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<blockquote data-quote="MiniVanMan" data-source="post: 2739914" data-attributes="member: 573252">It really depends on the driver you use.&nbsp; 75 watts will be fine for the Seas CA18RNX.&nbsp; The RS180 might be a little starved though.Also, don&#039;t worry about impedance.&nbsp; You can take the 8 ohm version of the Dayton RS180 and do a direct comparison with the 4 ohm, and you won&#039;t hear much of a noticeable difference.Here&#039;s a link to explain how impedance, and speaker sensitivity actually works.<a href="http://www.diymobileaudio.com/forum/showthread.php?t=31" target="_blank">http://www.diymobileaudio.com/forum/showthread.php?t=31</a>For an out of the box DIY driver that will sound good with little tuning, the Seas CA18RNX, or the P18RNX are hard to beat.&nbsp; The CA18 is a better driver when using limited processing because it rolls off on the high end naturally, and doesn&#039;t need a low pass crossover.&nbsp; It&#039;s also very sensitive and will get get decently loud off your 75 watts (about 40 actual because it&#039;s 8 ohms).If you have a head unit that has a high pass crossover so you can bandpass your mids (i.e. high pass at 80hz from head unit and low pass at 2.5k from the amp), then your speaker selection increases greatly.&nbsp; If your head unit doesn&#039;t, then you&#039;re relegated to using the amps crossover as a high pass (the Belle doesn&#039;t band pass that I know of), so you&#039;ll need a speaker like the CA18 that rolls off naturally.</blockquote>

[QUOTE="MiniVanMan, post: 2739914, member: 573252"] It really depends on the driver you use. 75 watts will be fine for the Seas CA18RNX. The RS180 might be a little starved though. Also, don't worry about impedance. You can take the 8 ohm version of the Dayton RS180 and do a direct comparison with the 4 ohm, and you won't hear much of a noticeable difference. Here's a link to explain how impedance, and speaker sensitivity actually works. [URL="http://www.diymobileaudio.com/forum/showthread.php?t=31"]http://www.diymobileaudio.com/forum/showthread.php?t=31[/URL] For an out of the box DIY driver that will sound good with little tuning, the Seas CA18RNX, or the P18RNX are hard to beat. The CA18 is a better driver when using limited processing because it rolls off on the high end naturally, and doesn't need a low pass crossover. It's also very sensitive and will get get decently loud off your 75 watts (about 40 actual because it's 8 ohms). If you have a head unit that has a high pass crossover so you can bandpass your mids (i.e. high pass at 80hz from head unit and low pass at 2.5k from the amp), then your speaker selection increases greatly. If your head unit doesn't, then you're relegated to using the amps crossover as a high pass (the Belle doesn't band pass that I know of), so you'll need a speaker like the CA18 that rolls off naturally. [/QUOTE]

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