Just over a year ago, I picked up the Usher UA721 (in the project gallary) drivers and crossover on ebay used. I bought this kit because it was a good value and I was honestly scared to invest too much in a project that I might procrastinate or just not do a good job on the cabinet. Overall I am very happy with the speakers, they sound silky smooth and have a great low end. I knew I was more interested in doing a tower so I posted a help inquiry in the tech talk forum and Paul K graciously agreed to help and used Martin King's software to do the modeling.
Using 3/4 MDF the cabinet measures 9"W x 44.5"H x 11"D. The drivers are mounted just as they are in the project gallery. The port is located is located 4.5" above the internal bottom of the cabinet center on the front baffle panel and is a 2.5" diameter and a 7" length. The top 22" of the cabinet are filled with polyester fiber at a uniform density of 0.75 lb/ft3, requiring a total of 9-10 ounces of fiber. I used 3 window braces, one between the tweeter and upper woofer, a second one with its top 22" below the internal top of cabinet, and the third about halfway down between the middle brace and the bottom of the cabinet. The overall system tuning frequency is ~29 Hz.
I have a couple questions for you guys:
Overall I am incredibly happy with this project, I cant imagine how much better some of the higher end 3 way DIY towers sound.
Using 3/4 MDF the cabinet measures 9"W x 44.5"H x 11"D. The drivers are mounted just as they are in the project gallery. The port is located is located 4.5" above the internal bottom of the cabinet center on the front baffle panel and is a 2.5" diameter and a 7" length. The top 22" of the cabinet are filled with polyester fiber at a uniform density of 0.75 lb/ft3, requiring a total of 9-10 ounces of fiber. I used 3 window braces, one between the tweeter and upper woofer, a second one with its top 22" below the internal top of cabinet, and the third about halfway down between the middle brace and the bottom of the cabinet. The overall system tuning frequency is ~29 Hz.
I have a couple questions for you guys:
- Since the crossovers were already built, I didnt rebuild them but the negative wires for the crossover are tied together after exiting the drivers. Is this ok?
- Also, I didn't do the best job recessing the tweeter after paint and everything else, the tweeter rests a smidge above the baffle is this ok? If I was going to open up the hole is there a good way to do that using a rabbit bit?
- After painting, I noticed my MDF joins were slightly showing.. Can I fix this by just going over again with bondo, re priming and repainting? Or did I miss a sealing step to prevent this?
Overall I am incredibly happy with this project, I cant imagine how much better some of the higher end 3 way DIY towers sound.
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