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Prius High-Pitch Sound Post-Install
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<blockquote data-quote="pokeyouindaeye" data-source="post: 8710296" data-attributes="member: 678644"><p>Hi all,</p><p>Just installed a Kenwood KMM-X503, Hertz Hpower H604, Infinity 12" Kappa sub, and Polk DB6502+ component speakers in a 2006 Prius...</p><p>BUT</p><p>got a high-pitch sound coming-out of the component speakers that seems to relate to electrical.</p><p></p><p>- cuts-out when head-unit is off (or in standby)</p><p>- cuts-out when RCA cables (front pair) are disconnected from the amp</p><p>- cuts-out when car is sitting but on (i.e., not charging, regenerating, nor driving)</p><p>- volume adjustment does not affect it</p><p></p><p>I have tried:</p><p>- re-doing the ground on the amp = minor reduction</p><p>- re-running the RCAs along the roof, rather than alongside the floorboards (starting at the foot-well) = minor reduction</p><p></p><p>I haven't tried:</p><p>- re-grounding the head-unit</p><p>- different RCA interconnects</p><p></p><p>SO, my questions, if anyone is willing to help a fellow audiophile out:</p><p>- what would you try first?</p><p>- what's the story with single-end vs differential and how does that affect my next cable choice attempt (ref. <span style="color: rgb(44, 130, 201)"><u><a href="https://www.youtube.com/watch?v=QOagVDZLQnA&t=4s" target="_blank">"Truth about RCA cables" video</a></u></span>); I'm pretty sure neither the amp nor head-unit are differential</p><p></p><p>Potential suppliers of cables aren't great in Canada, but want to be ready to try all means next time I open-up the dash and re-run cables.... if need be.</p><p></p><p>KnuKonceptz seems to have two options for highly shielded cables:</p><p>1. Karma "twisted coaxial, triple shielded"</p><p>2. Klarity quad-shielded twisted-pair</p><p></p><p>But also, would a simple coax-type RCA potentially solve this interference? (e.g. <span style="color: rgb(44, 130, 201)"><a href="https://www.primecables.ca/p-312834-cab-5346-all-premium-2-rca-plug2-rca-plug-mm-22awg-cable-black-11-lengths-available-monoprice#sku312837" target="_blank"><u>Monoprice premium 2x RCA</u></a></span>)? My current RCAs are probably basic rubber-insulated, potentially not even twisted pair.... came from an iConnects install kit - <span style="color: rgb(44, 130, 201)"><a href="https://www.visions.ca/product-detail/23053/iconnects_8_gauge_400_watt_max_amplifier_installation_kit?categoryId=0&sku=I8400CK" target="_blank"><u>link</u></a></span></p></blockquote><p></p>
[QUOTE="pokeyouindaeye, post: 8710296, member: 678644"] Hi all, Just installed a Kenwood KMM-X503, Hertz Hpower H604, Infinity 12" Kappa sub, and Polk DB6502+ component speakers in a 2006 Prius... BUT got a high-pitch sound coming-out of the component speakers that seems to relate to electrical. - cuts-out when head-unit is off (or in standby) - cuts-out when RCA cables (front pair) are disconnected from the amp - cuts-out when car is sitting but on (i.e., not charging, regenerating, nor driving) - volume adjustment does not affect it I have tried: - re-doing the ground on the amp = minor reduction - re-running the RCAs along the roof, rather than alongside the floorboards (starting at the foot-well) = minor reduction I haven't tried: - re-grounding the head-unit - different RCA interconnects SO, my questions, if anyone is willing to help a fellow audiophile out: - what would you try first? - what's the story with single-end vs differential and how does that affect my next cable choice attempt (ref. [COLOR=rgb(44, 130, 201)][U][URL='https://www.youtube.com/watch?v=QOagVDZLQnA&t=4s']"Truth about RCA cables" video[/URL][/U][/COLOR]); I'm pretty sure neither the amp nor head-unit are differential Potential suppliers of cables aren't great in Canada, but want to be ready to try all means next time I open-up the dash and re-run cables.... if need be. KnuKonceptz seems to have two options for highly shielded cables: 1. Karma "twisted coaxial, triple shielded" 2. Klarity quad-shielded twisted-pair But also, would a simple coax-type RCA potentially solve this interference? (e.g. [COLOR=rgb(44, 130, 201)][URL='https://www.primecables.ca/p-312834-cab-5346-all-premium-2-rca-plug2-rca-plug-mm-22awg-cable-black-11-lengths-available-monoprice#sku312837'][U]Monoprice premium 2x RCA[/U][/URL][/COLOR])? My current RCAs are probably basic rubber-insulated, potentially not even twisted pair.... came from an iConnects install kit - [COLOR=rgb(44, 130, 201)][URL='https://www.visions.ca/product-detail/23053/iconnects_8_gauge_400_watt_max_amplifier_installation_kit?categoryId=0&sku=I8400CK'][U]link[/U][/URL][/COLOR] [/QUOTE]
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