BACKGROUND
More bits & pieces from some communications equipment which became "spare parts farms" on the operating table (work bench)
Nothing terribly special about this particular small loudspeaker except JOLY also produces custom hi-end loudspeakers (not relevant here though) and the impedance is 16 Ohm, not the more usual 8 Ohm.
JOLY - Small Loudspeaker
Country of origin is Taiwan
Part # J57R
Impedance: 16 Ohm
500mW power handling
Paper cone (JOLY has even stamped their name into the cone)
DIMENSIONS: 57mm OD x 16mm depth
Rear central magnet is 22mm OD
Solder terminals with 150mm colour coded wires fitted
The original mounting bracket is also supplied, just in case it comes in handy
TESTING:
Basic "Go-NoGo" tests made due to it being extracted from used equipment ...
DC resistance tested at 16.7 Ohm, that's fine. Pumped some low level tones into the speaker, also fine.
I have now packed this speaker back up in a sealed, clear plastic packet
