Need help identifying Diamond D3 400.1 amplifier specs

[Pat W]

Hi all, long time lurker but first time posting. I recently acquired two Diamond D112D4 subs and a Diamond D3 400.1 amp, and I cannot for the life of me find the official specs of the amp. I am trying to figure out whether it’s safe to wire the subs to 1 ohm or not. If anyone has any info or recommendations, I would really appreciate it!

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[deez283 10+ year member]

Google says it does 450 watts @ 1 ohm.

 

[Kayge 10+ year member]

• MS Power Output: 250W x 1 at 4 Ohms; 400W x 1 at 2 Ohms.
• Amplifier Topology: Class AB.
• Frequency Response: 20Hz – 20,000 Hz.
• Signal to Noise Ratio: >80 dBA.
• Crossover: Variable low-pass/high-pass (50Hz – 250Hz), 12 dB/octave.
• Bass Boost: Variable 0 to +12 dB at 50 Hz.
• Dimensions: 13.4" (L) x 8.7" (W) x 2.25" (H).
• Fuse Rating: 30A x 2.

Additional Features​

• Remote Level Control: Included for dash-mounted volume adjustment.
• Inputs/Outputs: Features RCA line-level inputs, speaker-level inputs, and pass-through RCA outputs for daisy-chaining amplifiers.
• Protection: Includes thermal, short circuit, and low-impedance protection circuitry with LED diagnostics.
• Terminals: Nickel-plated set-screw terminals; accepts up to 4-gauge power/ground wire and 8-gauge speaker wire.