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#1
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
patchbays
i have one [ok it;s a behringer ultrapatch px3000] i've noticed that, in 'thru mode', for each 'module', it a. connects ground from front to back [which is good] but b. also connects grounds from top to bottom [which isn;t, for what i want to do - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] are there any patchbays that do this right [ie, top and bottom grounds not connected to each other in thru mode]? i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. or is there some reason it does this, and i should just re-wire to avoid this kind of issue? thx wle. |
#2
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patchbays: ground connections from top to bottom in THRU mode
"wlexxx" wrote in message ... patchbays i have one [ok it;s a behringer ultrapatch px3000] i've noticed that, in 'thru mode', for each 'module', it a. connects ground from front to back [which is good] but b. also connects grounds from top to bottom [which isn;t, for what i want to do - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] are there any patchbays that do this right [ie, top and bottom grounds not connected to each other in thru mode]? i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. or is there some reason it does this, and i should just re-wire to avoid this kind of issue? thx wle. I wouldn't dream of putting speakers and amplifiers anywhere near a patchbay. The potential for catastrophic events are just too huge. Not to mention the crosstalk ...... Gareth. |
#3
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patchbays: ground connections from top to bottom in THRU mode
On Oct 21, 1:54*pm, "Gareth Magennis"
wrote: "wlexxx" wrote in message ... patchbays i have one [ok it;s a behringer ultrapatch px3000] i've noticed that, in 'thru mode', for each 'module', it a. connects ground from front to back [which is good] but b. also connects grounds from top to bottom [which isn;t, for what i want to do - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] are there any patchbays that do this right [ie, top and bottom grounds not connected to each other in thru mode]? i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. or is there some reason it does this, and i should just re-wire to avoid this kind of issue? thx wle. I wouldn't dream of putting speakers and amplifiers anywhere near a patchbay. *The potential for catastrophic events are just too huge. *Not to mention the crosstalk ...... Gareth. i may end up taking them out or putting them on a separate bay wle. |
#4
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
patchbays i have one [ok it;s a behringer ultrapatch px3000] i've noticed that, in 'thru mode', for each 'module', it a. connects ground from front to back [which is good] but b. also connects grounds from top to bottom [which isn;t, for what i want to do - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] This is good or bad, depending. are there any patchbays that do this right [ie, top and bottom grounds not connected to each other in thru mode]? A regular wired patchbay will allow you to add or remove soldered jumpers to configure this as you like. i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. This seems silly. How often are you going to change it? or is there some reason it does this, and i should just re-wire to avoid this kind of issue? There are several ways to configure grounds in patchbays. Remember, the rule is that everything needs to have one and only one path to the grounds on everything else. There are a lot of different ways to achieve this, including star grounds, ground busses, etc. It doesn't really matter how you do it as long as you do it one consistent way. Regular solder-type patch bays allow you to configure this stuff however you like. The cheapo configurable ones don't really give you a lot of options, but they are a lot cheaper and don't require any soldering to install. When the cheapo configurable ones were designed, nobody was thinking about doing things like running line and speaker level connections through the same patchbay. If you want to do that, you might want to consider a seperate bay for the line signals, hopefully something with a lot more contact area than a 1/4" phone plug. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. This seems silly. * How often are you going to change it? well it;s a lab all the time the behringer has switches, and i have come to use it a lot or is there some reason it does this, and i should just re-wire to avoid this kind of issue? There are several ways to configure grounds in patchbays. *Remember, the rule is that everything needs to have one and only one path to the grounds on everything else. *There are a lot of different ways to achieve this, including star grounds, ground busses, etc. *It doesn't really matter how you do it as long as you do it one consistent way. plus i think speaker 'grounds' aren;t necessarily grounds, just returns for the amp so having them in there may always cause problems Regular solder-type patch bays allow you to configure this stuff however you like. *The cheapo configurable ones don't really give you a lot of options, but they are a lot cheaper and don't require any soldering to install. yeah i don;t want soldering wle. |
#6
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
plus i think speaker 'grounds' aren;t necessarily grounds, just returns for the amp so having them in there may always cause problems That depends on the amp. Some have a real reference ground, some do not. But you can buy a Speakon patchbay... they are very common in theatre installations where a large number of speakers may be operated by a smaller number of amps. Regular solder-type patch bays allow you to configure this stuff however you like. =A0The cheapo configurable ones don't really give you a lot of options, but they are a lot cheaper and don't require any soldering to install. yeah i don;t want soldering Soldering is good, it means you can configure the thing precisely the way you like, and it means the connections will stay solid and nothing will become loose. Also, of course, most of the cheapies use short-frame plugs instead of the regular long-frame types, which means a big difference in reliability. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#7
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
i think speaker 'grounds' aren;t necessarily grounds, just returns for the amp so having them in there may always cause problems So just connect your speakers with the tip and ring. You ARE using TRS patchbays aren't you? If not, that could explain your crosstalk problems, with all that current flowing through the sleeve/shield wiring of the patchbay. i don;t want soldering And you don't want hard wiring. And you don't want this and that. Better get an intern. Actually, there are some "wired" patchbays that have solderless connectors that work reliably, but they're frightfully expensive. Also someone makes a patchbay that has a rotary switch to change configurations on each jack pair. It's pretty clever in that the switches are normally hidden behind a label strip. You pop off the strip to expose the switches. I can't remember who makes those, but if you look hard enough you'll find them. It's a fairly recent product. -- If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers ) |
#8
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patchbays: ground connections from top to bottom in THRU mode
On Oct 21, 6:38*pm, Mike Rivers wrote:
wlexxx wrote: So just connect your speakers with the tip and ring. You ARE using TRS patchbays aren't you? yes but i don;t want to make weird connectors for the speakers i think i am just going to isolate the speakers the 'modules' don;t have common grounds just the top bottom front and back of a single 4 point connection module If not, that could explain your crosstalk problems, with all that current flowing through the sleeve/shield wiring of the patchbay. i don;t want soldering And you don't want hard wiring. And you don't want this and that. Better get an intern. Actually, there are some "wired" patchbays that have solderless connectors that work reliably, but they're frightfully expensive. Also someone makes a patchbay that has a rotary switch to change configurations on each jack pair. behringer, samson, at least, have individual switches they aren;t hidden though what i am finding out is that common-4-point ground seems to be the normal way it;s done a samson FAE wrote and said theirs do that too It's pretty clever in that the switches are normally hidden behind a label strip. You pop off the strip to expose the switches. wle. |
#9
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
On Oct 21, 6:38=A0pm, Mike Rivers wrote: wlexxx wrote: So just connect your speakers with the tip and ring. You ARE using TRS patchbays aren't you? yes but i don;t want to make weird connectors for the speakers Using 1/4" plugs for speakers isn't weird already? someone makes a patchbay that has a rotary switch to change configurations on each jack pair. behringer, samson, at least, have individual switches they aren;t hidden though what i am finding out is that common-4-point ground seems to be the normal way it;s done If you look in real studios, not studios using ****ty short-frame plastic bays, you will find that in real life it's all over the place. Some folks run all the grounds in the bay to a common ground buss. Some folks lift all the grounds on inputs and run them through isolated on outputs. There are as many different ground configurations as there are studios, but they ALL follow the rule that there is one and only one path to ground from any piece of equipment to any others. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
On Oct 21, 6:38 pm, Mike Rivers wrote: So just connect your speakers with the tip and ring. You ARE using TRS patchbays aren't you? yes but i don;t want to make weird connectors for the speakers What's weird about that? High and low on tip and ring, just like any other audio connections. The only thing "weird" is that there's no shield, because that's usually not used on speaker cables. -- If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers ) |
#11
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
i have some power amp-speaker connections in the bay I personally would not do that, unless I used a separate bay totally isolated from the rest of the signals. -- ha shut up and play your guitar |
#12
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
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#13
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote: patchbays i have one [ok it;s a behringer ultrapatch px3000] i've noticed that, in 'thru mode', for each 'module', it a. connects ground from front to back [which is good] but b. also connects grounds from top to bottom [which isn;t, for what i want to do - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] are there any patchbays that do this right [ie, top and bottom grounds not connected to each other in thru mode]? i would also like to have individual mode setting for each module with a switch [normal, half normal, thru], NOT via disassembly and turning modules over.. or is there some reason it does this, and i should just re-wire to avoid this kind of issue? REAL patchbays can have isolated sockets but I question your patching of speakers through one. Can't you do what you want another way ? Graham |
#14
Posted to rec.audio.pro
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patchbays: ground connections from top to bottom in THRU mode
REAL patchbays can have isolated sockets but I question your patching of speakers through one. Can't you do what you want another way ? possibly though it will require wasting jacks, rewiring, and better planning than i thought was necessary wle. |
#15
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patchbays: ground connections from top to bottom in THRU mode
REAL patchbays can have isolated sockets but I question your patching of speakers through one. Can't you do what you want another way ? Graham each module does appear to be isolated from the others but the grounds on top and bottom, within a single module, appear to be connected wle. |
#16
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patchbays: ground connections from top to bottom in THRU mode
On Tue, 21 Oct 2008 10:45:59 -0700 (PDT), wlexxx
wrote: patchbays i have one [ok it;s a behringer ultrapatch px3000] - i have some power amp-speaker connections in the bay, and if i put something else on the other module (top or bottom) it gets crosstalk from the power amp)] I'm not sure it's a very good idea to run speaker lines through this sort of unit. |
#17
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patchbays: ground connections from top to bottom in THRU mode
I'm not sure it's a very good idea to run speaker lines through this sort of unit. maybe not though it;s not really high power, maybe 20 watts wle. |
#18
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patchbays: ground connections from top to bottom in THRU mode
wlexxx wrote:
I'm not sure it's a very good idea to run speaker lines through this sort of unit. maybe not though it;s not really high power, maybe 20 watts Put each amp close to its own associated speaker so as to keep the speaker wiring as short as possible, then run the signal to it at line level. ...or use internally amplified speakers which have many other advantages too. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
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