Speaker Crossover Schematic Archive

A lot of us are into second-hand speakers simply because we cannot afford shiny and new. However, a lot of times these speakers come with their own problems due to prior use and need repair. To this, a crossover schematic is extremely handy both for the repair or even ordering the necessary parts before tearing into the unit. Trouble is, schematics for many speakers are not to be found on the internet and some of those that do are grossly inaccurate.

Thus, this thread is an experimental archive of member submitted crossover schematics, official or self-created for the purpose of serving as a future reference for others.

Please be sure to identify the speaker model as text in the post as well so the schematics can be readily found via the search function.

- JP

Flatline Design Model 175 by Lewis Muratori




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Dahlquist DQ-10




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Design Acoustics D-12




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Pioneer HPM-40/U1

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Pioneer HPM-40/U2

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Pioneer HPM-60/U1

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Pioneer HPM-60/U2

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Pioneer HPM-100

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Infinity RSb

This is the official schematic from Infinity.

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Infinity RSb

Actual crossover observed in unit serial #8188596.

Midrange inductors are accurate due to value being printed on attached stickers. Those for the woofer and tweeter are unknown, but the original schematic values are added just in case.




This post has been edited by Charivari on September 17, 2006 02:05 pm

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Teledyne AR-9

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Design Acoustics PS-10

(Serial #42996/7)

Inductor values are unknown. Design looks a bit odd, but is recorded as observed.




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After looking at this photo, I came to the conclusion that the statement from the folks at Dahlquist when I originally purchased my DQ-10's directly from them, that they were tweaked, "show models" truly has merit. My crossover looks nothing whatsoever like this: all of the parts are installed in a far neater manner, and all the mylar caps are green blocks, which, to my knowledge, were never used in any "standard' production DQ-10. Even the people at Regnar were unfamiliar with the green, mylar caps.

In this photo, in the upper right, there is a relatively inexpensive, Japanese-made cap (it has the Mitsubishi logo on it), whereas that in mine is a black, American-made cap. All the resistors in mine are identified as "Rockport," though I don't know whether or not that's of any significance.

Is this a self-modified crossover, a "stock" speaker, or a mod done by someone else?

These are the original, unmodified crossovers that came with this particular set of late 1976 DQ-10s if the date stamps on the woofers are an indicator (no serials). In this picture, the midbass cap and that along with the resistors for the supertweeter were disconnected for troubleshooting purposes (bad caps and an intermittent driver). From the pictures I've seen of later DQ-10s, a single Dahlquist cap with a bypass was used in place of the dual 1060s (6.5mfd) in the lower right.

- JP