That still doesn't really help. Model numbers of amp and sub, voice coil impedance, and whether the voice coils were wired in series or parallel would be more helpful. the amp is the Power Acoustik Class D A3000D • MOSFET Power Supply Transistors • Pulse Width Modulation Circutry • Three-Way Protection Circuitry (short, thermal & overload) • 2-ohm Stereo, 4-ohm Mono Stable (A520) • Tri-Mode Capable (A520) • Selectable Hi/Full/Low Pass Crossovers (A520) • 200mV-8V Low Level Inputs • Pre-Amp Outputs • Dash Mount Remote Gain Control (mono-block model) • Variable 12 dB 40-250Hz HPF (2 ch. model) • Variable 12dB 40-250Hz LPF (2 ch. models) • Variable 12 dB 40-250Hz LPF (mono-blocks) • Variable 0-18dB 45Hz Bass Boost • Variable 12 dB 15-40Hz Subsonic Filter (2 ch. models) • Frequency Response: 10-30kHz (2 ch. model) • Frequency Response: 15-150Hz (2 ch. model) • Signal-to-Noise Ratio: 98dB • Total Harmonic Distortion: .02% (.50% mono-blocks) • 4 ga. Power & 8 ga. Speaker Terminals http://www.poweracoustik.com/pa2006/product_AUDIO_AMP_CLASSABD.htm 18"BTL dual 2 ohm i had it wired originally in series Fs: 31.9 Hz | 31.1 Hz Re: 0.7 Ohms/coil | 1.4 Ohms/coil Qms: 6.26 | 6.42 Qes: .26 | .24 Qts: .24 | .023 Mms: 313g | 329g Sd: 1210cm^2 | 1210cm^2 Vas: 163.1 l | 163.1 l Spl: 94.9dB 1W/1m | 94.9dB 1W/1m Bl: 18.3 N/A | 27.2 N/A Xmax: 28mm * | 28mm * Rms: 2000W * | 2000W * https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=154a73b256a7bd6/shopdata/0050_Speakers/0010_BTL/product_overview.shopscript