parts- joeyjojo
- Post #3,067
- Forum: DIY (Do-It-Yourself) Discussions
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What is the best DIY DAC up to $500
Quote: You're right. Let's hope it's a typo.- joeyjojo
- Post #39
- Forum: DIY (Do-It-Yourself) Discussions
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What is the best DIY DAC up to $500
Come on wakibaki you know the answer to this. It's 128 dB monophonic, but this is a balanced DAC chip. The opamp afterwards acts as an unbalanced-balanced converter, giving you better SNR than just taking half the output alone.- joeyjojo
- Post #34
- Forum: DIY (Do-It-Yourself) Discussions
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Best Inexpensive DIY DAC ?
I just posted these links in the other DIY DAC thread. Check out the AMB designs. http://www.amb.org/audio/gamma2/ http://www.amb.org/audio/gamma1/- joeyjojo
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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What is the best DIY DAC up to $500
Can't believe nobody has suggested the AMB designs yet. AMB γ2 AMB γ1 I've got a gamma 2 and it's brilliant, technically and acoustically. I bought mine assembled for $200 and don't plan to ever replace it.- joeyjojo
- Post #30
- Forum: DIY (Do-It-Yourself) Discussions
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Cmoy components/gain
I'm not an expert, but you could compare your implementation to the σ25 (which uses the similar LM78xx parts). In that design, there is a smoothing cap before the rectifier (0.1 uF), a bulk cap (1000 uF electrolytic) and a bypass cap (0.1 uF) at the input of the reg, and another decoupling cap...- joeyjojo
- Post #50
- Forum: DIY (Do-It-Yourself) Discussions
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Roll Call: Who's building, built, or thinking of building a beta22?
Quote: I'm surprised nobody picked you up on this. Care to elaborate?- joeyjojo
- Post #3,048
- Forum: DIY (Do-It-Yourself) Discussions
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Cmoy components/gain
Quote: Totally fine. Either get a double pole double throw switch and switch both signal and grounds, or get a single pole double throw switch and only switch the signal line and tie the grounds together at the inputs (I'd probably do the latter). Of course you can have more...- joeyjojo
- Post #23
- Forum: DIY (Do-It-Yourself) Discussions