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Message: <blockquote data-quote="tylaxng" data-source="post: 1650239" data-attributes="member: 16049">Pardon me... i think u misunderstand.... u know VS, rite? normally direct connect to battery terminal (parallel), i said need on/off switch 1 is this type; connect to cigerette lighter is another type, this 1 no need, bcoz when u remove ur car key, cigerette lighter voltage supply automatic turn off.ok... let us inside "simple" electronic calculation:Q= CV ; Q is charge, C is capacitance (cap value), V is voltagechange to time form:dq/dt = C dv/dt, since I = dq/dt; I is current and assume voltage is constantso above formula become:I = CVcap value (capacitance) formula become:C= I / VNow apply above formula to ur "Woofer" amp,Assume ur amp is 60W, input voltage is 12V,P = IV (power formula)I = P / Vso, C = (P / V) / V = P / (V x V) = 60W / (12x12) = 0.417Faradxxxx From above calculation, if ur amp is 60W and use car voltage supply 12V, ur ICE cap (for Woofer) value should be 0.417Farad, clear?. This formula can apply to another 2 amps also. xxxxok... let us inside another "simple" electronic calculation...Assume ur amp is 60W, and voltage is 12V again....P = IVI = P/V = 60W/12V = 5Aso, fuse value u need is: 1.5 of I = 7.5Asomethings u need notice:1. Use ceramic packaging fuse, glass packaging one easy broken.2. Try connect ur ICE cap or VS close to "Woofer" amp, better way is connect(parellel) "Woofer" amp voltage input directly.3. "simple" means ideal calculation4. buying high value cap (>10000uF) making ur ICE cap, ur purpose is "energy tank", noise filter function can ignore. But u can parellel 1 or 2 "0.1uF" (ceramic type) for high frequency noise filtering.5. Don't use low value cap for ur ICE cap (<10000uF), coz need too many cap to parellel (economy view not so good), generate leakage current more than few high value cap, and save space.</blockquote>

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