Radio royalty

[Mark Hennessy]

Purchase Tax had some interesting effects in the hi-fi world. One example I know about is the Spendor BC1, which started life as a 2-way unit. A super-tweeter was added reasonably early on in its life, which filled in the response above 13-14kHz - it perhaps didn't make a huge difference in the context of the programme material of the day, but it did help with identifying 15.625kHz line whistle! But the addition of the super-tweeter affected the level of PT charged because 3 way loudspeakers were deemed to be professional products.

http://www.markhennessy.co.uk/rogers/spencer_hughes.htm