D9 External USB Sound Card
The D9 external USB sound card is the standalone listing of the D9 card, sold without a microphone in the box. It is a separate listing from the D9 with BM800 microphone kit, even though the manufacturer publishes the same specification block for both. This page describes the standalone card only, and a buyer who needs a microphone with it should order the kit instead, or supply a microphone separately.
An external sound card earns its place by giving the user controls that a bare USB microphone connection does not. Volume, echo, monitoring, and the balance between voice and backing audio are all reachable on the card during a session. For live singing, streaming, teaching, and gaming, those controls are used constantly, and reaching for software to change them mid-session is a distraction the card removes.
The published specification block is the same block published for the kit, and it is reproduced here in full. Frequency response runs from 100Hz to 20kHz, and signal-to-noise ratio is more than 65dB. Together those figures describe a card that covers the voice range and keeps its own noise below the signal. A buyer comparing this card with another should compare those two figures first, since they decide the basic sound quality of everything that passes through the card.
Power figures are practical rather than impressive, and they are worth reading carefully. The battery is 3.7V at 1500mAh, charging is DC 5V at 1A, and shutdown current is 50 microamperes. A battery card suits mobile and outdoor sessions, but its run time must be planned, and a card left in storage should not drain itself. Those are the trade-offs of battery power, stated plainly rather than hidden.
Input and output figures decide compatibility. Headphone output is 320 ohms at 10mW times two, for monitoring. Accompaniment input is up to 600mV, for backing audio. Microphone input is minus 42dB with a tolerance of 3dB, which is the level the card expects from a microphone. A buyer with an existing microphone should compare that microphone's output with this input figure before ordering, since a mismatch means either a quiet recording or distortion.
No minimum order, price, or delivery time is published for this listing, and none is stated here. Certificates are available upon request. A buyer ordering should name the standalone D9 card, not the kit, so no microphone is expected in the box. Any question about drivers, host devices, or microphone matching should be raised in the inquiry.
| Item | Specification |
|---|---|
| Frequency response | 100Hz-20kHz |
| Signal-to-noise ratio | More than 65dB |
| Battery | 3.7V / 1500mAh |
| Shutdown current | 50 microamperes |
| Charging | DC 5V / 1A |
| Headphone output | 320 ohms, 10mW x 2 |
| Accompaniment input | Up to 600mV |
| Microphone input | -42dB ±3dB |
Matching an existing microphone to this card deserves a careful check, because the card's microphone input figure decides whether the combination will work well. A microphone whose output is close to the card's expected input level will record cleanly at moderate gain. A microphone far above it will distort unless the gain is kept very low, and a microphone far below it will need high gain, which raises background noise. Those are the trade-offs to weigh before ordering the standalone card.
A regular setup routine makes the standalone card reliable in daily use. Keep the same cables, keep the card charged, keep the control settings noted for the usual session, and test with a short recording before the session that matters. A routine like that turns the card from a piece of equipment into a known quantity, and a known quantity is what live work depends on.