so you 've isolated your rooms.How do you connect ...

... your cables? Can someone please help on what solutions there are so that between live and control room there is a way to put through cables in the case that you don't know beforehand which and how many cable you will need. I suspect the best way is to have them preinstalled behind the insulation (between the two layers along with the rest of the cabling). But what if you want to change your mind on things later on? Is there any other more flexible way that will not compromise your insulation? Many thanks s.p.

I think it's very advisable to use conduits for the various electrical and electronic systems... This of course would mean SEPARATE conduits for 110/220 volt power, low-voltage power, audio (line levels, mikes, etc... perhaps even in separate conduits), and communications (phone, cable, etc) ... I know that the power would HAVE to be in its own conduit, and can't be shared with other systems (per CODE). It would probably be a very good idea to make sure the conduits do not touch or come even close to each other, to avoid introducing noise from the electrical and magnetic fields. If the conduits are large enough, and are constructed as much as possible from single bent (hickey-ed) conduit tubing (i.e., the insides are a smooth as possible to avoid snags), it would be fairly easy for new wires to be fished through later, if and when you need to add them. But conduits can leak sound too, so they need to be routed with isolation in mind, blocking sound that might go through the tube (air), and conducted by the tube (metal or PVC)... PVC is purportedly better than galv steel for sound, but I've heard that there is no hard evidence to back up that idea... There are other code requirements that you need to conform when working with the electrical system, including types and gauges of wires, sizes and type of conduits, distance from floor, etc... you need to research the specific code for your own locality... K

whatalob wrote:

... your cables? Can someone please help on what solutions there are so that between live and control room there is a way to put through cables in the case that you don't know beforehand which and how many cable you will need. I suspect the best way is to have them preinstalled behind the insulation (between the two layers along with the rest of the cabling). But what if you want to change your mind on things later on? Is there any other more flexible way that will not compromise your insulation? Many thanks s.p.

But conduits can leak sound too, so they need to be routed with isolation in mind, blocking sound that might go through the tube (air), and conducted by the tube (metal or PVC)... PVC is purportedly better than galv steel for sound, but I've heard that there is no hard evidence to back up that idea...

hmm I was thinking about something along those lines (if by conduit you mean sth like a tube), but it did seem to me like something that would leek an awful lot of sound. Do you have by any chance any suggestions on how I could best limit this soundleak? thanks

Use soft-connected joints in walls (rubber sleeves, or canvas) to minimise shorting out the wall, and at least two 90 degree bends; then, after all wires are in, stuff both ends with big handfuls of insulation and caulk around the wires. Occasionally these conduits can act like big "organ pipes" and cause unwanted resonances, besides transferring sound between rooms... Steve

thanks for all replies - much appreciated