Wm-065 Amplifier Preamp Board Potentiometer Extension Board Tone Board Hifi Specification: Item Type: Tone Board Chip Model: 2 x NE5532, 7812, 7912 Input Voltage: AC dual 12V-18V. Structure: Dual 5532 high, middle and low, 3 sections continuously adjustable. Frequency Range: 20-20KHz Features: DC12V output, input and output 2 kinds of interfaces. Input Interface: Approx. 2.54mm / 0.1in interface, 5.08mm / 0.2in terminal. Output Interface: Approx. 2.54mm / 0.1in interface, 5.08mm / 0.2in terminal. Adjustment Type: Treble + Midrange + Bass + Total Volume Appearance Size: Approx. 100 x 43.5 x 23mm / 3.94 x 1.71 x 0.91in Mounting Hole: M3 (Diameter: Approx. 3.3mm / 0.13in) Package List: 1 x Tone Board 8 x Accessory Note: Compatible with 2.54mm and 5.08mm connectors. When using, only select one interface to input or output. Product Features Preamp Board: This preamp board can adjust the input audio signal, and then send it to the power amplifier board. Smart Design: Equipped with dual 5532 chip, the pre amplifier module works with good stability and high efficiency. Simple Using: Compatible with 2.54mm and 5.08mm connectors, the output is DC12V, and frequency range is 20?20KHz. Good Control: Enables continuously adjustment on treble, mediant, bass and volume, very simple to adjust as well. Easy to Install: Comes with M3 installation hole, the convenient installation can be quickly finished in minutes. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!