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Low Earth Orbit
DIY Audio
Refurbishing KF750s
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<blockquote data-quote="Peter Morris" data-source="post: 207290" data-attributes="member: 652"><p>I had some of the early 750's - I eventually did some testing with some accelerometers and discover the resonance issue, wrote a paper and sent it off to EAW. They then made some calcium load horns that fixed the problem. Latter an improved cover for the 10" driver was release. There were a bunch of errors with some of the original GF settings (that took some arguing to get fixed)...and ...and ... eventually they got the box to working really well, but by then it had a bit of a bad name and Line-arrays were becoming the trend. Fundamentally even by today's standards its a great design and can sound absolutely fantastic.</p><p></p><p>Just out of interest a friend of mine was using the Beyma HF driver used in the 750's in their boxes. There was a resonance issue caused by a cavity inside the driver near the VC. It was causing a bit of a dip in the response. He actually made a mathematical model of the drivers internals and recommended a design change that I think Beyma implemented. </p><p></p><p>Good luck with these Helge <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 207290, member: 652"] I had some of the early 750's - I eventually did some testing with some accelerometers and discover the resonance issue, wrote a paper and sent it off to EAW. They then made some calcium load horns that fixed the problem. Latter an improved cover for the 10" driver was release. There were a bunch of errors with some of the original GF settings (that took some arguing to get fixed)...and ...and ... eventually they got the box to working really well, but by then it had a bit of a bad name and Line-arrays were becoming the trend. Fundamentally even by today's standards its a great design and can sound absolutely fantastic. Just out of interest a friend of mine was using the Beyma HF driver used in the 750's in their boxes. There was a resonance issue caused by a cavity inside the driver near the VC. It was causing a bit of a dip in the response. He actually made a mathematical model of the drivers internals and recommended a design change that I think Beyma implemented. Good luck with these Helge :-) [/QUOTE]
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