Getting Subs To Hit All Notes From 20hz+

[07sOnAtA sp.ed]

Hey, guys i have a couple questions

My 1st question is, is there a way to get your sub(s) to play all if not most of the notes from 20hz up? Im talking about if there's a full system, (HU, Inter-spkr amp, Sub amp, n sub(s)) is there any specific way to do this?

2nd question is, if a sub box is tuned to 32hz, what frequencies will the box play really well, pretty well, and not good at all? Also how does setting the low pass on the sub amp affect this? What would be the differences if i set the low pass to 20 or to 35?

Thanks in advance guys!

-Kandu

[ptcary]

I am guessing you want a flat frequecy response form 20hz up to your crossover point 80hz?

The ability of a sub to play all those frequencies well is a tuning issue more than a capability issue.

I think most ported boxes peak at about 5 hz higher than their tune. And drop off below the tuning hz. mine is a 38 hz tune, and seems to peak in the low 40's.

I am sure some of the experts will chime in here with better answers for you.

[infkt]

If im interpreting it right your asking how to hit 20hz+, My box is tuned to 24ish hz and it hits from 20hz+

[07sOnAtA sp.ed]

I am guessing you want a flat frequecy response form 20hz up to your crossover point 80hz?

The ability of a sub to play all those frequencies well is a tuning issue more than a capability issue.

I think most ported boxes peak at about 5 hz higher than their tune. And drop off below the tuning hz. mine is a 38 hz tune, and seems to peak in the low 40's.

I am sure some of the experts will chime in here with better answers for you.

yeah, I am looking for a flat response but it more from a 28hz+ to 80hz if that's possible. if that's the case that ported boxes peak about 5hz higher then their tuning frequency, should i go w/ a sealed box?

[07sOnAtA sp.ed]

If im interpreting it right your asking how to hit 20hz+, My box is tuned to 24ish hz and it hits from 20hz+

What kind of sub are you running, and in what kind of enclosure. That sounds ridiculous; that's is basically what im looking for. does it hit well on the higher notes?

[uhoh_45]

a 4rth order bandpass?

[07sOnAtA sp.ed]

a 4rth order bandpass?

Can you explain, or post a link please?

[infkt]

Its a DD9515 in a 3cuft box with 3 4in ports, the lows are powerful and the highs are good, i don't know how high i can go since my LPF is set at 50. The box will be rebuilt soon but it will still get 25hz tuned. ive had 43, 35, 32, and then i used 25 and like it the most. i seen you said from 28hz+ above, with 25 it hits well, all the slowed songs i play are great.

Edited January 9, 2009 by infkt

[fearof85]

A 6th order series tuned bandpass. Search.

Drew

[Boon]

Its a DD9515 in a 3cuft box with 3 4in ports, the lows are powerful and the highs are good, i don't know how high i can go since my LPF is set at 50. The box will be rebuilt soon but it will still get 25hz tuned. ive had 43, 35, 32, and then i used 25 and like it the most. i seen you said from 28hz+ above, with 25 it hits well, all the slowed songs i play are great.

I don't believe it will hit the highs as well as say, a DDBox (40hz, 16" port)

I've had my 9515 in boxes tuned from 29hz through to 62hz.

In the 29hz box yes, it was very musical and could 'play' any note but the output was about 6db (!!!) down on what it played when tuned to ~40hz. Tuning higher than that I only gained more of a spike at a particular note.

IMO around 28hz is the lowest you'll ever need to play (unless you play a lot of C&S) and below that I reckon you're just risking damaging your woofers.

In car response tends to extend at least a few hz below tuned frequency (especially if you load the woofers and port against something) which is why I can't ever see a need to tune below about 32hz unless you're going for ultra SQ or competing in the UK PD format.