HISTORY:
Oh yeah, these are old, vintage crossovers recovered from some Wharfedale (I believe) loudspeaker systems yonks ago!
In our audio post production business we often came across some very nice vintage systems (mainly in the professional field) which, if not serviceable any longer, we would salvage whatever we felt could be useful in the future - these boards are the result of that salvage work.
Problem is ... it was a LONG TIME AGO and the techie's didn't properly record WHICH manufacture/model this crossover was pulled from! I am almost 100% it is from a Wharfedale though - they were usually the only PA/Loudspeaker systems we dealt with in those days.
So if anyone has an interest in these, you will need to do some research and "homework" to figure out which systems they belong to.
The new owner will need to measure the value of the single inductor, trace the tracks and figure out the configuration being used by the designer and then set about adapting them for their own system(s), allowing for the impedances/loudspeaker characteristics being used with these crossovers. I strongly suspect these (like the Wharfedale crossovers I have listed HERE) were used in Wharfedale PA Loudspeaker systems, 2x woofers and 1x Horn - but I could be mistaken on the manufacturer (it's been a long time and the memory isn't what it used to be)
So, enough of the introductory blurb, here are the details I can provide ...
UNIDENTIFIED (PERHAPS WHARFEDALE) - Crossover PCB
PCB is identified as a 711KPRF2FPA 338S006 MAY 26 2006
No markings of any kind on the copper side
PCB DIMENSIONS: 85mm x 75mm x 18mm high
Topside some component identification is screen printed onto the PCB e.g which wires are for the HORN, which for the WOOFERS but other components are just marked with their circuit designation e.g C1, L1 etc
3 way, wired and with female spade connectors fitted
Amplifier output/Crossover input port is an old style 1/4" jack socket, signal to tip & ring - this socket is not threaded so the PCB support holds the crossover in the correct position on the loudspeaker cabinet
PCB CONTAINS:
1x inductors (value unknown) 1x MKT 5.6uF 250V capacitor & 2x 5W wirewound resistors 9.1 & 15 Ohm AND that glass envelope? It is not a fuse but a 10W lamp, commonly found in older pro crossover networks (especially Wharfedale) and these are used as a protective device so that as the input current increases (more grunt from the amplifier) the filament heats up, the resistance of the filament also increases and reduces the current flowing)
As this is a pretty important component, I checked this lamp and it is fine (NOT open circuit)
I am very big on sustainability (throw out NOTHING) and really do hope that someone has the inclination to press this crossover into service with either the correct PA Loudspeaker system OR for their own custom designed loudspeaker system.
