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In the Forum: Horn-Loaded Speakers
In the Thread: A Frankenstein Macondo - Injection channel - trying it as open baffle.

Post Subject: Progress with midbass solutionsPosted by Rewind on: 8/6/2013

Last time we wrote you thought I should focus less on tweeters and more on midbass.

I am not done yet, but I have found a very nice midbass solution. Somewhat unorthodox, maybe.

I have come to love police sirens!

Without having A/B compared it to a pair of hornloaded Fane Studio 8M, just against a direct radiator JBL2204H 12" midbass cone driver in a 40L sealed cabinet, I find them very intriguing. The most striking difference while watching movies is - footsteps. I could not hear them before with the JBL 12" midbass. Now they are present. I can hear everything that everyone is doing, including the film crew. It is unreal.

With music, the midbass horn really shines at reproducing vocals. Less so for rock music.

The horn is a DIY Goto S-150 (1.75m deep x 0.8m diameter mouth), and the driver is the FS100W police siren, that use an alnico magnet, a phenolic membrane, with a 18 mm throat. They are so simple and cheap. I will cross them at 80 Hz to 600Hz, up to a Yamaha 6681B at 600-4KHz, then at 4-8kHz a Beyma TPL-150, and then at 8kHz-40kHz, a TA 50cm long true ribbon.

The TPL-150 will be exchangeable with a livelier, but less smooth sounding compression driver tweeter. Maybe another pair of Yamaha 6681B in a smaller tweeter horn.

I modded the FS100W last night, according to the recommendations from Dietmar at Analog-Forum.de. The diaphragm assembly was raised by 2-3 sheets of O-rings made of A4 office paper. The O-rings lowers Fs to the degree that I can get sound down to 80Hz. I use 6 dB of gain in a peak shape at 106Hz with a crossover point at 80Hz. I now feel more confident that it will work together with a Labhorn subwoofer that I am building. I hope I don't have to cross the sub higher than 100Hz.

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