I am looking for data on M-Audio Audiophile frequency range at 96/16 and 96/24. The data which I was able to find on the internet were up to 20 kHz, whereas I am interested also in the 20-40 kHz range. Data on the output (DAC) would be most helpful, but results of a RMAA loopback test from a user are also welcome. I tried to get it from M-Audio, but got no results so far. I will appreciate your help.
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Richard Crowley 1 March 2006 00:35:17 [ permanent link ]
"Pawel Kusmierek" wrote ...>I am looking for data on M-Audio Audiophile frequency range at 96/16> and 96/24. The data which I was able to find on the internet were up> to 20 kHz, whereas I am interested also in the 20-40 kHz range. Data> on the output (DAC) would be most helpful, but results of a RMAA> loopback test from a user are also welcome.> I tried to get it from M-Audio, but got no results so far.> I will appreciate your help.
If you are interested in frequencies >20KHz, you might be able to find audio devices which happen to have extended HF response, but I wouldn't want to depend on them. There are likely laboratory- quality A/D and D/A converter boards which are specified for those frequencies and even higher. But anything >20KHz is not generally considered to to be mainstream "audio".
Are you just looking for a one-off device which happens to work up to 40KHz?
"Pawel Kusmierek" <bwv1004@gazeta.pl> wrote in message news:1141162710.820749.109120@v46g2000cwv.googlegroups.com> Leo Andrews wrote:>> The internet is your friend ;)>>
Leo: I've been there. They give the frequency range up to> 22 kHz. I need to know how it works up to around 40 kHz.
I've tested it and found that it was either flat or 3 dB down @40 KHz. I just can't remember which. I think it may have been either, depending on which change level drivers were being used at the time.
Arny Krueger wrote:> "Pawel Kusmierek" <bwv1004@gazeta.pl> wrote in message> news:1141162710.820749.109120@v46g2000cwv.googlegroups.com>
Leo Andrews wrote:>>
The internet is your friend ;)>>>
Leo: I've been there. They give the frequency range up to>>22 kHz. I need to know how it works up to around 40 kHz.>
I've tested it and found that it was either flat or 3 dB down @40 KHz. I > just can't remember which. I think it may have been either, depending on > which change level drivers were being used at the time. >
How have you tested it, out of interest?
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"Leo Andrews" <leo@invalid.syntax> wrote in message news:1141169098_9823@sp6iad.superfeed.net> Arny Krueger wrote:>> "Pawel Kusmierek" <bwv1004@gazeta.pl> wrote in message>> news:1141162710.820749.109120@v46g2000cwv.googlegroups.com>>
Leo Andrews wrote:>>>
The internet is your friend ;)>>>>
Leo: I've been there. They give the frequency range up>>> to 22 kHz. I need to know how it works up to around 40>>> kHz.>>
I've tested it and found that it was either flat or 3 dB>> down @40 KHz. I just can't remember which. I think it>> may have been either, depending on which change level>> drivers were being used at the time.> How have you tested it, out of interest?
Good question. It was several years ago.
Probably did some of the tests I generally do at my web site, of which this is an example:
"Richard Crowley" <richard.7.crowley@intel.com> wrote in message news:du2s7a$1de$1@news01.intel.com> "Pawel Kusmierek" wrote...>> Arny Krueger wrote:>>
I've tested it and found that it was either flat or 3>>> dB down @40 KHz.
Thanks, even with a 3-dB drop should be good enough for>> me.
But is that just a fortunate artifact, or is it designed> that way?
As a rule any card that samples at 96 KHz (aside from some garbage from Creative Labs) has a reasonably flat bandpass up to about 42 KHz.
There are two schools of thought about what shaping the bandpass *should* have:
One school of thought says hold precisely flat response up to 95% of Nyquist, followed by a brick wall roll-off.
The other says hold precisely flat response up to 24 KHz, do a gentle roll-off to 42 KHz or so, and then do the brick wall thing.
Lack of published specifications to that effect make one wonder.
AFAIK all of the Delta-series PCI cards have a common architecture. A Via Envy-24 PCI interface/DSP chip is the centerpiece, and various numbers of AKM ADC/DAC hold down the conversion tasks, with I/O buffers based on 5532s.
The AKM ADC/DAC chips used in the Delta series are programmable, and the frequency response is one of the parameters that can be programmed.
At one point the Delta series drivers were screwed up and some DSP paramater was mis-set in such a way that frequencies above 24 KHz were mirrored, in 24/96 mode. IOW aa signal at 47 KHz was turned into 1 KHz, 33 KHz (48-15) was turned into 15 KHz, etc.
"Pawel Kusmierek" <bwv1004@gazeta.pl> wrote in message news:1141169225.815881.281820@e56g2000cwe.googlegroups.com...>
Arny Krueger wrote:>
I've tested it and found that it was either flat or 3 dB down @40 KHz.>
Thanks, even with a 3-dB drop should be good enough for me.>
OK, I'm gonna ask for everyone else that are wondering but are too polite to ask... What is your application? Please forgive my idle curiosity, but I've been wondering since I first read you post a few hours ago.
Pawel Kusmierek 2 March 2006 19:19:33 [ permanent link ]
Pawel Kusmierek wrote:> I am looking for data on M-Audio Audiophile frequency range at 96/16> and 96/24. [...]> I tried to get it from M-Audio, but got no results so far.
If anyone is interested: according to M-Audio Tech support the frequency range of Audiophile 2496 is limited to 22 kHz at 96 kHz sampling rate.
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