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hotaudio40 's amps - Page 23

post #331 of 771
Hey, HotAudio. Would any of your Dac/amps be up to driving a Sennheiser HD600 or HD650? I have a Senn HD555 right now and I am looking to upgrade. I am quite sure that my sony STR-DE185 would not be able to handle it though. I am also going from my crap soundcard's DAC to my Sony STR-DE185 as an amp. The SQ must be suffering there.

HD600

Frequency response: 12 to 39,000 Hz
Frequency characteristic: Diffuse field, equalized
Driver size: 1.5 inches in diameter
Nominal impedance: 300 ohms
Characteristic sound pressure level at 1 kHz: 97 dB
Load rating: 0.2 milliwatts
THD: Less than 0.1 percent

HD650


Nominal impedance: 300 ohms
Sensitivity: 103 dB (1V RMS at 1 kHz)
Total harmonic distortion: Less than 0.05 percent
Long-term maximum input power: 500 mw
Frequency response: 16 to 30,000 Hz (-3 dB), 10 to 39,500 Hz (-10 dB)
Frequency curve: Diffuse-field loudness equalization
post #332 of 771
Well both the MARK IV and the SUPREME DAC/AMPS can deliver about 1.4 Volts RMS around 4 Volts peak to peak.

So from that I'd say those two models can, and I'm pretty sure a few of my customers are using the HD600s and the HD650s and they seem happy....
post #333 of 771
Well thank you. You may be recieving my business soon then.
post #334 of 771
Hey HotAudio, I have a pair of Audio Technica ATH-911's (AT's flagship model of the late 80's and then some) which DAC do you recommend?

Thanks!
post #335 of 771
Well I couldn't find any specs on the Audio Technica ATH-911's but if they are between 30 and 300 ohms then I'd recommend the MARK IV or the SUPREME models.

They seem to be able to drive just about any headphones in that impedance range.
post #336 of 771
well i bought the DAC Straight off of ebay (thanks for accepting my offer heh ).

This is not the one that requires your amp to be ac-coupled is it? I have no idea if my amp is :-/. I probably should have asked this before buying haha.
post #337 of 771
WOW! I won the DAC Destroyer on eBay!

Can't wait, I'm excited to post impressions. Thanks hotaudio!

EDIT: WOW! I just paid, and he shipped it out today! I am amazed at the service. Thank you.

nG
post #338 of 771
Quote:
Originally Posted by sgupt View Post
well i bought the DAC Straight off of ebay (thanks for accepting my offer heh ).

This is not the one that requires your amp to be ac-coupled is it? I have no idea if my amp is :-/. I probably should have asked this before buying haha.
You're lucky
The "DAC STRAIGHT" is AC coupled, so you'll be fine

Always read before you buy though, I make LOTS of different models, so read what your buying carefully!!!

post #339 of 771
Quote:
Originally Posted by hotaudio40 View Post
You're lucky
The "DAC STRAIGHT" is AC coupled, so you'll be fine

Always read before you buy though, I make LOTS of different models, so read what your buying carefully!!!

Yeah, I thought that DAC straight dual mode was the one that required the amp to be ac-coupled, I just wanted to double check heh.
post #340 of 771
Well actually the DUAL MODE DAC has both options, AC or DC mode, thus the "DUAL MODE"

But I myself know my amps are AC coupled, so I tried it out and it worked fine, as for ALL the other amplifiers out there, not sure if they have AC coupled inputs or not.

Most probably do, but I'm sure a few do not.

Thanks!!!
post #341 of 771
Quote:
Originally Posted by Nicodezo View Post
The one that seemed most interesting to me, despite limited info on the website and no mention of it in this thread, was the Mark VII Bit-Perfect USB DAC (HotAudio site or eBay). Looks to me like a Mark IV with a volume knob, which would suit me just fine.
Sorry for the self-quote, but I'm still curious to find out what this particular new model is based on and where it fits into the lineup. HotAudio40, any info to pass onto your fans here?



(and yes, mine is on its way... I couldn't resist!)
post #342 of 771
Quote:
Originally Posted by hotaudio40 View Post

I could see making a DAC with spdif input, but then it can't run off a PC.

I have a few chips with spdif inputs as well and someday I'll hook one up see how it sounds...

hotaudio40
Have you tried this yet? How did it sound? I'm very interested in a barebones SPDIF coax input dac that sounds good and is cheap. Any estimate on cost? Geo
post #343 of 771
Well Nicodezo...

You were right in your guess that the "MARK VII BIT PERFECT" is a MARK IV with a volume...

It is slightly enhanced,... well all my products now are enhanced to bring out a more 'warm' sound while still maintaining a very accurate and real sound.

I had been thinking about these "bit perfect" articles I've been reading and realized that isn't so hard to do.
But you can't do it in the digital realm. You must do it in the analogue realm. Thus the volume control.

Having the volume allows you to keep the digital volume on the PC turned up to 100% therefore there is no processing being done to the digital audio stream.

Then you simply control the volume in the more traditional way of using a potentiometer.

Simple yes, but the ONLY way to get TRUE pure 100% untouched digital information from the PC to your speakers or headphones

When you get it you'll have to let us know what you think about it...

post #344 of 771
Quote:
Originally Posted by gsawdy View Post
Have you tried this yet? How did it sound? I'm very interested in a barebones SPDIF coax input dac that sounds good and is cheap. Any estimate on cost? Geo
No, I haven't got around to doing that yet....
But I do have some PCM1796 coming...
I just need to get a few more parts and then I can make a SPDIF input DAC...

Not sure when I'll have time though...

But when I do have time, that is my next project...

It won't be "barebones" per sea, but it will be interesting...

I also need a good 24 bit 192 KHZ source...
post #345 of 771
Quote:
Originally Posted by hotaudio40 View Post
When you get it you'll have to let us know what you think about it...
Thanks for the info, exactly what I was hoping to hear! The qualities of a Mark IV, the possibility of bit-perfect transmission, plus the simple notion of a physical volume button I can adjust with my eyes closed.

I'll post my observations as soon as I receive it and have the chance for a good listening, bearing in mind this will be my first proper DAC...
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