gsawdy;310119 Wrote: > Thank you for your reply iPhone, > when the house was being built I ran lots of wires for a complete Linn > system. At that time I didn't know anything about computers as a > source nor Squeezeboxes. Installing a server/squeeze system will save > a lot of $$$$, is more versitile, and probably give better sound. Most > rooms I can get to from either the basement or the attic but I've got a > couple of rooms where the roof/ceiling comes down low on the walls and > there is no access to run more wires. I need to install the SB3 on the > wall with no visible wiring, so wall warts are a no no. > > I appreciate your concern for fire issues. I had planned on installing > 2 amp in-line fuses both in the basement and at the SB3. The RFI issue > I hadn't thought about and don't know how much weight to attach to it. > Your advice here is appreciated. Is there a way to block the rfi? > > I realize that coax is not the correct solution. Perhaps a better or > safer solution would be to take a single run from the power supply to > the attic and then inject it into the 4 unused wires in the CAT5 to > feed each SB. I could intercept the CAT5 just before it disappears > into the roof-ceiling union. > > Oh, I have the regulated power supply and no other use for it. It's an > Acopian A series so it is far better than the wall wart. > > In Edit: The cable is labelled Coleman 32041 RG6/U Quad Shield 18AGW > (It's a funny looking 8, but I think it's an eight.) And the CAT5 is > shielded. Should the CAT shield be connected anywhere? or just float?
Well it looks like this was a study in time management. The Coax cable can't power more then one Squeezebox. Its maximum current rating is 2.3 amps and just one SB3 is close to maxxing that out. The circuit would have to be a parallel circuit so that the voltage would stay constant at 5VDC and the current would vary with the load. Once the second SB3 was turned on, the current demand would exceed the rating of the Coax. Do not even think about using CAT5 to power even one SB3 (most CAT5 is rated at less the half an Amp). As to your shielding question on the CAT5, it depends on if it is really shielded or not. Fully shielded CAT5 has a metal encased RJ45 plug on each end so the whole cable is grounded to the chassis it is connected to. If the CAT5 does not have these encased RJ45s, it could have a full-length shield cover but it would not be grounded so it would not reject EMI. One last note, a two-amp fuse in the basement will not work because the current will increase with each SB3 added to the circuit. As an example, if you had wiring able to carry the load for three SB3s in parallel, the fuse at the supply would be a 10-amp fuse and each SB3 would have an inline 2-amp fuse. Possible solution (involving more work) would be to make separate drops with 16AWG two-conductor wire assuming 50-foot runs. Use an inline fuse in each run at the power supply end and connect all the fused leads to the PS positive terminal and the set the output voltage for about 5.5VDC. At 2 amps for each unit with 50 feet of 16AWG you should end up with about a half-volt line drop. Smaller cheaper wire could be used, but the longer the run the larger the voltage drop. Of course all this is using the theoretical numbers, your mileage WILL vary. Most times it is all right to use the next smaller gauge (larger number)if current handling ability and voltage drop are acceptable. -- iPhone *iPhone* 'Last.FM' (http://www.last.fm/user/mephone) Media Room: Transporter, VTL TL-6.5 Signature Pre-Amp, Ayre MX-R Mono Blocks, Vandersteen Quatro, VeraStarr 6.4SE 6-channel Amp, VCC-5 Reference Center, four VSM-1 Signatures, Runco RS 900 CineWide AutoScope 2.35:1 Living Room: Duet, ADCOM GTP-870HD, Cinepro 3K6SE III Gold, Vandersteen Model 3A Signature, Two 2Wq subs, VCC-2, Two VSM-1 Bedroom: SB3, NAD C370, Thiel 2.3 Home Office: SB3, Parasound Vamp v.3, VSM-1 Sigs Mobile: SB3, Audioengine A5 ------------------------------------------------------------------------ iPhone's Profile: http://forums.slimdevices.com/member.php?userid=13622 View this thread: http://forums.slimdevices.com/showthread.php?t=48668 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
