Topic: Up Front Sub Bass - How is it attained?

[Master D]

Posted by: wengweng 
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Quote from: Master D on October 06, 2006, 11:26:56 AM
Hi All,

One of the main things in my system is a lack of good sub blending with the mids and ultimately well defined up front sub bass. What I have done is a lot of tuning in terms of slopes and x.over points with the aid of TA. I know some equipment blend better than others, but is there a general guide on this topic?

I am using an Alpine 9835, should I be messing with the bass focus function ? I'm kinda stumped, so any feedback would be good!   Thanks!

Also try different setting on the gain for both the mid and sub besides the xover points. Use Song/music you are familiar with would help also. Start with a fixed setting on the mid, then blend the sub into the midbass. IMHO, good amp will make tuning easier, but that's purely opinion .

I tried alpine bass focus function before, but with no good results. Its basically a time alignment function ? I rather separately time align the sub with other drivers

wengweng,

Good point on the gains, I have yet to try that, will do so soon, thank you!

Yeah bass focus is a Time Alignment function, I'm a tad sceptical too cos I finally did my TA to my satisfaction and I'm worried of messing it up if I go on to use the bass focus fucntion. Well anything thats messed up can be easily rectified by just keying in the current TA settings...so...yeah, I just contradicted myself :-X ::) ??? ;D, will give Bass Focus a try when I have a couple of hours to kill.

Thanks!

[Master D]

Posted by: mnkh27 
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All good points here. My understanding in getting bass up-front is first and foremost the fundamentals. Before working on the crossover points, TA and EQs and processors, I would make sure the following is solved:

1) Good mounting of your midbass drivers, so that you'll get good midbass that will help pull your subbass further front.

2) Sufficient power to your midbass and like what wengweng pointed out, a good amplifier for the subs too. Clean power and headroom is what we're seeking. Not so much of power ratings.

3) Solve all rattling problems from the rear, including C-pillars and rear parcel shelf.

4) Make sure you open a hole somewhere at the rear shelves to allow the bass to get into the cabin.

5) Make sure that bloody subwoofer enclosure is not leaking. If not you'll be more prone to getting mechanical noises from the subwoofer driver.

and finally,

6) If you can afford it, a good and fast sub that can keep up with the front mids.
 

Hi  Mike,

I've got all 5 points you listed solved,  :D just not too sure if my IDQ15 is too slow for my mids yet, I think (for now at least) its not... :-\

[fooyc]

 ;D Must listen in real loh..

[Newton]

Hi Newton,

What do you mean by variable phase shift? Yeah I've been "trial and erroring" for the past 9 months...lol....I've made incremental improvements, just looking for more...hehe!

Usually phase shift for amp is either 0' or 180' (You either set it to 0' or you set it to 180', you can't choose anything in between)
In the other hand, if you amp got varible phase shift - You can slowly turn the knob from 0' - 180' and stop at the point where you feel that the bass is upfront...=) Of course this is just one of the option... ;)

[Master D]

Thanks for the clarification Newton, I've been flipping the phase many times... ;D

[netken]

stupid reply from me, change to SW 300 ... problem solved .. kekeke...  ;D :D :o

[chyanne]

hmmm.... i learn somethin real great today..... ;D

[Marquis]

stupid reply from me, change to SW 300 ... problem solved .. kekeke...  ;D :D :o

wah..... good idea !

or u can get a 9" sub n place it nex to the driver sit.  :o

[Master D]

Hahaha....put it next to the driver seat ehhh.... ;D

Netken,

UFB (Up Front Bass) should not be equipment specific...rite...I would think the best drivers just help to aid in attaining UFB, but all drivers should have the potential.

[GRexer]

Let me know when you are back here la... i bring the IDQ12 drop in see if the sub-bass gets any "faster' :D

[Master D]

Will do bro.  ;D

[GRexer]

Or if you want to try out "other" subs, can also, as long as it arrives here in time, it's still stuck in US thanks to the new ruling about shipping magnetic stuffs. Argh! :'( ??? >:(

[Master D]

you know...I am eagerly awaiting your other sub...what is the ETA?

[GRexer]

As of now, there's no ETA :( Unless i take the "slow" mail that takes at least a month or two to reach  ??? :o Still trying to arrange to get a "faster" and cheaper alternative, USPS sucks!(coz they don't wanna ship my unit due to magnetic interferance) So does UPS(for charging so high :D) Now left with Eng's alternative which probably have to go thru someone "famous" around the ICE scene in Malaysia, which i'm still not too keen about, but if it cuts time and also cost, i guess i'll have to close my left eye then. :-X

[netken]

wat new rule about shipping magnetic stuff??