George Massenburg Labs 8304 Series II Four-Channel Microphone Preamp

George Massenburg Labs 8304 Series II Four-Channel Microphone Preamp

Marsoni

M251S

$4116.50

Get it in 3 business days with 1 day shipping. Friday, May 29

George Massenburg Labs 8304 Series II Four-Channel Microphone PreampThe GML 8300 Series II Microphone Preamps, 4 channels, deliver superior transparency and precision. With transformerless circuitry, front panel phantom power, and a 1U rack design, these preamps are essential for high fidelity, uncolored audio reproduction in professional settings. GEORGE MASSENBURG LABS 8304 Series II Four Channel Microphone Preamp The GML 8300 Series II Microphone Preamps set the industry standard for pristine audio clarity and

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Nice product which solved a problem of needing USB power clamped to a very thick work table. Most power strips with a clamp do not accommodate thick tables between 1.75" and 2" so I was happy to find this one. Successfully provides power to all my USB devices even a laptop (although charging is a bit slower compared to the OEM power adapter).

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on January 30, 2026

Verified Purchase

Lyman D. Elliott

San Leandro, US

★★★★★ 5

One minor bug

Size: 10 Ft (Type B with Clamp), Color: Black

I received this today and mounted it to the table I have next to my recliner. I plugged it into a remote control outlet so I can turn everything off at once. I used two of the AC outlets for the power recliner. I then plugged a USB powered fan into one of the USB-A ports. I plugged the power cable from a set of speakers positioned next to the headrest of the recliner into the other USB-A port. I used one of the USB C outlets to charge my tablet. When I hit the switch on the remote control to turn off power to the strip before going to bed I discovered a bug. The only way I can describe it is a cross port power bleed. After killing power to the strip my speakers were still playing, not well as they had static. I discovered by trial and error that if I unplugged my tablet the problem stopped. Apparently if you have something with a battery plugged into one of the USB ports and have something plugged into the other USB ports it pulls power from the device with the battery to try and power the other devices plugged in. Other than this one problem it seems to be just what I was looking for.

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Reviewed in the United States on May 30, 2025