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32 Visitor Messages

  1. The gain isnt a volume control. It matches the input of the amp with the output from the head unit. Basically its so that when the head unit is at 50% volume, the amp is too. With the gain too high, the amp can be at 80% when the head unit is at 50% and when you crank the volume up to 75%, the amp would be at 110% which causes clipping. Clipping is when youre trying to pull more voltage than the amp can deliver so it just sends everything. Itll send out a signal limited only by its input voltage at more than 10% distortion. Its usually more than double the RMS power.

    The only thing that will hurt a speaker is too much power.
  2. View Conversation
    So I can't set the gain any higher than halfway? Seems like a waste of money for an amp like that if you cant set it any higher than that. I've got it set now to about the 11 o'clock position (just under half) as reccommended by Polk for the break in period, then he said after about 30 hours I could turn it to about 1 o'clock, but I wouldn't want any higher than that. What do you think?

    And how would I have gotten 1000 watts to the sub with the gain turned up as high as I had it if the amp is only rated at 600 watts on that channel? Remember, I'm new to this, so I'm pretty dumb on it all.

    Also Polk techs told me that the 600 watt rating is for 1 ohm load and since the 1040DVC is a dual 4 ohm sub, that it would pull 2 ohms or about 300-400 watts when both +/- terminals are hooked up. That if I hooked up 2 1040DVC, I’d get 1 ohm, but only actually get about 280 watts per sub, which he said was too low and wouldn't put the subs at their full potential. Your opinion? Continued...
  3. View Conversation
    And if I got 2 of the 1040 SVC subs, it would put them at 2 ohms, which again would only pull 300-400 total watts, so if I have 2 of them I'd only get 150-200 watts per sub wouldn't I??

    I've always read that too little power on subs can ruin them and that a little too much power is better.

    Any more input you could provide on my concerns would be helpful. Thank you.
  4. Buy a a pair of MM1040 SVC models. The SVC's have a beefier voice coil. A pair of them would still pull the full 2 ohm load from the amp but it would handle the power eaiser.

    The MM1040 is a 300 watt sub so 600 is a little much for them. Also, if your sub channel gain on the amp was set any higher than the halfway position, chances are, you clipped the amp which sent out about 1000 watts to your sub and thats what killed it.

    So yeah, buy a pair of MM 10's single voice coil models and check the gain and turn it down if you need to.
  5. View Conversation
    You will have to read these messages from the bottom up with the earlier timed posts read 1st to understand them in order that I wrote them. I was only allowed 1000 characters per message so I apoligize that I had to write multiple messages.

    Any help you can give in this matter would be appreciated.
    Thank you.
  6. View Conversation
    I don't understand the ohms aspect for the amp & sub I have. The way it looks to me is that the amp puts out 600 watts at 1 ohm on the mono sub channel and the sub is rated at 350 watts for dual 4 ohms (which I think means a 2 ohm load). It seems to me there might be a mismatch between the amp and sub, but not sure because I know nothing about this. My bother seems to think the only way I can get to a 1 ohm load on this 1100.5 amp is to parallel 2-1040-DVC subs together. He believes if I just hook up the 1-1040-DVC sub that I'll just blow it again because of a mismatch on the ohms & power between the amp and sub.

    Can you tell me if I can just stick with 1 sub & make this work at high volumes and if so, what do I need to do differently? Or do I need to go with 2 subs, which I don't really want. Another option I guess could be to goto the SR104-DVC sub from polk, which looks like it might be a closer match to the amp, but don't really wanna spent that much more for that sub.
  7. View Conversation
    My cousins boyfriend who says he's got a bit of experience here (and who also has a phenominal sounding JL audio system in his GMC Jimmy) let me choose my components, made some additional reccommendations, then looked it all over for me and said it'd work great. We got it all hooked up and it worked great for about a week. It sounded exactly like I wanted. Then my sub blew and I'm not sure why. Yes, I did have it up pretty loud (probably 80% of the head units volume level at 40 out of 50, but I think I should be able to do that after sinking over $1,500 for this system). I'm buying another MM1040-DVC to replace it and want some advice on what I need to do differently to prevent this from happening again.

    continued on another message...
  8. View Conversation
    Hey there. You seem to be an expert at this car audio stuff that I'm new to, so I will ask you my questions in hopes you'll be able to help me.

    Here's what I purchased for my 2008 Chevy Malibu:

    1-JVC KW-XR810 head unit
    1-Polk Audio PA1100.5 amp
    1-Polk Audio MM1040-DVC Sub in custom made sealed box using Polk's reccommended enclosure measurements.
    1-pair Polk Audio MM651 6.5' speakers
    1-pair Polk Audio MM691 6x9 3-way speakers
    1-Street Wires 1 farad capacitor
    1-StreetWires Power Station Single Amp Kit, 4 AWG, Blue
    1-STREETWIRES SCP1450BL,14 GA. BLUE SPEAKER CABLE 50 FT.
    1-STREETWIRES ZN7450 16.4FT 4 CHANNEL RCA CABLE WIRE PLUG
    1-STREETWIRES ZN7250 16.4FT 2 CHANNEL RCA CABLE WIRE PLUG

    continued on another message...
  9. View Conversation
    Hi Mac,
    I've been browsing the forums for about a week, and had a question about your post regarding SR5250 high pass frequency. Do you think 50hz would be a safe frequency for my application?
    HU - Pioneer DEH-P600UB
    Amp - Alpine PDX 2.150 (actual 180w per channel)
    SR5250

    This is my first car audio attempt, so I want to avoid blowing my speakers, considering how much money I've invested. The 5250's aren't yet broken in, and only have a few hours on them. Right now a sub is out of my budget, but my plans are for a PDX 1.1000 powering a 12" Alpine Type X. Maybe even biamping and running the 5250's active at some point in the future. Thanks Mac
  10. View Conversation
    Sweet, thanks for that!! Yeah, the distributor is just giving me a replacement for the PA1200, so I wont be paying anything extra. I guess its Audison then. Do you know anything about this particular model - LRx 1.1k? have u heard it? I cant seem to find any reviews online...
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About MacLeod

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Age
42
About MacLeod
Biography
MECA SQ Rookie of the Year 06 ~ State Champ 06,07,08,11 ~ World Finals 2nd place 06,07,08,09
Location
Chattanooga, TN
Interests
Weightlifting, car audio competition, PC building and gaming
Occupation
Sheriff's deputy (detention officer)

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polkaudio sound quality competitor since 2005
MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

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