I've Joined The Tannoy Cheviot Club

[spendorman]

Would be OK with some amps, say the Quad 303, that can withstand a short circuit, I know, have done it accidentally!!!

[danilo]

As to height .. it's fairly important to locate the Driver's centre/axis at ~38" the 'usual' height of a seated listeners ear holes.
It Does make audible difference.
PS: brass or copper bolts make for Very good (if slightly inelegant) DIY Speaker terminals