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jalat

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Posts posted by jalat

  1. Posted

    thermal protection? is the amp hot?

    Measure voltage at the power\ground terminals instead of the rear battery.

    If neither lead to the answer.. i would check that ohm load again with the stereo off.

    Nothing else would make sense if it's not low voltage, heat or low ohm load... These are the three main things that causes protection faults at high volumes.

    Heat seems to be a large issue. 5 minutes into playing and its getting very warm to the touch. Amp is mounted on the back of the enclosure with rubber spacers to reduce vibration.

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  2. Posted

    well, i'm not keen to memphis equipment but just on the protect mode itself, when you play a test tone, does the sound of the sub change right before it goes into protect?

    You will need to be listening to the front fo the sub to be able to tell.

    IF the sound output from the sub changes and sounds odd right before going into protect, you may have a signal issue causing the amp to go into protect.

    I recently diagnosed a vehicle with that issue locally who is running a sundown 3000d. His preouts on his head unit needed to be grounded due to some defect in the headunit.

    No awkward sounds. Just shuts off, and comes back on, basically going in and out of protect mode until you back off the volume. No sudden popping or anything like that.

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  3. Posted

    maybe you don't have enough power?

    I got a buddy on here runnin 2 10s ported off of 2000w and those subs want more power.. just a smaller box.

    We can't add more power to his current box because they move too much right now.

    It sounds decent but i know they can get louder.

    He did a 140.2 on music with the car off with that setup off a 35A fuse.

    I'm pretty sure he can surpass a 142.5 with the car on with test tones but never really tested it since he doesn't compete in that method.

    Gonna try and get him a 145 with the car off before the competing season is over in the trunk with the same setup.

    The amp is rated for 1500 rms @ 2 ohms. The SSD's are stock, with no options. On the other forum i'm part of (canadiancaraudio.com) many are saying that the older memphis amps are very tempermental. I'd like some American point of views lol

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  4. Posted

    sealed box is probably why. You are probably more used to listening to ported designs.

    Play some tones or music above or around the 50hz range, i'm sure that area is decently loud in that box.

    Get a dmm and measure ohm load at amp's terminals with the stereo completely off.

    You should be reading no lower than ~1.3 ohms (after accuracy compensation)

    If it's reading 0.6-0.8 or 2.8-3.2, it's wired incorrectly.

    I know for a fact that the woofers are wired correctly. Its something I always triple check. You are right about being used to ported enclosure, but at the same time, songs with higher freq notes just dont sound as loud as they should.

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  5. Posted

    Just finished an install today on a friends car (1994 Toyota Corolla) It consists of the following:

    Alpine CDA 9884

    2 10" Fi SSD (brand new, no options) in a 1.35 cubic foot sealed enclosure

    BIG 3 (4 AWG)

    Stock batt up front, Motomaster Elimintaor in the rear

    4 AWG wiring throughout

    Memphis 16-MC1500D @ 2 ohms

    For some reason, after no more than 10 minutes of test tones (from 25hz to 40hz) at around 75% volume the amp goes in and out of protect mode. All we were trying to do was loosen the woofers up a bit. Car was started, and gains weren't even at full potential.

    Fuse holder w/ voltage display states that the voltage was around the 11.8V range before it went into protect (cars heater was on, voltage taken at rear batt)

    We then went out fro a drive, and was listening to a variety of music. To my ears, this system doesnt sound anywhere near what it should sound like. For a 1500rms amp, it seems as though its no more than 600rms to the ear. Now I do realize that the woofers are brand new and aren't fully broken in, as well as the enclosure being a prefab sealed one (for the time being)

    Can anyone point me in the right direction as to why the amp is going in and outta protect mode?

    Also, why is it not sounding near its full potential?

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