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I hope you guys can help me, you always have in the past.
I want to be able to use one 1/4 inch phone jack for both line level input and speaker output. I would need to connect cables from the mixer and amp to a switch. Would I need an SPST or SPDT switch?
Hopefully this is as simple as I am thinking.
Thanks,
Jeff
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Well the main question I have, is the line level input balanced or unbalanced (Balanced means isolated above the common ground / Unbalanced means one side is grounded)?
If it is unbalanced use a SPDT switch.
Balanced use a DPDT switch and you may need an isolation transformer to keep from introducing a ground loop.
DJ
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I am pretty sure it is unbalanced. How would you suggest wiring it?
As I stated, it would be one jack, one switch, and 2 source cables (for lack of a better word)
Thanks, Jef
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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I want to be able to use one 1/4 inch phone jack for both line level input and speaker output. I would need to connect cables from the mixer and amp to a switch.
For the life of me I can't understand WHY you would want to do such a thing. It goes against all conventions to even run inputs and outputs close to each other.
Wanna elaborate a little about exactly what the heck you want to do?
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Dec 2002
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Ok basically I have a panel to mount mic/speaker jacks (XLRs). I have a locking 1/4 inch jack mounted in the panel. What I wanted to do is be able to use one jack for either a speaker connection or a line level connection, and be able to switch between the two connections. I have a Mackie 406M powered mixer, if that helps at all.
If it won't work right, I don't want to do it. I know they sell selector boxes at Radio Shack.
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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MACKIES ARE AWESOME JEFF!
Kristopher
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agreed! I have had mine for about 5 years, it works great! We use Mackies at school for our plays/assemblies and they very nice.
Are you a musician or audio guy?
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Jeff I would suggest you use two jacks one for line level and one for speaker output then less chance of problems. If you insist on using a switch go with the DPDT to keep everything isolated. Its not good to switch output loads while powered and switching line level can cause major audio spikes.
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Okay, thanks for the advice. I'm going to pick up another jack today.
I guess the switchers I have seen are for all line level inputs. That makes sense.
Happy holidays!
Jeff
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Jeff, if it's a locking 1/4" jack (probably a Neutrik) it will probably be balanced. Wire it as tip - pin 2(+), ring - pin 3(-), and sleeve - pin 1(shield) of the XLR's. I am pretty sure the Mackie uses balanced 1/4" inputs wired this way as well. If you plug an unbalanced 1/4" plug into that locking jack, it will hook up tip as normal and short out ring and sleeve to make the common/ground connection.
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