AudioNervosa

Systemic Development => Digital Audio Devices => Topic started by: jimbones on January 16, 2013, 05:19:47 AM

Title: Something fishy with DAC
Post by: jimbones on January 16, 2013, 05:19:47 AM
Something is fishy with DAC
i learned something interesting about DAC's while building and testing DIY speakers.

I was measuring fr response of my speakers and was wracking my brains out because they were topping out at 13Khz. I called the manufacturer of the test equipment and they told me to bypass the DAC because expensive DAC's purposely roll off the top octave. So i did what he said and Voilia, my speakers were relatively flat up to 19khz!

I contacted the DAC manufacturere and they said it was impossible, it is my measuring technique or equipment. I don't think so. The cdp goes right up to 20khz.

Something is fishy.....am i missing something here?
Title: Re: Something fishy with DAC
Post by: richidoo on January 16, 2013, 06:34:59 AM
Flat is so pro-audio.

We pay extra for the hifi "voicing."       :lmc:
Title: Re: Something fishy with DAC
Post by: jimbones on January 16, 2013, 09:57:24 AM
Quote from: richidoo on January 16, 2013, 06:34:59 AM
Flat is so pro-audio.

We pay extra for the hifi "voicing."       :lmc:

:(
Title: Re: Something fishy with DAC
Post by: Face on January 16, 2013, 11:58:59 AM
I would love to know which DAC this is...
Title: Re: Something fishy with DAC
Post by: sleepyguy24 on January 16, 2013, 12:09:09 PM
Maybe a Burson 160D?
Title: Re: Something fishy with DAC
Post by: jimbones on January 16, 2013, 02:44:41 PM
Burson 160D .. as the man said.
Title: Re: Re: Re: Something fishy with DAC
Post by: mgalusha on January 18, 2013, 07:34:24 AM
Quote from: jimbones on January 16, 2013, 02:44:41 PM
Burson 160D .. as the man said.

I measured one of the Burson dac/headphone amps for a friend, IIRC the frequency response did vary with the position of the level control, not good practice IMO. 

Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
Title: Re: Something fishy with DAC
Post by: woofersus on January 18, 2013, 07:52:40 AM
I can't imagine this is common practice among all high end DAC's.  If Burson products do it (on purpose or otherwise) it certainly isn't something I would choose to buy.
Title: Re: Re: Re: Something fishy with DAC
Post by: mgalusha on January 18, 2013, 09:03:11 AM
Quote from: woofersus on January 18, 2013, 07:52:40 AM
I can't imagine this is common practice among all high end DAC's.  If Burson products do it (on purpose or otherwise) it certainly isn't something I would choose to buy.

Agreed, I doubt it's common and I was surprised at the result. IIRC there was a fixed output which was OK but it's been a while and time makes the memory a little fuzzy. :)

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