I'm excited to get your feedback on a new speaker design I just introduced: Steel Speaker - JOEY ROTH
It is an omnidirectional MLTL that uses the Fountek FR58EX as a full range. The amplifier is a TPA3118 based board in PBTL (bridged mono) configuration. The only filter is a first order highpass at 60hz to prevent overexcursion.
The speaker is designed to be used alone as a mono Bluetooth unit, or as a stereo pair with a passive preamp.
I developed the MLTL design using Leonard Audio's excellent Transmission Line software. An aluminum brace bisects the enclosure and splits it into a 24" line. The driver sits at about the center of the line and fires down onto the wooden sphere diffuser (which also houses the Bluetooth antenna). The heavily flared port is located a few inches from the end of the line. This tunes the enclosure to 75 hz while eliminating most harmonics after the first. A 1" felt pad is stuck to the underside of the lid right above the port (not shown in the rendering). This is the only damping material required.
I should have measurements from the production model shortly.
Thanks for taking a look,
Joey
An externally hosted image should be here but it was not working when we last tested it.
It is an omnidirectional MLTL that uses the Fountek FR58EX as a full range. The amplifier is a TPA3118 based board in PBTL (bridged mono) configuration. The only filter is a first order highpass at 60hz to prevent overexcursion.
The speaker is designed to be used alone as a mono Bluetooth unit, or as a stereo pair with a passive preamp.
An externally hosted image should be here but it was not working when we last tested it.
I developed the MLTL design using Leonard Audio's excellent Transmission Line software. An aluminum brace bisects the enclosure and splits it into a 24" line. The driver sits at about the center of the line and fires down onto the wooden sphere diffuser (which also houses the Bluetooth antenna). The heavily flared port is located a few inches from the end of the line. This tunes the enclosure to 75 hz while eliminating most harmonics after the first. A 1" felt pad is stuck to the underside of the lid right above the port (not shown in the rendering). This is the only damping material required.
An externally hosted image should be here but it was not working when we last tested it.
I should have measurements from the production model shortly.
Thanks for taking a look,
Joey
Moved to Vendors
Do you mean the black cylinder in the cutaway view? That is just a rendering and the "cup" represents the volume occupied by the FR58EX in the enclosure. It is not an accurate visual representation of the driver, which is open in the back.
54m, thank you for your kind words about the design!
Hi Joey, I just did a quick write-up of your speakers on our website (in my signature) and wanted to know if you have frequency response numbers for these speakers so I can add them to the article. Thanks Lee.
Thanks for posting the Steel Speaker. I've attached a frequency response graph. If you have any other questions about the design I'm happy to discuss.
Best,
Joey
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