Found Replacement Speakers for Mach 460

I am studying the mach 460 sound system for better replacement while keeping things as stock looking as possible. The 6x8 woofers are 8 ohm wired for 4 ohm load. JL audio makes an 8 ohm 6.5" subwoofer with little more than a 4" mounting depth. It will handle the same frequencies as stock up to the 300 hz low pass cutoff. Two of those should work fine in the rear deck as FlemWorld lists the box as having 8" of room. However the front doors are only 3 9/16's. If anyone knows off hand if thats from the sheet metal or the adapter I'd like to know because its close to another inch of room with the spacer and that's enough for it to fit.

As for the midrange/tweeters, I haven't found any 2.5" speakers. 3.5's look like they will work but I haven't test fitted any, if someone has tried let me know. The rear deck could be modified for them but the tweeter pods in the doors pose the problem. The high pass filter is at 300 hz for the tweeters/midrange so aftermarket 1" tweeters will not work as they don't go below 2,500hz. That would create a hole in the frequency response. Most 3.5" speakers will work from 150hz and up, along with having a separate tweeter on the high end models it would round out the system and plug into factory wiring.

To those that haven't examined a mach 460 6x8 woofer they are built more like a subwoofer. The surround is much larger then a comparable full range speaker. Aftermarket full range speakers will not handle the lows that the stock one's will.

Does anyone know where to fit a speaker up front to take care of the 300hz-22khz frequencies?

I have pictures that I'll try and upload later of the stock speakers. No aftermarket speaker of comparable size is going to produce the bass that these do. They are built like subwoofers, the surround extends to the cone about 1" vs an aftermarket midrage/midbass that only has 1/2". These will play clean while most others will distort below 60 hz at high volume.

If you go with a 2 part component setup your missing alot of midrange detail that a 2.5-4" speaker will provide. My big stereo vehicle was a Bronco with the following setup:
- 6 3/4" Kenwood Components in front doors, with tweeters behind the grilles.
- 5 1/4" Kenwood Components in rear side panels with tweeters behind the grilles.
- 40x4 Alpine Amplifier
- 3 MTX 10" subwoofers in sealed box
- Kenwood 500 x 1 Amplifier.

In comparison to the mach 460 this system was louder and had more bass punch, but the midbass detail from 60-120 hz was lacking in the sound stage, it was all coming from the rear. The Components could be driven to equalize this but they would distort at high volume. To run clean I needed a high pass filter at 80 hz. The mach sound system doesn't have this issue and plays cleanly at higher volume but it could stand to be more powerful and have more real bass punch. The super high notes in the 2.5khz range could be more detailed also.

The mach system works very well and I am not willing to trade off anything when modifying it.

I figure i'll add it in here opposed to a new thread. I am probably not the first to notice but looking at the wiring diagram for the Mach audio system the tweeters run off of a single amp a 4 ohms wired directly. So the tweeters are 4 ohms.

The woofers are wired in parallel.
View attachment 236797

There is a front and rear speaker amp. Each only gives one signal so they are not stereo but mono. The amp needs to see a 4 ohm load, so you could wire a set of 2 ohm speakers in series for that to work. Infinity offers many 2 ohm speakers and component setups.

There is still the 300 hz cutoff disadvantage but this opens up some more options.

Two one channel amps run the woofers, one 4 channel amp runs the tweeters. The left to right balance only works on the tweeters not the woofers.

http://www.flemworld.com/Mach460/MachSch/RadioDiagrams.ZIP

This was only informational. I am not looking to do anything at this time.