My spd s has a bussing soud...I have change the cable and still the same problem
I was using a 25 foot 1/4" to XLR cable from the back of the Roland directly into the Thump. As mentioned, I tried going from the Roland to a direct box with a 1/4 cable on both ends; then out from the direct box "thru"-1/4 fitting, to the XLR connection in the Mackie Thump, with a cable that had the 1/4 on one end and the XLR on the other. Still buzzing. So for grins, I hooked an XLR to XLR cable from the Direct Box Low-Z out, to the Mackie Thump, keeping the 1/4 plug going from the Roland to the Direct box and eliminating the "thru" connection from the direct box to the Thunp, (1/4 to xlr). NO BUZZ.
There is a definite loss of signal strength, ie: everything is coming through quieter, but I can raise the volume of the Thump to FULL, with no buzz, and I can raise the volume of the Roland Module to full, and still no buzz. But there is a definite loss of overall volume, I think because I am not using the direct box properly. Hmmmm. As I understand the Direct box, the IN and THRU are supposed to be used as I was, going from the Roland module to the IN, then from the THRU to the speaker. The Low-Z outs are supposed to carry a signal to a mixer, I suppose to use a FOH PA system, or for recording purposes. Still, I have no buzz. Now...........
In looking over the cords, I suddenly realized that the 25' 1/4" to XLR could be the problem. The 1/4" plug is STEREO! Not mono. Could this be the cause of my buzz? I'm thinking I have a stereo plug, so 2 wires are involved, yet I'm using it in a mono imput in the roland. Perhaps this is creating my ground loop?
After getting a 1/4" MONO to XLR adaptor, attach it to my XLR to XLR cord, go from the back of the Roland (1/4") to the speaker directly (XLR) and see if my buzz is still gone.
The problem now becomes going from the Direct box to the speaker, since it needs to be 1/4 mono from the box, and xlr male to the speaker. I cannot locate a cable like that! So, I guess the next best solution is to get an adaptor to convert one end of the xlr/xlr cable to a 1/4 mono plug. At that point I don't think the cable would still be considered a 'balanced' line though, since it goes from 3 wire at the xlr to 2 wire at the 1/4 ts plug, right? The only other solution is to continue running out of the direct box as I am, using the Low-z out xlr connection, so I can continue to use the xlr/xlr cable.
Also there was a button on the direct box, called a PAD, for -15dB, I assume that what was causing my signal attenuation. When I pushed it in and it released, I suddenly had my volume back.
May 08, 2012 |
Roland Spd-S Sampling Percussion Pad...