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Old 07-03-2007, 10:37 PM   #1
speed_crazed53
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Default need help with setup

Ok, I recently installed my new amp and sub into my car. My amp is an alpine mrd-m501 and my sub is an idq 10. I am going for sql. The problem is that it sounds terrible. My friends cheap insignia setup sounds better than mine. I am not sure what I did wrong. I wired the sub in a series. Maybe I wired something wrong..... I built the box myself out of mdf with a volume of .55 cu ft. I went through everything but cant figure it out. Also, what should I set my low and high pass filters at?
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Old 07-03-2007, 10:44 PM   #2
jaysant1
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what does it sound like. Is it making a farting noise (not a joke). If so check to be sure the box is properly sealed. Sounds kind of small for a 10" sub although I don't know the specs of that particular sub. Generally a good starting point on the crossover is 120 hz then play some music with a good bass track and keep lowering the crossover frequency untill the bass sounds the tightest and most balanced. Too low and you miss bass too high the system sounds like mudd.
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Old 07-03-2007, 10:45 PM   #3
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If the subb is a dual voice coil unit make sure both coils are wired or the speaker will sound like crap and be damaged.
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Old 07-03-2007, 11:12 PM   #4
speed_crazed53
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I am fairly certain that my box is sealed... Its kind of hard to explain how it sounds. I guess muddy. Yes I wired both voice coils.
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Old 07-04-2007, 10:37 AM   #5
TAPOUT
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Try taking the sub out of the box, and inverting it. hook it back up, and see if it sounds better. You can add up to .2 cu ft by doing this. It will help you to see if your box volume is the problem. Usually, there is a + or - 20% volume for optimum enclosure size, and the box volume needed will vary due to power. Typically if you are running more power, you can run a smaller box. When you don't have much power, you need to increase the volume of the enclosure.

Also, isn't that amp capable of running the sub in parallel? I would try this as well since it will give you more power. More power = more control and better sound quality.
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Old 07-04-2007, 01:54 PM   #6
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i screwed up lets try this again....

Last edited by Audiosavvy; 07-04-2007 at 01:59 PM.
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Old 07-04-2007, 01:56 PM   #7
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Quote:
Originally Posted by TAPOUT View Post
Try taking the sub out of the box, and inverting it. hook it back up, and see if it sounds better. You can add up to .2 cu ft by doing this. It will help you to see if your box volume is the problem. Usually, there is a + or - 20% volume for optimum enclosure size, and the box volume needed will vary due to power. Typically if you are running more power, you can run a smaller box. When you don't have much power, you need to increase the volume of the enclosure.

Also, isn't that amp capable of running the sub in parallel? I would try this as well since it will give you more power. More power = more control and better sound quality.
I don't back that. A speaker is designed to make a sound wave off the front of the woofer, there is more surface area and it is shaped to maximize dispersion. You will gain a slight amount of airspace, but not enough to make the backwards speaker sound right. I have heard some like this that sound good, but it's definitely not ideal. Most 10" woofers will work around .65-.8 minimum. In some cases I've had to use woofers like that at less than HALF their minimum airspace, and they still sound amazingly good. Speakers nowadays are much more forgiving when it comes to airspace. Make sure you dialed that amp properly, those are fairly complicated amps. I would start by turning off the amp's equalizer and boost settings, and start with the good old-fashion gain, and see if it doesn't clean it up a bit. And make sure that box is well-sealed. By the way that amp is stable at 2 ohms, if you have a dual-4 woofer, parallel that SOB. You will get around 650 watts RMS (yeah i know it's rated at 500)
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