Model Mix-up with SP‑218 / SP‑218B•Sound Prince SP‑218 is a well-known double 18” subwoofer. •Sound Prince SP‑218B is another variant (“B” version) with slightly different power ratings: 1,000 W RMS, 2,000 W peak, 4 Ω, sensitivity ~103 dB. 
Specifications
There’s no listing from known Sound Prince retailers (MACE, Gopandy, Zit, etc.) for a model named “218BX.”
• The spec sheet for “SP 218BX” that does exist is from Peavey, not Sound Prince.
• Because of this, it’s very likely that “218BX” was a typo, a mis‑remembering, or a mislabel, possibly confusing Sound Prince’s SP‑218B or SP‑218TX.
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Closest Sound Prince Models & Their Specifications
Here are the specs of the Sound Prince subwoofers that most likely match “218BX”:
Sound Prince SP‑218 (Double Subwoofer)
• Rated Power: 1,000 W RMS
• Frequency Response: 35 Hz – 450 kHz (listing likely exaggerates upper range)
