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Re: My 4 Pi Build [message #97074 is a reply to message #97073] Mon, 16 October 2023 14:04 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18726
Registered: January 2001
Illuminati (33rd Degree)

Unity_Coupled wrote on Mon, 16 October 2023 13:15
Potentially there's another issue, this one not so easy (or cheap) to resolve. I suspected from the get-go that at least one of my drivers was reconed, due to the over-application of glue around the dust cap on one of the cones, and the absence of a part number stamped on the backsides.
...
Compared to the JBL data, the impedance is not as smooth above 500hz, but it doesn't seem particularly bad either. As you've said in another post, the impedance notch at around 1k is a good indicator that the cone is aftermarket.
...
I'm going to wait until I can conduct final FR measurements and listening tests before making any decisions. I paid about $300 for both drivers, and if they're good enough I'm inclined to keep using them.

I would do the same thing. Measure the response to know for sure.

Even if it's not, a recone isn't too expensive and will make the driver 100% good as new. That's one of the really great things about the 2226H driver.
Re: My 4 Pi Build [message #97179 is a reply to message #97053] Fri, 10 November 2023 13:51 Go to previous messageGo to next message
frederf69 is currently offline  frederf69
Messages: 10
Registered: November 2023
Chancellor
Thank you for this; these little details can be so important. I have not built/ put together a speaker before, but I'm seriously thinking about the 4Pi with the JBL2226H MW & B&C DE250 CD. Just one question please - how is the compression driver attached to the waveguide? H290C
Re: My 4 Pi Build [message #97180 is a reply to message #97179] Fri, 10 November 2023 14:21 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18726
Registered: January 2001
Illuminati (33rd Degree)

The compression driver mounts onto the horn with a couple of 1/4-20 bolts that are spaced 3" apart. Each mounting bolt is 1-1/2" from the center. Some call this the "standard two-hole mounting pattern."

In the case of the B&C DE-250, you could use 1/4-20 bolts but they include a couple of studs and nuts with that compression driver so I personally always use 'em.
Re: My 4 Pi Build [message #97183 is a reply to message #97180] Fri, 10 November 2023 16:38 Go to previous message
frederf69 is currently offline  frederf69
Messages: 10
Registered: November 2023
Chancellor
Thank you, much appreciated Cool
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