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#1 |
diyAudio Member
Join Date: Apr 2002
Location: Winnipeg Canada
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Hello: I just acquired these drivers; any body have any info about them?
I was told they were used in a factory passive sub about mid 1990's vintage. The person I got them from gave me no specs except for a piece of paper stating cabinet volume of 4 cu ft. & a crude diagram of the port & it's internal distance from the cabinet. No info as to where to put port front or back. I'm going to try to attach some pictures. ...................... thanks .................. Fred petersen
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fastfreddd Last edited by Fred Petersen; 9th November 2011 at 07:05 PM. Reason: to clear up message |
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#2 | |
diyAudio Member
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Quote:
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#3 |
diyAudio Member
Join Date: Apr 2002
Location: Winnipeg Canada
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Hello Michael:
Thanks for your reply; I'll be posting the diagram shortly. ...................... fred Petersen
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fastfreddd |
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#4 |
diyAudio Member
Join Date: Apr 2002
Location: Winnipeg Canada
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Here's the diagram
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fastfreddd |
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#5 |
diyAudio Member
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Hi there ZD: My interpretation of the drawing is a 4-inch diameter port, 5.75-inches long located in the front of the cabinet with the dimension from the outside of the front panel to the inside of the back panel 14-inches. The back panel to be covered with 2-inches of fiberglass (pink stuff). Along with the back, one side and either the top or botom of the enclosure needs to be covered with fiberglass. Given your stated objectives, a 4 cubic foot (internal measurements minus: any bracing,cleats, port tube volume, driver displacement) should work. The minimum tube to back dimension is 4".
....regards, Michael |
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#6 |
diyAudio Member
Join Date: Apr 2002
Location: Winnipeg Canada
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Hello Michael: Thanks for your reply I appreciate your time on this issue.
Do you or any body=else have any idea which Jamo product line used this driver or how to find out that fact?
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fastfreddd |
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#7 |
diyAudio Member
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Hi there Fred: I Googled-up Jamo sprakers and found the folloing models:
1985: PP300, 1986: CBR 120 speaker, 1987: Compact 120 speaker, 1989: Concert II, there was also a recent long site on a 909 model, however it is not a box speaker: open back model with twin 15-inchers/mid range/tweeter, a good read never the less! ...regards, Michael |
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#8 |
diyAudio Member
Join Date: Feb 2011
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the dimensions on the pic would give a port tuning of 33Hz and 3.78ft^3 of working volume. ie a woofer.
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#9 |
diyAudio Member
Join Date: Apr 2002
Location: Winnipeg Canada
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thank you very much revboden that pretty much answers my question.
I'm going to go ahead and build boxes for these drivers. I'll post pics when finished. Also thanks to everyone who sent responses to this thread. .................... Fred Petersen
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fastfreddd |
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