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96terrano
07-03-2012, 17:46
im restoring this old goodmans quadro 904 tape/ radio/ tv entertainment unit and one of the bass/mid speakers doesnt work, i took the speaker box apart and cheaked wiring that was fine, ive looked on ebay but cant find a speaker the right size, any ideas where i could get one:nenau the speaker measures 10cm screw hole to screw hole

2467
(RIP) PLANK
07-03-2012, 19:22
Could you use a speaker the right size but of lower impedance and fit a ballast resistor? Briggie would be the man to answer this one:thumb2
briggie
07-03-2012, 20:44
http://uk.rs-online.com/web/p/loudspeaker-drive-units/7191973/?searchTerm=16+ohm+speaker&relevancy-data=636F3D3226696E3D4931384E44656661756C74266C753 D656E266D6D3D6D61746368616C6C7061727469616C26706D3 D5E285C772B5B2D5C2E5C732F5D292B285C772B293F2426706 F3D3926736E3D592673743D4B4559574F52445F4D554C54495 F414C5048415F4E554D45524943267573743D3136206F686D2 0737065616B65722673633D592677633D4E4F4E4526
briggie
07-03-2012, 20:51
or use two 8 ohm speakers in series ...Speaker A + Speaker B = Total Ohms Rating
8 Ohms + 8 Ohms = 16 Ohms

or like plank said a ballast resistor , but it will need to be a fairly high wattage one , unless you want to start farting about connecting resistors in paralell , much easier to find a 16 ohm speaker lol , normally found in security systems too :thumb2 but its finding one the right size for your cabinet thats the prob
96terrano
07-03-2012, 22:26
yeah, its a strange size speaker, thats the only problem, not the impedance:doh
(RIP) PLANK
08-03-2012, 18:10
how does a normal 10cm speaker compare? or could you use a slightly smaller speaker and make something to make up the difference?
96terrano
09-03-2012, 01:07
how does a normal 10cm speaker compare? or could you use a slightly smaller speaker and make something to make up the difference?

I tried a 10 cm but was about 2 cm to big:doh
(RIP) PLANK
10-03-2012, 14:21
what about and 8cm speaker? try this ebay search

http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=8cm+speaker&_sacat=See-All-Categories
96terrano
10-03-2012, 15:25
what about and 8cm speaker? try this ebay search

http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=8cm+speaker&_sacat=See-All-Categories

I think that'll work mate just measured the hole and I can mount 8cm:naughty, cheers I'll order a pair:thumb2:D