You may well be happy with the difference you get with the HK speakers and not need the extra bass... It's easy to add in later if you want to and has a wired remote so you can set the levels if your head unit has no sub control.
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Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT 
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