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1

Monday, July 30th 2012, 4:16pm

Can someone explain the logic behind not including 96k?

I have ordered a Kemper and am waiting patiently for it to be approved in Canada. When looking at the device the only thing that weirded me out was its consumer grade input and output with spdif. What is the reason for this? 96k is getting very very common for recording, making the digital not compatible with a lot of peoples sessions in their DAWs. My computer is 5 years old so I still with 48k usually but come Jan I will have a new one and will want to use 96k. This will mean I will have to use the analog ins and outs of the Kemper. This is acceptable but I would much prefer to use the digital.

Anyways. I'm just curious as to why Kemper went with spdif. The digital would really only be used in Studio situations and most of these people have AES (not spdif) and like to record at 96k.

So Kemper.... Why?

EDIT: one more question. Why can it only be master and not slave in digital? Very weird.

This post has been edited 1 times, last edit by "thedommer" (Jul 30th 2012, 4:43pm)


2

Monday, July 30th 2012, 4:58pm

Do a search on the forum. I'm pretty sure I've read a thread with Mr. Kemper himself discussing this.

3

Monday, July 30th 2012, 6:32pm

I did search. there are a billion threads on digital so I am having trouble finding a reply from Mr. Kemper.

Dom

4

Monday, July 30th 2012, 8:08pm

He signs his post "CK" if that helps. :thumbsup:

5

Monday, July 30th 2012, 9:37pm

I did search. there are a billion threads on digital so I am having trouble finding a reply from Mr. Kemper.

Dom
http://kemper-amps.com/forum/index.php?f…0459&highlight=

This is a link of the posts from Mr. Kemper, hopefully you'll find the replies you're looking for this way.

Sigh.. links still not working.
Ok, go to Members, find CKemper, and you can find all of his posts there.

6

Monday, July 30th 2012, 10:24pm

96 kHz would require sampling rate converters in the KPA, which is pretty complicated to realize and does not improve the sound quality by a single bit.
I sometimes wonder why sampling rate converters are not provided by audio interfaces.

Elantric

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Posts: 140

Location: San Luis Obispo, CA USA

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7

Monday, July 30th 2012, 10:37pm

Quoted

I sometimes wonder why sampling rate converters are not provided by audio interfaces.


To save cost - but i agree - today the AKM AK4122 can be easily incorporated into most designs rather inexpensively
http://www.akm.com/prodfolder-src.asp?p=AK4122

8

Tuesday, July 31st 2012, 6:57am

Ah I see. How would it not improve quality? I'm more thinking about the re-amping. Going from sound card to Kemper and back again without using digital is 4 stages of conversion. Seems like there would be a bit of degradation especially with the average users sound card. If my session is at 96k I would have no choice but to use analog for the re-amping.

Also the 96k would only be Digital to Digital conversion. Is that not much cheaper than A/D?

Right now all the digital in/outs in the the box are 24/44.1. So by sample rate converter you mean something that takes that 24/44.1 and converts it to 96k. I could see how this would not better the quality since it is taking a lower rate and "faking" the higher rate. I presume this is what you mean?

So the only solution would be to have the entire box at 96k? And that is to expensive? And would not be better sound quality at all?

Also curious why the Kemper can only be a master and not slave?

Thanks for replying to my uneducated questions. :) Much appreciated! I am waiting with great anticipation for the CSA approval so I can finally get mine here in Canada.
Dominic

This post has been edited 1 times, last edit by "thedommer" (Jul 31st 2012, 7:14am)


tylerhb

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9

Tuesday, July 31st 2012, 8:19am

I'm more thinking about the re-amping. Going from sound card to Kemper and back again without using digital is 4 stages of conversion.
That´s why reamping over SPDIF makes so much sense and works perfectly.

I agree that we should have a SPDIF Slave option soon, which will make life a little easier.

But neither do i need 96 Khz or AES. I think that not even 5% of all KPA users would use those.

mba

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Location: Frankreich

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10

Tuesday, July 31st 2012, 8:27am

It does internal oversampling, that's why i can't understand why it's so hard to provide higher sample rates.
Any explanation? (i had the same question for my Axe Ultra)