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Audio DB25... Where do you get it?

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Anonymous   09-07-2005 at 03:00:23 PM

Archived from groups: rec.audio.pro (More info?)

 

I need to find three short DB25 male to DB 25 male (the usual audio
multichannel connector) to connect three 8 channels preamps to a Mackie HDR.
I only can find digital ones (they work well too) but 6 feet long. Since I
have the pres and the HDR in one case it would be crazy to fit 18ft. of
cable in the back of the case.
Where do you buy this kind of things? Is there a place where I can have it
made?
F.

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Anonymous   09-07-2005 at 03:00:24 PM
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Archived from groups: rec.audio.pro (More info?)

 

Federico wrote:
> I need to find three short DB25 male to DB 25 male (the usual audio
> multichannel connector) to connect three 8 channels preamps to a Mackie HDR.

I have a Mackie HDR and a Mackie 800R preamp. I cheat and use a cheap
computer store double male DB25 cable. I got the fancy kind that has an
overall shield. I think it cost about $6. This isn't perfect, but it
works well enough for me, and for you to try.

The reason why it works is because the outputs of the preamp and the
inputs of the HDR are well enough balanced so that common mode hum and
noise is sufficiently low. If your preamp outputs are balanced, give it
a try. There are no "sound quality" issues other than susceptibility to
hum and other EMI noises. If it's not a problem, go cheap. If it's a
problem, you've only lost a few bucks, and if you have stores like I
have stores, you can probably even return the cable for a refund.

If you feel the need to use proberly shielded cables, Hosa makes audio
DB25-DB25 cables in 1.5, 3, 5, 10, and 15 foot lengths. It's the DBD
series.

Reply to Anonymous
Anonymous   09-07-2005 at 03:00:24 PM
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Archived from groups: rec.audio.pro (More info?)

 

"Federico" <plokmichael@tiscali.it> wrote in message
news:H_xTe.29170$4g5.2040932@news4.tin.it...
>I need to find three short DB25 male to DB 25 male (the usual audio
> multichannel connector) to connect three 8 channels preamps to a Mackie
> HDR.
> I only can find digital ones (they work well too) but 6 feet long. Since I
> have the pres and the HDR in one case it would be crazy to fit 18ft. of
> cable in the back of the case.
> Where do you buy this kind of things? Is there a place where I can have it
> made?
> F.


Try :

http://www.hotwiredcables.com/

or

http://www.redco.com/

or

www.gepco.com

--
John L Rice
Drummer@ImJohn.com

Reply to Anonymous
Anonymous   09-07-2005 at 04:03:58 PM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

Federico <plokmichael@tiscali.it> wrote:
>I need to find three short DB25 male to DB 25 male (the usual audio
>multichannel connector) to connect three 8 channels preamps to a Mackie HDR.
>I only can find digital ones (they work well too) but 6 feet long. Since I
>have the pres and the HDR in one case it would be crazy to fit 18ft. of
>cable in the back of the case.
>Where do you buy this kind of things? Is there a place where I can have it
>made?

I'd just make it. But your local pro audio place can probably just make one
up on the fly. You can try CEP snc. in Cardano al Campo. They always send
a delegation to the European AES show and seem like nice guys.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Reply to Anonymous
Anonymous   09-08-2005 at 02:52:06 AM
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Archived from groups: rec.audio.pro (More info?)

 

Federico wrote:

> I need to find three short DB25 male to DB 25 male (the usual audio
> multichannel connector) to connect three 8 channels preamps to a Mackie HDR.
> I only can find digital ones (they work well too) but 6 feet long. Since I
> have the pres and the HDR in one case it would be crazy to fit 18ft. of
> cable in the back of the case.
> Where do you buy this kind of things? Is there a place where I can have it
> made?

When I've designed in DB25s to make audio interconnects, we had one once that
linked an expander to a mixer for example, it's been designed to use so-called
'computer cables'. The ones with an overall screen. This is done because they're
nice and cheap.

The wire inside itself is just the same btw - just in case some audiophool told
you there was a difference between digital copper and analogue copper. You never
can be sure of what foolishness may be about these days. ;-)

Graham

Reply to Anonymous
Anonymous   09-22-2005 at 04:36:51 PM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote:

> When I've designed in DB25s to make audio interconnects, we had one once that
> linked an expander to a mixer for example, it's been designed to use so-called
> 'computer cables'. The ones with an overall screen. This is done because
> they're nice and cheap.
>
> The wire inside itself is just the same btw - just in case some
> audiophool told you there was a difference between digital copper and
> analogue copper. You never can be sure of what foolishness may be
> about these days. ;-)

When you're connecting equipment that somebody else designed, you're
generally obligated to use cables with a pin configuration that matches
the connectors on the gear. Eight balanced audio connections on 24 of
the 25 pins generally works best if there are shields around twisted
pairs and the shields are connected to the correct pins. If you were
to use a "computer cable" as Mike suggested, you wouldn't get
individual channel shielding which could work just fine, provided that
all 24 conductors are connected to the same pin at both ends, and the
overall shield isn't connected to one of the pins that should be
carrying audio.

ulysses

Reply to Anonymous
Anonymous   09-22-2005 at 08:22:37 PM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

Justin Ulysses Morse wrote:

> Eight balanced audio connections on 24 of
> the 25 pins generally works best if there are shields around twisted
> pairs and the shields are connected to the correct pins. If you were
> to use a "computer cable" as Mike suggested, you wouldn't get
> individual channel shielding which could work just fine, provided that
> all 24 conductors are connected to the same pin at both ends, and the
> overall shield isn't connected to one of the pins that should be
> carrying audio.

The thing that makes it work fine _in this application_ is that the
outputs are balanced and the inputs are differential, so there's good
common mode noise rejection. It would be better if the pairs were
twisted, and if they were shielded that would be another improvement.
My cheep rig works at home, where I've checked it out. Would I take it
out to a bar and rely on it to make a noise-free recording? Not likely.
Too many unknowns there. Noise from the "BEER" flashing neon sign might
just really be helped by shielded twisted pairs.

Maybe I need to get a BEER sign to add to my shop test equipment. Naw,
I think I'll just stick with the beer.

Reply to Anonymous
Anonymous   09-23-2005 at 05:56:33 AM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

Mike Rivers <mrivers@d-and-d.com> wrote:

> The thing that makes it work fine _in this application_ is that the
> outputs are balanced and the inputs are differential, so there's good
> common mode noise rejection.

Exactly. but if the cable you were using happened to have, say, pin 1
connected to the overall shield, well, that might not work so well in a
system where pin 1 is supposed to be connected to half of a twisted
pair. Then there are some computer cables without all the pins wired,
or with crossover pins, etc. So it's something that might work
sometimes, but not something to rely upon.

ulysses

Reply to Anonymous
Anonymous   09-23-2005 at 04:26:55 PM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

Justin Ulysses Morse wrote:

> Exactly. but if the cable you were using happened to have, say, pin 1
> connected to the overall shield, well, that might not work so well in a
> system where pin 1 is supposed to be connected to half of a twisted
> pair. Then there are some computer cables without all the pins wired,
> or with crossover pins, etc.

This is why a pin-to-pin cable is the one to use for this application.
If there's a shield, it's not connected to any of the pins on the
connector, it's connected to the connector shell, where it should be. I
just checked one that was on the loose and it has continuity between
the shells on both ends and no continuity between the shell and any of
the pins. So the only thing it doesn't have is twisted pairs for the
signal wires. It may have twisted pairs inside, but it's unlikely that
they're paired the same was as the TASCAM wiring.

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