Looking for an owner's manual for a pair of Wharfedale Delta 30 2-way 75w speakers

The best thing to do is place a VOM meter to confirm that there are 6 ohm speakers

Probably best to buy a pair of Wharfedale 505 or 507 speakers just for the drive units - they are exactly the same and can be picked up for £40 a pair

Search for it on net.

Possibly lack of ventilation or excessive volume through difficult speaker loads.

http://media.onecall.com/Image_Products/Harman%20Kardon/harman-kardon-hk990.pdf

See page 6.

IMPORTANT: When connecting two pairs of speakers, determine the impedance of each pair

by looking on the back of the speakers, in your owner's manual, or by contacting your dealer or manufacturer.

You can listen to two pairs of speakers at the same time ONLY if the impedance of EACH speaker is NOT LESS THAN 8 Ohms.

WARNING: Do not play sets of speakers simultaneously except as recommended above.
Amplifier may overheat.

Anything in the neighborhood of 8-ohms will usually fly safely with standard audio amplifiers. At only 50w x 2 you want efficient speakers. Watch the volume as this amp may clip if driven too hard. THAT will kill any speaker.

This owner had Valdus 200's and was happy. But just about any quality speaker in the 100w range should work out.

http://www.avforums.com/forums/hi-fi-systems-separates/368695-wharfedale-s990-any-good.html

Sometimes the back does not come off, but the speaker comes out from the front...

try here
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Try contacting IAG America 951-360-6688
http://www.iagamerica.com/wharfedale/servspeak.htm

The spkrs sound like they are bi-amp spkrs, meaning you have multiple terminals on the backs of each spkr, the jumpers on the spkrs should be connected as such. Now you just connect the spkrs according to the Denon spkr conection diagram. Do not use the surround back unless you have 6 or 7 pair of spkrs

Tweeters for Valdus 500 see www.signalsuk.com