I would like to fit a lightning/surge protector somewhere in the mains supply to my audio equipment. At present I'm using a standard APC 4-way extension lead which, I'm told, in common with other series devices (i.e. something that the current has to pass through): "is very good at sensing spikes and removing them, however, they have a very negative effect on sound because they increase the impedance causing poor performance as equipment will struggle to draw the power it needs, when it needs it." The preferable alternative seems to be a device which works in parallel, and which therefore doesn't interrupt the current supply. Can anyone recommend a realistically-priced (under £100) and reliable surge-protector of this sort, or perhaps a DIY alternative?