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Can't find the current speaker specs

Gaust

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From my understanding the OEM, non Alpine, amp is an 8 channel amplifier with built in audio processing. There is a set of 4” and 3.5”, maybe 2”, in the front and sound bar. The 4” is in a ported enclosure and has a low pass filter to cut out most of the mid and all the high range. The smaller speaker has a high pass filter that cuts out most of the bass. I don’t believe the 4” has a crossover on the low end, cutting out the bass. You could add a “bass blocker” capacitor if you were going to use the OEM speakers.
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Cutterone

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From my understanding the OEM, non Alpine, amp is an 8 channel amplifier with built in audio processing. There is a set of 4” and 3.5”, maybe 2”, in the front and sound bar. The 4” is in a ported enclosure and has a low pass filter to cut out most of the mid and all the high range. The smaller speaker has a high pass filter that cuts out most of the bass. I don’t believe the 4” has a crossover on the low end, cutting out the bass. You could add a “bass blocker” capacitor if you were going to use the OEM speakers.
Gonna use the speakers for now but cross them over from the sub, or use a bassblocker if needed
 

Gaust

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I just pulled the OEM dash speaker. It’s 8 Ohms and 15 Watts. The hole in the dash is 80mm in diameter.
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