Firstly i want to thank Buster and Keyser for helping me to reinstate some bass to my Zed. Since i bought my Zed i've been really disappointed by the lack of bottom end, even when playing bass heavy music i've reached around behind my seat expecting to feel some movement from the grill covering the sub-woofer, but nothing. Buster and Keyser put me on the right track as to how to rectify this lack of
kick ass and lo and behold my kidneys are now getting a really good massaging. It is a really simple fix (isn't everything when you know what you're doing). I've since found out that Radioshack have a direct replacement for the relay, the part number is;
Catalogue number #275-005. If i have a recurrence of this problem I'll replace this relay. Thanks again to Buster and Keyser.