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<blockquote data-quote="MisterDeadeye" data-source="post: 7727317" data-attributes="member: 611015">It doesn&#039;t matter if you&#039;re using a one, two, four, or five channel amplifier. Don&#039;t listen to stupid comments.When you get back to the audio shop, ask the guy what he set the gain at, and at what volume. If he doesn&#039;t have an answer, you need to go somewhere else. What was the first sub you used, and what amp?Is your sub in a sealed, or ported box? Could you smell your subwoofer before it blew, or was there some other problem? And is there any way you can record a video with the sound you hear while using the navigation? Maybe it&#039;s possible to use different voices with your navigation system. See if the noise is still there with another voice, if possible.You usually don&#039;t want to max out the volume of your head unit because it can cause heat issues. How are your speakers set up? Are they in the stock location? Sealing up your doors will help make your speakers sound better(you can use weatherstripping as a gasket for the speakers, or get some butyl rope, modeling clay, silicone gasket maker, etc. If your doors have huge gaping holes, you can fill them with aluminum, plywood, MDF, or plexiglass covered with some kind of butyl based damper(Audio Technix sound deadener or similar), or if you have none of that, you can just use two layers of the sound deadener, one on the outer side of the door skin, and one on the inner side.If your head unit has a decent equalizer, you can also try to normalize the sound signature of your setup, or turn down the gain on your sub(if your sound guy can&#039;t fix the issue, and if you can&#039;t deaden your doors).</blockquote>

[QUOTE="MisterDeadeye, post: 7727317, member: 611015"] It doesn't matter if you're using a one, two, four, or five channel amplifier. Don't listen to stupid comments. When you get back to the audio shop, ask the guy what he set the gain at, and at what volume. If he doesn't have an answer, you need to go somewhere else. What was the first sub you used, and what amp? Is your sub in a sealed, or ported box? Could you smell your subwoofer before it blew, or was there some other problem? And is there any way you can record a video with the sound you hear while using the navigation? Maybe it's possible to use different voices with your navigation system. See if the noise is still there with another voice, if possible. You usually don't want to max out the volume of your head unit because it can cause heat issues. How are your speakers set up? Are they in the stock location? Sealing up your doors will help make your speakers sound better(you can use weatherstripping as a gasket for the speakers, or get some butyl rope, modeling clay, silicone gasket maker, etc. If your doors have huge gaping holes, you can fill them with aluminum, plywood, MDF, or plexiglass covered with some kind of butyl based damper(Audio Technix sound deadener or similar), or if you have none of that, you can just use two layers of the sound deadener, one on the outer side of the door skin, and one on the inner side. If your head unit has a decent equalizer, you can also try to normalize the sound signature of your setup, or turn down the gain on your sub(if your sound guy can't fix the issue, and if you can't deaden your doors). [/QUOTE]

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