SHORTLINK ROUTER: /go/alctron-um900 Partial Pass: 3/4 Verified (Back-Electret)

Alctron UM900 USB Cardioid Back-Electret Condenser Microphone

You followed a Spec & Craft hardware reference link (specandcraft.com/go/alctron-um900). Select your preferred storefront below or inspect the primary manufacturer datasheet before purchasing.

HARDWARE PROCUREMENT DOSSIER // DOC-ALCTRON-UM900Partial Pass: 3/4 Verified (Back-Electret)16.0 mm capsule diameterCardioid (心形指向性)

Ningbo Alctron's official manual confirms a 16 mm back-electret capsule, cardioid directional pickup, and a genuine elastic-cord spider shock mount in the box. However, it is not a gold-sputtered true condenser, and Alctron's manual and web spec tab contradict each other on frequency response.

STOREFRONT ROUTING

01 // TRANSDUCER ARCHITECTURE16 mm Back-Electret Condenser Capsule

02 // POWER & CONVERSION16-bit / 48 kHz USB audio codec, 68 dB S/N ratio, 136 dB Max SPL

03 // REF PRICE (USD PRIMARY)

$44.99(THB 1,590)

4-CLAIM DATASHEET VERIFICATION MATRIX[P] PRIMARY DATASHEET | [S] INDEPENDENT TEST | [?] UNVERIFIED

Claim 1: Gold-Sputtered Condenser Diaphragm[P] FAIL

Manufacturer explicitly specifies a '16mm back electret diaphragm capsule' (16mm背驻极体音头). No gold sputtering or Mylar grade is stated.

Claim 2: Active Capacitor Polarization Power[P] CAVEAT

Operates as a capacitor (diaphragm + backplate), but polarization charge is permanently embedded in the electret backplate. 5V USB powers only the JFET and ADC.

Claim 3: Cardioid Acoustic Polar Pattern[P] PASS

Confirmed cardioid directional pickup (心形指向性) in both official web specifications and PDF manual.

Claim 4: Spider Shock Mount Included in Box[P] PASS

Box manifest explicitly lists 'UM900 MIC / USB CABLE / SHOCK MOUNT' with elastic-cord spider suspension.

Check Price on Amazon ($44.99)Shopee Thailand (THB 1,590)Primary Spec Source [P]

specandcraft.com/go/alctron-um900

Affiliate Disclosure: As an Amazon Associate, Spec & Craft earns from qualifying purchases. We also participate in the Shopee Thailand Affiliate Program.

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ENGINEERING AUDIT NOTE [P]

Manual p. 5 specifies 20 Hz–18 kHz at -38 dB sensitivity, whereas the alctron-audio.com parameter tab specifies 20 Hz–20 kHz at -32 dB sensitivity. Always verify whether a retail bundle is the standard UM900 or the UM900V variant.