Check the listing for details. Amplifier Tuning Guide. Condition: New. Listed at 9.99 USD. When you purchase amplifier guidance, what this allows me to do for you is give you a specified number where you should set your amplifier adjustments for maximum efficiency and lifespan of your subwoofers and audio system. WHAT YOU WILL NEED TO DO: Click to purchase one quantity for every amplifier CHANNEL you need to tune. Example: If you have one amplifier with 2 different tuning channels, then you will need to purchase two quantities. Then click "contact seller" and proceed to copy and paste the following questionnaire with the corresponding answers. What info you will need: Amplifier make and model Subwoofer make and model Subwoofer box port frequency Subwoofer box dimensions How many subwoofers For LESS THAN $10 I will take your subwoofer, amplifier and box information, and calculate that equation into a perfect tuning guideline for you to reference. WHAT YOU GET: A written guideline for you to reference back to, for your amplifier crossovers. Maybe you have a new system, or maybe someone messed around with your crossover adjustments and you aren't sure specifically where they where set. My guidelines will not only allow you to keep track of specifics on your system but will allow you to enhance the integrity and performance of your audio characteristics, by keeping your subs breathing happily and extending the lifespan of your audio components. this can be delivered via email/text/SMS/USmail/.file/PDF etc.. FAQ HOW LONG DOES IT TAKE? after payment has been submitted, you will receive your final guide sheet documentation within 24-48hrs. I do typically stay in contact with the purchaser continuously so you get frequent updates until the guide is finalized. WHAT IF I DO NOT RECEIVE MY DOCS? I can submit them to you via multiple different platforms. There will ALWAYS be a way :) REFUNDS?? YES! you can cancel or refund any time BEFORE the guide sheet has already been finalized and shipped. Unfortunately after I have submitted the guide sheet to you whether received or not, there are no refunds beyond that point. Any other questions, feel free to ask!