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Old 02-27-2014, 11:14 AM   #1
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Using very old amps

Just picked up a '14 JKU with the 730 HU and the Alpine sub in the back. I'm planning on keeping the head unit but replacing all the speakers and adding aftermarket amps for the speakers and the sub. I'm a huge fan of the search function on forums and not asking the same damn question that someone else has already asked, I'll be trying to answer all my other install questions that way, hopefully.

In a box in my basement I have two amps that are over 10 years old, but were great amps back in the day. Is it worth a try to wire them up and use them now?

One amp is an Alpine MRV-F302, it's a 4 channel 50wx4.
The other is an Alpine MRV-t503, it's a 2 channel sub amp, 2x200 or 1x500.

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Old 02-27-2014, 11:33 AM   #2
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Definitely! My amps are 18 year old autotek bts. Love ok school amps. I did uograde headunit though and it made big difference even before amps and speakers.

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Old 02-27-2014, 06:46 PM   #3
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The Alpine MRV-F302 should be fine with new 50watt 4ohm speakers. I would definitely get 4ohm Polks and not 2-ohm Infinity Kappa's or 3-ohm Infinity Reference.

The Alpine MRV-t503, should be fine too. If it is wired properly for ohms and wattage to your subwoofer. But, you'll probably need a line converter to connect everything to your stock HU.
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Old 02-27-2014, 07:48 PM   #4
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Thanks for the feedback. I'm on the fence between the LC6 and LC8 to retain fade. Kids in the backseat playing iPads, sometimes it's nice to turn those speakers off.
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Old 02-27-2014, 08:28 PM   #5
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Thanks for the feedback. I'm on the fence between the LC6 and LC8 to retain fade. Kids in the backseat playing iPads, sometimes it's nice to turn those speakers off.
Yes, you know what you need. I believe that stock subwoofer is probably not much more than 100wattRMS and the ohms are probably 2-ohm or less. If you confirm, I would look at wiring it to 100watts@2-ohm or maybe get a better 4-ohm sub @200watts RMS, and mount it in the box. I also found this spec sheet, below, on the proper wiring of it, and its wattage. It's page 19, and it contains all the MRV model subs, including Alpine MRV-t503.

http://vault.alpine-usa.com/products...M_MRV-F303.PDF
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Old 02-28-2014, 07:32 AM   #6
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I'm probably going to upgrade the sub itself as well, still researching that. Hoping to find something that can go in the factory enclosure but still sound good if I find the right sub and power it properly.
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Old 02-28-2014, 04:52 PM   #7
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If you are talking about the 8" enclosure, there are many threads about how to do the upgrade. Most require making a spacer to increase the clearing depth. A Kicker seems to be the subwoofer of choice. Something like this one, 4-ohms@200wattsRMS.

Kicker 40CWS84 CompS Series 8" 4-ohm subwoofer at Crutchfield.com
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Old 03-25-2014, 12:08 PM   #8
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These amps are likely a lot better then most modern amps...FYI-They just require more battery power. Be sure to run thick power and ground cables and you are good to go. Alpines will last forever!
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Old 03-25-2014, 08:51 PM   #9
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These amps are likely a lot better then most modern amps...FYI-They just require more battery power. Be sure to run thick power and ground cables and you are good to go. Alpines will last forever!
IMHO, modern Class D amps are much better than older Class AB amps. Class AB amps are a relic of the past, being tube amps. Class AB amps generally run hotter, and draw more power. My previous analog Class AB amp sounded much worse than my Alpine Class D digital amp. My Alpine sounded much clearer and the sound was tighter, and less distorted. It's similar to listening to an old analog tape cassette or listening to a digital recorded CD.

Now, if it was live band music, I might agree that Class AB amps are best(such as guitar tube amps). But, for recorded music, such as in car audio, I believe that Class D amps are best.

CLASS AB Amplifier Vs CLASS D Amplifier - diyAudio
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Old 04-13-2014, 02:01 PM   #10
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there is nothing that compares to any type of tube amp.. Anyone thinking so, does not know audio, nor has the experience with pure audio.. ON the few select car tubes amps you can even get out there, they are quite expensive, and if you have no budget, then is the only way to go.. If you got a unlimited budget, and want to hear music as pure and precise as it gets, then use a tube amp, with almost pure silver RCA's, will cost you, but you will never hear audio the same again
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Old 04-21-2014, 01:08 AM   #11
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there is nothing that compares to any type of tube amp.. Anyone thinking so, does not know audio, nor has the experience with pure audio.. ON the few select car tubes amps you can even get out there, they are quite expensive, and if you have no budget, then is the only way to go.. If you got a unlimited budget, and want to hear music as pure and precise as it gets, then use a tube amp, with almost pure silver RCA's, will cost you, but you will never hear audio the same again
It would be pretty safe to say in my YJ I'd be better off just throwing that money out the window because there's absolutely no way I'd hear any SQ difference between AB, D, tube, MTV amps. So, sure I could install that in my Jeep, but I wouldn't hear a lick of difference and the system would probably get stolen or swamped anyways.
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Old 04-21-2014, 09:36 PM   #12
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It would be pretty safe to say in my YJ I'd be better off just throwing that money out the window because there's absolutely no way I'd hear any SQ difference between AB, D, tube, MTV amps. So, sure I could install that in my Jeep, but I wouldn't hear a lick of difference and the system would probably get stolen or swamped anyways.
Priorities,it's all priorities man.

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