Recently got a pair of ditton 66. And there is an abr speaker unit in the bass unit. Could anyine explian to me what the abr does as it doesnt generate any sound.
It's not really a speaker. ABR stands for acoustic bass radiator, more commonly know as a passive radiator. In theory it is tuned to pick up the sound waves from the backward stroke of the woofer pushing the radiator out forward in sync with the cone of the woofer. In reality about all they really do is look like another woofer. So people who don't know what they are think they're getting two woofers instead of one. I've had several sets of speakers with them and have never been able to hear anything at all from them simply because the sound from the woofer always drowns it out. Go figure.
Nice speakers! I'm currently on the hunt for a pair myself. I have Ditton 25s which are a step down from the 66s and I plan to turn them into 66s.
Recapping the crossovers will rejuvenate their sound and I highly recommend doing it. As someone else suggested the Celestions like power because they are fairly inefficient and also are capable of deep bass. Those two attributes make it best suited to run with something that's high powered with good current.
The ABR basically extends the low end output of the 12". It adds +3dB of volume to the bass driver, allowing the bass driver to breathe a little easier while still pushing out good amounts of SPL.