The MS-8 fills a lot of blocks in the block diagram:
- amplified speaker-level converter
- channel summing (your L7 system has high-pass crossover filtered and low-pass filtered outputs, no ful-range output - the MS-8 sums it all back together to full-range)
- signal processing reversal - "normalization" - de-equalization
- auto equalization and time correction (using the headset)
- crossover filtering
- 8 definable preamp channels (front, rear, center, sub, etc.)
- 8 RCA outputs and 8 deck-power speaker-level outputs, mirroring each other
So in Logic 7 cars, you need most of those bullets. They can be provided by other products, or a combo of other products, but the big plus from the MS-8 is that the internal power is enough - given the efficient 2-ohm factory speakers in the Logic 7 system - to let you power some of them using the MS-8 internal power.
The channels that ALWAYS need external amplification are the underseat woofer channels. The next channels that benefit from it are the front door channels.
What taibanl is referring to is using the 600/6 on the Front High (door 4" components) and Front Low (8" woofer) RCA outputs of the MS-8, and then using the speaker level outputs of the MS-8 for Center and Rear Effects/"Side". That is a common setup with our customers. 150x2 for the woofers and 75x2 for the 4" and tweeter set.
And if you even think about cramming a 5.25 in a car where a good 4" sounds great, Santa will give you coal in your stocking for Christmas.
