Try plugging your cell phone headset output into the 3.5 mm jack you are using with the BTR. Turn the volume down on the phone and the 975. Play music with the phone and increase its volume to about half way. Then adjust the volume on the 975. If it functions normally the cable is good and the problem lies with the BTR or the phone. If the phone functions in Blue Tooth mode with other devices, the BTR is likely the issue.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner
TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv
Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner