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dj gear related question
 

offline sadist from the dark side of the moon on 2006-04-17 13:43 [#01881461]
Points: 8670 Status: Lurker



is here anyone using a dj mikser in which you can change
the crossfader curve?

if you could please take the cover of your mikser and look
inside i would be really grateful. i wanted to ask if the
crossfader curce is just regulated by a simple knob or is
there a whole mechanism for it?

why am i asking? i have an old reloop rmx-2 mikser which is
just to old to sell but not old enough to throw away. i
wanted to buy some new crossfader to it and make myself a
curve regulation.

i discovered that on the vestax crosses for example there
are two connectors - one for the audio and a second for
something ti change the crossfader curve. and know i repeat
my question - is there just a knob linked to it or is there
a whole electronics unit or whatever... pics would be
great...


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-04-17 16:13 [#01881541]
Points: 35867 Status: Lurker | Followup to sadist: #01881461 | Show recordbag



the curve is usually adjusted by a knob, but I guess the
knob isn't the only part of the mechanism changing the curve
and I wouldn't really know where to look... wait until
dave_g logs on and bump.. he may know.


 

offline vlari from beyond the valley of the LOLs on 2006-04-17 16:29 [#01881550]
Points: 13915 Status: Regular



I think it has something to do with voltage or optically
controlled faders. as long as I can use it to fade crosses
I'm content


 

offline Ceri JC from Jefferson City (United States) on 2006-04-18 04:49 [#01881677]
Points: 23533 Status: Moderator | Followup to sadist: #01881461 | Show recordbag



Depends on the sort you get. I've got a digital fader in
mine (PMC06 Pro D). Aside from having insanely good
longevity, it lets you have more complex things than the
basic fade between sharp/soft cut in. For example, it has a
square wave one that makes rhythmically perfect,
crab-sounding scratches a doddle. There was talk of one a
while back that was in development that you linked to a pc
via USB and could UL curves (made in a basic wave editor on
a pc) to it, but I can't remember what happened to that. I
think the more common older style ones are just some sort of
voltage thing that changes the resistance in some way to get
the effect (crossfaders are themselves essentially just
variable resistors).


 

offline sadist from the dark side of the moon on 2006-04-18 05:30 [#01881698]
Points: 8670 Status: Lurker | Followup to Ceri JC: #01881677



i want something really simple - the reloop vca cut faders
for example cost like 25 dollars a piece.

i also discovered that these reloop ones are really big -
seems like the cut regulation is already built into them...
i may be wrong.


 

offline unabomber from Palma de Mallorca (Spain) on 2006-04-18 05:37 [#01881699]
Points: 3756 Status: Regular



To keep it simple, use a mixer with no faders


 

offline Ceri JC from Jefferson City (United States) on 2006-04-18 05:48 [#01881705]
Points: 23533 Status: Moderator | Followup to unabomber: #01881699 | Show recordbag



I think that calls for the scratch sample, "No-nu-no no
fader!"

I've used faderless mixers for DJing before and really don't
get on with them. I've quite often just used the upfaders
(IE no crossfader), but other than better longevity of the
pots compared to normal faders (if only because you can't
scratch them) I really don't see the benefits. They're also
generally really expensive too (Vestax R1, Allen & Heath
XONE V6, etc).

If you just want a cheap adjustable x-fader between 2
channels, you could try chaining this into your
existing mixer?


 

offline sadist from the dark side of the moon on 2006-04-18 11:29 [#01881875]
Points: 8670 Status: Lurker | Followup to Ceri JC: #01881705



no - rather not...

just look

it seems quite big - mine is about 1/3 of these dimensions


 

offline Ceri JC from Jefferson City (United States) on 2006-04-18 11:41 [#01881885]
Points: 23533 Status: Moderator | Followup to sadist: #01881875 | Show recordbag



I wasn't talking about trying to shoe-horn that fader into
your mixer! :)

I meant you put that mixer going into one channel of your
current one, so you effectively have a 3 channel mixer (one
will be spare on your current mixer), 2 channels of which
you can xfade between with the new variable crossfader.

The only problem with chaining budget mixers is that the
signal quality degrades noticeably, whereas with better
ones, you can put several together and barely notice it.

If you still don't understand email me and I'll try to send
a photo of my setup (I operate with something similar)
showing what I mean. Hope this helps.


 

offline sadist from the dark side of the moon on 2006-04-18 11:47 [#01881887]
Points: 8670 Status: Lurker | Followup to Ceri JC: #01881885



of course i undestand you - but i rather want to keep the
setup clear and compact.

i already pimped my rmx-2 so that it just has about 1/2 the
size than the original :D i just cut a few useless thinks
out :D


 

offline Ceri JC from Jefferson City (United States) on 2006-04-18 11:51 [#01881890]
Points: 23533 Status: Moderator | Followup to sadist: #01881887 | Show recordbag



Clear and compact you say? Variable cut in crossfader you
say? You need a Vestax PMC-06 :D

6" of scratch perfection with a variable crossfader.


 

offline sadist from the dark side of the moon on 2006-04-18 12:02 [#01881897]
Points: 8670 Status: Lurker | Followup to Ceri JC: #01881890



did i say cheap as well ? :P


 

offline dave_g from United Kingdom on 2006-04-18 12:23 [#01881909]
Points: 3372 Status: Lurker



The crossfader controls a voltage controlled amplifier.
Traditionally, the xfader would have channel x audio at one
end, channel y audio at the other and the wiper would pick
off somewhere between the two. Move the wiper to change the
ratio of channel x/y.

With curve adjust, the crossfader controls a DC voltage,
which varies the gain of the VCAs (voltage controlled amps).
The gain is inverted on one, so as one gets louder, the
other gets quiter.

The curve adjust alters the effect the crossfader has on the
gain of the amps. I am not familiar with individual
circuits, but I guess it must vary the amount of feedback to
adjust the sensitivity of the fader or something. I've got
the RANE mixer circuits somewhere, I will dig them out and
have a look if anyone is ~really~ intersted.

I'm not really sure of the question, but basically you will
need a dedicated circuit for curve adjust, not just add
another pot, if that's what you are asking (?)

Infact this has got me interested, I'm going to have a think
about this and try and design my own curve adjust circuit
because I'm that cool and have such a life ;)

If you have the cash, get the 06D, like Ceri, the part
time Vestax salesman says. I have the 06A and that rocks
too, but hey get the D, its digital man, and doesn't have
the 1990's faux champagne cilla black luxury look. wooo.

If I sent you pics of the inside of the mixer, it wouldn't
make any sense, you need schematics my good man. If you can
read electronics, you can see the RANE circuits online. I
can give you the url if you are interested/sad enough.


 

offline sadist from the dark side of the moon on 2006-04-18 12:33 [#01881917]
Points: 8670 Status: Lurker | Followup to dave_g: #01881909



I AM interested. i am even really interested.


 

offline dave_g from United Kingdom on 2006-04-18 12:45 [#01881929]
Points: 3372 Status: Lurker



ok the RANE website has a very nice reference section :
http://www.rane.com/digi-dic.html. well worht a look anyway to find out what
things mean.

The circuits are all here for olde stuff:
http://www.rane.com/oldman.html

Try looking on the TTM54i circuits, sheet 6 of 9 to see how
its done for this mixer:
http://www.rane.com/pdf/old/ttm54isc.pdf



 

offline Ceri JC from Jefferson City (United States) on 2006-04-18 12:53 [#01881936]
Points: 23533 Status: Moderator | Followup to dave_g: #01881909 | Show recordbag



I agree with what he says. Particularly the bit about the
champagne colour of the Pro A. I've got a PMC-270A which is
the same colour and it looks about as classy as Jordan.

In all seriousness though, I'd go for a Rane unless you
really want a 6" mixer if you have to pay current prices for
the Pro D (I got £100 off mine) and if you can't stretch to
that, get a second hand Pro A and then take the face plate
off and respray it.

Good to see you dave_g. Since we last spoke I've gotten a
couple of M447s for my decks. I really wanted the Ortofon
Concorde Scratch carts, but the difference in cost (I got a
pair of M447s for £65) for the slight performance and sound
quality improvements of the concorde wasn't justifiable.
Needless to say, they track insanely well and unless the
vinyl is "big holed" or warped, you have to be really cack
handed to skip it.


 

offline sadist from the dark side of the moon on 2006-04-18 13:18 [#01881950]
Points: 8670 Status: Lurker



what else could you recomend me if i would go for a new
mixer?

the denon dn x-100 are heavily cheap now... about 800 zloty
(200 dollars) - that's about the price of a reloop scratch!


 

offline sadist from the dark side of the moon on 2006-04-18 14:01 [#01881967]
Points: 8670 Status: Lurker



okay i found something really useful - there are crossfaders
with different resistances.

most of the mixers use 50 kohm. but there are also 20 and
100 kohm crossfaders out there.

i read on a forum that someone put a higher resistance
crossfader into his mixer which resulted in a sharper cut in
his mixer... interesting


 

offline sadist from the dark side of the moon on 2006-04-18 14:50 [#01881994]
Points: 8670 Status: Lurker



i think i finally found the solution - check that out !

LAZY_TITLE


 

offline sadist from the dark side of the moon on 2006-04-19 10:24 [#01882437]
Points: 8670 Status: Lurker



bump


 


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