Mid Bass

[adio25 10+ year member]

Hey guys I'm new to this forum. My setup is an Alpine Type-r 12", Alpine MRP-M500, Pioneer DEH-P4000UB with 4x Pioneer 3 ways. My problem is that my mid bass is very quiet. The lows are extremely loud but when on a song say T.i. - Top back when it goes to a mid bass beat in the song it sounds about 10x quieter than how the lows in the song sounded. I have my HPF at 80hz and LPF at 100hz on both the amp and deck. I'm thinking my 1.2 cubic ft sealed box is too big so it's not able to hit the high bass well when alpine recommends somthing like .65in to 1ft. Thanks guys. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Click to read more...

 

[alexregalgs 10+ year member]

if ur mid-bass is lacking its not a sub issue its ur front stage that needs to be upgraded... i.e. get a component setup and this will easily give u the mid-bass ur lookin for

 

[audioholic 5,000+ posts]

Hey guys I'm new to this forum. My setup is an Alpine Type-r 12", Alpine MRP-M500, Pioneer DEH-P4000UB with 4x Pioneer 3 ways. My problem is that my mid bass is very quiet. The lows are extremely loud but when on a song say T.i. - Top back when it goes to a mid bass beat in the song it sounds about 10x quieter than how the lows in the song sounded. I have my HPF at 80hz and LPF at 100hz on both the amp and deck. I'm thinking my 1.2 cubic inch sealed box is too big so it's not able to hit the high bass well when alpine recommends somthing like .65in to 1in. Thanks guys. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Pioneer 3-ways aren't gonna give alot of midbass. Subwoofers are not suppose to output alot of midbass.
Why do you appear to have a gap between 80-100hz? LP your 3-ways as low as possible. In fact, Id LP them too low, blow them, and then have an excuse to upgrade. Like said above, midbass should come from your front stage, not the sub.

And a larger sealed enclosure would lower the system's frequency response anyway, not raise it.

 

[adio25 10+ year member]

Pioneer 3-ways aren't gonna give alot of midbass. Subwoofers are not suppose to output alot of midbass.
Why do you appear to have a gap between 80-100hz? LP your 3-ways as low as possible. In fact, Id LP them too low, blow them, and then have an excuse to upgrade. Like said above, midbass should come from your front stage, not the sub.

And a larger sealed enclosure would lower the system's frequency response anyway, not raise it.

Well its not a true mid bass, if i had to guess when the sub goes quiet is after about 60hz or so.

 

[headless 10+ year member]

nobody else noticed that he has his lp and hp crossovers on both the amp and the deck?

Turn one or the other off. You don't need to be running 2 crossovers...doing so results in nasty holes in frequency response. LP @ 80hz and HP @ 80hz - ONLY on the amp or ONLY on the deck - choose one and use it.

Oh, and it's not cubic inches, dude, it's cubic FEET.

 

[audioholic 5,000+ posts]

nobody else noticed that he has his lp and hp crossovers on both the amp and the deck?
Turn one or the other off. You don't need to be running 2 crossovers...doing so results in nasty holes in frequency response. LP @ 80hz and HP @ 80hz - ONLY on the amp or ONLY on the deck - choose one and use it.

Oh, and it's not cubic inches, dude, it's cubic FEET.

What? You can run filters on both your amp and deck without any 'holes' provided you set them correctly. Sometimes this is desirable to increase your slope.

 

[headless 10+ year member]

What? You can run filters on both your amp and deck without any 'holes' provided you set them correctly. Sometimes this is desirable to increase your slope.

Running 2x12db x-overs @ 100hz does not equal 1x24db @ 100hz.

For example, a 12db per octave x-over that reaches -3db @ 80hz (that's the crossover point) starts cutting frequencies 1/4th of an octave above 80hz - thus 1 octave = -12db, or 1/4th of an octave = -3db. A 24db per octave crossover only needs to start cutting frequencies 1/8th of an octave above it's crossover point. Thus 2x12db crossovers would actually give you a totally skewed x-over point (-3db) that isn't actually where you set the crossover point at all.

Sure, you might like how it sounds.... and i'm sure you could even graph/calculate the new x-over point...but if this guy has 2x12db x-over's @ 100hz, he's probably got a HUGE hole in response, especially considering his sub is crossed twice @ 80hz so is doing the same thing on the other side of the spectrum.

 

[adio25 10+ year member]

Well I turned my LPF on my amp all the way up(200hz) and set it on my deck at 125hz, and it seems to have made it somewhat better so i'm happy. I think my major problem is the box is too big. Thanks for all your input.

 

[iamamp3pimp 5,000+ posts]

yea if you just want to hear it, then you did the right thing

if you wanna hear it right, drop some coin and come back here for opinions.

//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[adio25 10+ year member]

I have another question. What should my gain be on my amp if my HU has 4v preamp outputs? I have it on +.5v but it's probably not a good idea I'm guessing?

 

[headless 10+ year member]

Your major problem isn't that the box is too big. Regardless of box size, your sub isn't supposed to play above 80hz. Likewise, your mids should play down to that frequency but not much lower. To get those results, your high pass filter for your fronts should be OFF on either the deck or the amp, and then set to 80hz on whichever you leave on. Your low pass filter for your sub should be OFF on either the deck or the amp, and set to 80hz on whichever you leave on. 125hz or 200hz either one is too high for either low or high pass filters for your setup. 100hz would be as low/high as i would cross a sub or front midbass's over. 80hz is a more realistic LP crossover setting for a sub... my old setup had both my fronts and my sub crossed over @ 63hz, though your front speakers will probably not get that low. Thus 80hz for both your sub and fronts crossover point. ONE 80hz filter on each.

The way you have things set right now is ****ed.

 

[adio25 10+ year member]

Well on my amp the cut off has to be set on something I just put it on 200hz and also my deck makes you choose a sub cut off frequency for the sub output which i have at 100hz now. And I need to have my high pass at 50hz or higher otherwise my speakers distort trying to play the lows when cranked up since they are just connected to the deck.

 

[RAM_Designs 5,000+ posts]

I don't have my midbasses HP'd at all right now since I'm sub-less...beat that. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif