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Old 19th July 2018
  #20
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The 215s have two settings on their crossover which Tannoy called 'LF window' for some reason. This can be either in or out.
In one of those settings it runs as a 2way ie the extra woofer runs in parallel to the DC cone. In the other setting the extra woofer gets all frequencies below 250Hz (I think), the DC cone 250-1500Hz and the DC tweeter everything above so operates as a 3way.
The latter has much cleaner mids but loses a bit in perceived bass.