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<blockquote data-quote="Prowler573" data-source="post: 1333713" data-attributes="member: 561023">Welcome to the forum!What are you going to power with the head unit that the built-in amp&#039;s output is critically important? Please bear in mind that regardless of the figures garishly printed on the faceplate or packaging for any head unit you&#039;ll never get anywhere near 50 watts of clean, unclipped, undistorted power out of a single channel on ANY head unit.What you&#039;re looking for is a built-in crossover with high-pass settings for the speaker outputs. A &quot;high-pass&quot; filter allows all of the frequencies higher than the cutoff frequency selected by the user. A &quot;low-pass&quot; filter does the opposite...allowing all the tones below the selevted cutoff frequency to pass through while stopping everything above it from being sent to the speakers connected to that particular output. So - you&#039;ll want to high-pass filter the 6.5&quot; speakers...the exact setting will depend on the available options and how low those Memphises can play comfortably...and then you&#039;ll want to low-pass filter the subs...either at the head unit or at the amplifier. Is that ProBox a sealed or a ported box? If it is sealed when looking for substage amplifiers you&#039;ll also need a subsonic filter to keep the subs from trying to play to far below their tuning frequency which can lead to over-excursion and eventually damage to the subs.nice truck //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gifOkaySo are you looking for suggestions on head units to buy? Well - my first suggestion would be to look into the current Kenwood eXcelon units. Great SQ, feature-packed (moreso the farther up the model list you climb) and can be acquired fairly reasonably.I continually see people posting about having great luck and liking the sound of various Eclipse HUs, most of the Alpines, and the majority of the Pioneer/Premier units.Again, welcome to the forum and good luck!</blockquote>

[QUOTE="Prowler573, post: 1333713, member: 561023"] Welcome to the forum! What are you going to power with the head unit that the built-in amp's output is critically important? Please bear in mind that regardless of the figures garishly printed on the faceplate or packaging for any head unit you'll never get anywhere near 50 watts of clean, unclipped, undistorted power out of a single channel on [I]ANY[/I] head unit. What you're looking for is a built-in crossover with high-pass settings for the speaker outputs. A "high-pass" filter allows all of the frequencies higher than the cutoff frequency selected by the user. A "low-pass" filter does the opposite...allowing all the tones below the selevted cutoff frequency to pass through while stopping everything above it from being sent to the speakers connected to that particular output. So - you'll want to high-pass filter the 6.5" speakers...the exact setting will depend on the available options and how low those Memphises can play comfortably...and then you'll want to low-pass filter the subs...either at the head unit or at the amplifier. Is that ProBox a sealed or a ported box? If it is sealed when looking for substage amplifiers you'll also need a subsonic filter to keep the subs from trying to play to far below their tuning frequency which can lead to over-excursion and eventually damage to the subs. nice truck [IMG]//content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif[/IMG] Okay So are you looking for suggestions on head units to buy? Well - my first suggestion would be to look into the current Kenwood eXcelon units. Great SQ, feature-packed (moreso the farther up the model list you climb) and can be acquired fairly reasonably. I continually see people posting about having great luck and liking the sound of various Eclipse HUs, most of the Alpines, and the majority of the Pioneer/Premier units. Again, welcome to the forum and good luck! [/QUOTE]

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