![]() What exactly were you comparing there? Was itĪ) 2i2 vs. "The noise spectrum of the SS-1 compared to the mic preamps in a Focusrite Scarlett 2i2 audio interface show a slight increase in noise floor in exchange for the gain boost." Theoretical best-case input noise density for a balanced input using LSK170s is about 1.3 nV/sqrt(Hz), that's the equivalent of a good 100 ohms, so <10 ohms of source impedance should be fine.įigure 7 is another that raises some question marks here. I would have suggested making a low-impedance passive attenuator - since output impedance of the generator itself is known to be an accurate 100 or 600 ohms (selectable), you would just need an adapter with two low-value resistors (like 5.1R) between hot and shield and cold and shield, giving you a selection of -20.6 dB or -35.5 dB, respectively. Clearly it has to be pretty quiet, but I suspect it may still be in the same order of magnitude as the SS-1 itself, which definitely is not what you want for obvious reasons. From the instrument's specs it is not clear whether output noise is even low enough to permit doing this. It almost sounds like you were just whacking the APx515 output into the input. You write you were using the APx1701, but what the SS-1 was fed from and what kind of source impedance it was seeing remains unclear. Quite honestly, I'd have trouble reproducing the test setup. That's a good set of measurements for distortion, but noise wise it all becomes much less clear. mind you, that's still good for maybe 20 m / 60' with a 3 kOhm mic input before cable capacitance intrudes on the high end. Not to mention that the device is advertised with "Boosts the signal at the source for long cable runs" but then sports almost 3 kOhms of output impedance. A mere 42 dB of CMRR seems a bit concerning, too (even if it probably was to be expected for the kind of circuit used and should be of little consequence if the device is used right at the microphone). Not exactly super great for a mic (pre)pre, is it? This is, if anything, at best on par with or slightly worse than a sub-$100 Behringer mixer (with two mic inputs and a gazillion other features). If I'm not mistaken, equivalent input noise level come out as somewhere around 0.6 µV or 0.44 µV (A). The Gold plated XLR connector is for loss-free and reliable signal connection.Click to expand.Hmm. Its slim design allows for easy placement in the studio or on stage. It has an efficient rejection of any electrical interference and noise and a high-quality finish ensures a great look for many years. Slim, Rugged All-Metal Housing With Premium Finish It drives long cable runs and can reduce susceptibility to RF interference, buzz, and hum. It provides +28dB output independent of load impedance or cable length and an extremely low output impedance. It also provides the lowest noise in its class. Its transformerless design helps in making pristine sound quality. It features a state of the art electronics and high-grade FETs that provide supremely low noise. It also provides a significantly improved level to your mic preamp for proper gain staging. The gain stays consistent regardless of the connected load. It is designed for neutral, balanced sound quality and it is the perfect way to boost the signal of a passive microphone. +28dB Of Clean, Consistent Gain, Independent Of Load Reliable operation even in demanding on-stage applications in difficult environments is ensured by the roadworthy and slim all-metal design, robust construction, and high-quality manufacturing standards. Its output impendence is also the lowest in its class, allowing it to drive long cable runs while reducing susceptibility to RF interference, buzz, and hum. ![]() Whether you’re a podcaster, recording engineer, or running live sound, the DM1 is the perfect way to boost the signal from a passive mic, reduce the likelihood of interference, and provide a significantly improved level to your preamp all without adding noise or coloration. Additionally, the gain it provides is always a consistent +28dB regardless of the connected load, thanks to its dedicated buffer amplifier. With a sophisticated class-A design and specially-selected high-grade FETs, the DM1 has vastly lower output impedance and nearly half the noise of anything else on the market. The DM1 Dynamite is an ultra-slim active inline preamp that fits seamlessly between your mic and mic pre, providing a massive +28dB of clean, transparent gain for all your dynamic and passive ribbon microphones making it perfect for podcasting, recording, or live sound. Some mics need a lot of gain - and not all preamps are up to the challenge. SE Electronics DM1-MIC-PRE Dynamite Active In-Line Preamp
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