They are a poly coned. Yes a paper cone won't last but who makes a paper coned speaker any more. I've been using mine for two years and no problems... IMO most marine subs are just cheap auto subs painted white at twice the price or more. A copper voice coil is a copper voice coil, poly cone is a poly cone.

Most any auto speaker is made to handle high humidity and door speaker are made to get wet. I just never really got sucked into the whole marine audio thing, IMO is mostly just marketing.

I agree, except for head units. they have remote transmitter inputs and have better internal construction for vibration

Agree- Plus with the sony marine head units you can use the commander controller which is a fantastic remote.

Im just getting ready to start my new stereo install. I went with all Alpine stuff.

Head unit - iDA-X100M
Speakers 4 pr - SPR-M700 7"
Subs 2 - SWR-M100 10"
1 amp for subs -PDX-1.600M
2 amps for speakers - PDX-4.100M

Very similar package to what I have. I'm running all 8 of my DC gold speakers off of one PDX 4.150 and running the a PDX 4.100 bridged to power my subs. I already had the 4.100 or I would have gone with the 1.600. It will hurt my ears if I'm in the boat and crank it all the way up.

well ive got the system installed alpine head unit, pdx-4 amp and 4 jl 770's. Sounds good but I get a popping sound from the speakers when I turn it up real loud. almost sounds like a balloon popping. Im guessing that means Im giving the speakers a little more bass then they can handle, for thats when it happens is on the heavy bass hits. Im a little worried about it. Now I wish I would have bought the 5 channel amp and added a sub it would really round out the system. Still tossing around the idea,maybe another amp and 2 subs

Yep, sounds like too much power for the speakers to handle.

Hey Griff, How many batteries do you have running your system? I was figuring 2. I also have a dual battery charging module from Atkinson Electronincs I planned on putting on it.

Are your batteries completly charged? I sometimes get similar sound when they no longer are putting out 12 amps.

I run all of my stereo off of one Interstate group 29M deep cycle battery. The head unit is wired into a switch at the helm, but everything else is wired to the 29M. The head unit really doesn't pull hardly any power since the internal amp is switched to off. I have 8 speakers, 2 subs, a PDX 4.150 and PDX 4.100 bridged. I've never run the battery down so low that the stereo would cut out. I've run it at 3/4 volume 3-4 hours.
I have 2 other group 24 batteries for starting the engines.