Check the listing for details. Subwoofer Amplifier Preamp Board Preamplifier Frequency Phase Satellite Speaker. Condition: New. Listed at 8.24 USD. Subwoofer Amplifier Preamp Board Preamplifier Frequency Phase Satellite SpeakerDescriptions: Interface Description: 1.P1 connect power supply and signal output to the power amplifier board 2. Power supply + v G -V is the power supply port, connect positive and negative dual power DC +/- 12v, or +/- 15V. 3. Signal output GS, G signal ground, S subwoofer signal output, connected to the signal input of the power amplifier board. 4. PHASE: phase. 5. HPF front output: 120HZ low-cut switch. 6.LIMIT: Compression limit lamp, overload lamp. 7.signal: signal light 8.power: power light 9.LINE LEVEL: volume control 10.output L, output R: front full frequency and high pass output. 11.INPUT L INPUT R: signal input, sensitivity 1v (0dbV) 12.CROSSOVER: Frequency adjustment 80-150HZ. Size: 208x46MM Package included: 1Pcs Payment MathordReturns PolicyAbout FeedbackPayment Mathord 1. PayPal payment accepted only. 2. Items will be shipped to your eBay address. Please make sure it is correct. 3. Payment must be received 4 days after auction ended.Returns Policy 1. Customer satisfaction is our top goal. We believe our items are so outstanding. All products are quality checked. They are new and in good condition when shipped to our customers. We are convinced you will be happy with your Purchase. 2. If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 14 days of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer. 3. Please contact us first if you have any problems/questions/concerns. We will be happy to resolve any issues you may have in a cordial and friendly manner. 4. We appreciate your Postive Feedback, and will do the same in return. DO NOT leave negative feedback without first communication with us. Please allow max 2 business days for us to response. About Feedback When you satisfied with our product and services please leave us positive feedback. If a problem occurs, contact us immediately with any email request. Just contact us using the " Ask the seller a question" link on eBay. On 04-Jun-21 at 06:27:17 BST, seller added the following information: