Car subwoofer sounds muddy but hits low bass well (sluggish bass) - diyAudio
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Old 22nd June 2012, 01:47 PM   #1
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Default Car subwoofer sounds muddy but hits low bass well (sluggish bass)

hi ...

i've completed a subwoofer system with 12in subwoofer for my car use. Initial testing indoor using a normal quality car amplifier (used for my PC system) the bass is tight and well controlled.

Problems rise when it is used together with my car amplifier which has bass boost at 45Hz and i set it at a mild boost of 4dB. The amplifier setting of the crossover is at 85Hz. The sound of the bass hits very low frequency but it is not tight when playing techno or dance tracks with very fast beats ...

The amplifier is connected to a parametric preamp which has subwoofer controller.

I here also attached the graph of the predicted frequency response by WINISD, photo of the completed subwoofer, amp photo and specification.

I wonder if my box is not properly designed or my car amp have damping factor issues.

thanks for advices and solutions to my problem
Attached Images
File Type: png response 12in.png (89.7 KB, 191 views)
File Type: jpg 294947_349520001770633_434644339_n.jpg (15.9 KB, 185 views)
File Type: jpg amp view.jpg (489.9 KB, 189 views)
File Type: jpg specs.jpg (375.2 KB, 173 views)
File Type: jpg 303415_370233803032586_2044470150_n.jpg (107.9 KB, 179 views)
File Type: jpg 481145_370233723032594_1857956967_n.jpg (161.5 KB, 60 views)
File Type: jpg 431141_313431415379492_100001379080586_778594_93371773_n.jpg (223.6 KB, 42 views)
File Type: jpg 485687_355326681189965_888899795_n.jpg (85.6 KB, 45 views)
File Type: jpg 558614_355326751189958_166300003_n.jpg (86.1 KB, 47 views)

Last edited by dannyjmf; 22nd June 2012 at 01:57 PM.
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Old 22nd June 2012, 02:04 PM   #2
sreten is online now sreten  United Kingdom
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Hi,

Tune your box a lot lower or go sealed for in car use. The mud is probably
the inevitable bass overload you will get below the port tuning frequency.
Tune it down to between 33Hz and 38Hz.

55L is a big box for sealed giving a low Q of 0.47. Tuning the box to 26Hz,
an octave below the current tuning, will be better than sealed IMO here.

rgds, sreten.
Attached Images
File Type: png guff.png (28.7 KB, 42 views)
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Last edited by sreten; 22nd June 2012 at 02:16 PM.
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Old 22nd June 2012, 02:07 PM   #3
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Sealed subs are normally faster and less muddy for car use. Try stuffing the port completely and see how that goes.

Hey Danny, I'm from JB but now living in NZ. Nice to see a fellow M'sian here!
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Old 22nd June 2012, 02:11 PM   #4
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Quote:
Originally Posted by chlorofille View Post
Sealed subs are normally faster and less muddy for car use. Try stuffing the port completely and see how that goes.
I did that at home , huge difference for the better
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Old 22nd June 2012, 02:42 PM   #5
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Quote:
Originally Posted by sreten View Post
Hi,

Tune your box a lot lower or go sealed for in car use. The mud is probably
the inevitable bass overload you will get below the port tuning frequency.
Tune it down to between 33Hz and 38Hz.

55L is a big box for sealed giving a low Q of 0.47. Tuning the box to 26Hz,
an octave below the current tuning, will be better than sealed IMO here.

rgds, sreten.

Ok lower the tuning frequency. But i tried the subwoofer system before using another car amp which is used for my computer subwoofer (DIY sub also) and the bass there is tight. The amp signal feeds from a custom made bass boost circuit peaking high pass filter.

The previous version of my car subwoofer (i sold off already) also have the same issue when using the car amp the bass sound sluggish and using another amp it sounded tight and nice ...
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Old 22nd June 2012, 02:51 PM   #6
sreten is online now sreten  United Kingdom
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Hi,

A computer sub amp may have a bass roll-off to suit a boom-box bass
alignment, but it won't go deep, it probably doesn't even try to do that.

It depends also on whether the bass boost is just a 2nd order peaking EQ,
or a 2nd order peaking high pass filter what low bass distortion you will get.

rgds, sreten.
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Old 22nd June 2012, 02:55 PM   #7
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Quote:
Originally Posted by sreten View Post
Hi,

Tune your box a lot lower or go sealed for in car use. The mud is probably
the inevitable bass overload you will get below the port tuning frequency.
Tune it down to between 33Hz and 38Hz.

55L is a big box for sealed giving a low Q of 0.47. Tuning the box to 26Hz,
an octave below the current tuning, will be better than sealed IMO here.

rgds, sreten.

Ok lower the tuning frequency. But i tried the subwoofer system before using another car amp which is used for my computer subwoofer (DIY sub also) and the bass there is tight. The amp signal feeds from a custom made bass boost circuit peaking high pass filter.

The previous version of my car subwoofer (i sold off already) also have the same issue when using the car amp the bass sound sluggish and using another amp it sounded tight and nice ...
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Old 22nd June 2012, 03:08 PM   #8
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Quote:
Originally Posted by sreten View Post
Hi,

A computer sub amp may have a bass roll-off to suit a boom-box bass
alignment, but it won't go deep, it probably doesn't even try to do that.

It depends also on whether the bass boost is just a 2nd order peaking EQ,
or a 2nd order peaking high pass filter what low bass distortion you will get.

rgds, sreten.



Forget to mention ... the amp for the computer system which i used to test my New subwoofer is actually a Diy 4 channel 25W LM1875 based amp. 2 channel were bridged to test the subwoofer. And the bass boost module is also a DIY system build to suit my subwoofer system. The boost is around 4db @ 45Hz using peaking high pass 2nd order Peaking filter. Low pass was crossed at 85hz cutoff. I even tested it with another spare car amp i have it sounded tight and nice.
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Old 22nd June 2012, 04:25 PM   #9
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1. Fb is too high. 50 Hz? That's way too high. Try 30 Hz
2. Remove the bass boost @45 Hz.
3. Try orienting the box a bit differently in your car.
4. What LP filter are you using on the subwoofer? 80 Hz? Try a higher frequency. The rear seat in a sedan can act like a natural LP filter. Now add to that the LP filter on your subwoofer amp and possibly the LP filter on your deck or EQ and the effect of the driver's Le, and the end result may be that the subwoofer is simply being effectively filtered at too low a frequency for car audio use.

For some background, I use 2x12 (sealed) subs in my car. The LP filter on my deck is set to 125Hz, 12dB/octave, and on the amp 200Hz/24dB/octave. And I drive an SUV, so no "rear-seat LP filter" to worry about. Le for the subs works out at 1.5mH at a 2 ohm load.
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Old 22nd June 2012, 06:16 PM   #10
OscarS is offline OscarS  United States
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I completely agree with Brian. If you need "bass boost:", then you just don't have enough subwoofer or amp, period. Tune that box right (low 30s), bump up the LPF to 100 or 110. Or just get a different amp. Remember, we just can't hear what you're hearing and can only go by your description, which can mean different things to us.

It partially sounds like you've made up your mind about the amp. So just replace it. Gotta pay to play in this game. Otherwise you're left with modifying your system in the other ways that have been described.
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