Carlspeak

110C restoration

3 posts in this topic

A pair of 110C's were recently retored with original tweeters and refoamed original woofers (replaced RS woofers) and a new 10 uF Dayton cap.

The 1-2 kHz crossover area did not meaure well with the RS woofers. I managed to get a pair of original woofers which only needed refoaming. Boston Acoustics filleted foams were used. I measured the box Fc which was a surprising 48 hz. I knew the end result with the correct woofers and new cap would be quite pleasing. When I took an on axis response measurement I was very pretty shocked at how flat it was from 60 hz (near field woofer) out to 18 kHz, considering the woofer was running full range and only a single cap on the tweeter (see below). Also note the polars taken on axis, 30 deg and 45 deg. Very good performance for Winslow Burhoe's novel concave tweeter design. When the owner came to pick them up I played "The Window" by David Elias from 'The Window' CD. He was flabergasted at how great they sounded.

Also note the original 10 uF cap measurement. It didn't get to 10 uF until about 70 hz and below freq. (far right column) Above that, it measured < 10 uF. ESR was also high (see column marked "real").

post-100237-0-86057600-1331942185_thumb.

post-100237-0-90439400-1331942186_thumb.

post-100237-0-41483400-1331942223_thumb.

Share this post


Link to post
Share on other sites

Wow! can you tell me the EPI woofer in the test is Butyl rubber or foam version. I suspect there may a small difference between the two versions.

Share this post


Link to post
Share on other sites

Wow! can you tell me the EPI woofer in the test is Butyl rubber or foam version. I suspect there may a small difference between the two versions.

If your question refers to the woofers in my post #1, they had new foam installed by me.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now