(2 x ) 20" T60: Hits the spot!

[ALAZDAK]

Running a lower but more shallow LPF on the Titans is an interesting idea. I may experiment with that when I get the chance.

My old crossover ran only 24dB/octave slopes, and the 4x12" towers I used for mains began to whine audibly when I dropped the lo-pass into the 60s or low 70s, so I stuck with the 80Hz filter.

I think I'll try harder slopes at the same frequency first, as I would prefer not to extend the range of frequencies over which my mains and subs overlap

[osse]

Running a lower but more shallow LPF on the Titans is an interesting idea. I may experiment with that when I get the chance.

My old crossover ran only 24dB/octave slopes, and the 4x12" towers I used for mains began to whine audibly when I dropped the lo-pass into the 60s or low 70s, so I stuck with the 80Hz filter.

I think I'll try harder slopes at the same frequency first, as I would prefer not to extend the range of frequencies over which my mains and subs overlap

I was/am at the same philosophy, but it actually sounds very good, even with a bit of overlapping sometimes...

There is nothing to loose by trying in any case. good luck with the quest!

[Gregory East]

Running a lower LPF is a very dangerous idea. There is no known voltage limit for lower frequencies on T60. If excursion rises rapidly below the normal cutoff you could easily blow them.

[Michael Ewald Hansen]

Running a lower LPF is a very dangerous idea. There is no known voltage limit for lower frequencies on T60. If excursion rises rapidly below the normal cutoff you could easily blow them.

Its not really dangerous running a lower LPF, however, setting the HPF lower than 25hz would be a silly thing to do..

[Gregory East]

DOH, didn't eat enough today! Yes, leave the HPF alone, alone I say! Excuse me while I go get some sleep. At least I'm funnier than Harley, sometimes, eh?

[osse]

with the D12LF the T30 has got a approx 12 dB increase between the 60-120 hz octave if it's 27" inches wide, which is rather ideal as the 12 dB/octave filter pretty much straightens out the curve to linear... I've got 27" wide with 3012LF and as far as I know the sensitivity and response should be rather similar, but the 3012lf can take more volts.

The T48 has more like a 10 dB increase between 47-94 dB octave according to the sensitivity chart in the main window, which is good enought for a 12 dB/octave filter too and will more or less straighten it out as well.

the thing is, the more cabs you add, the more they balance the EQ curve by themselves so if you have many cabs it would maybe be better with a 6 dB/octave filter... would be really cool to have two HPF filters to play with, one for response correction like 6-12 dB/oct @ 45-60 hz, and one for actual cutoff like 48dB @ 100 hz..

But non of this stuff is scientific or rules not meant to broke when out in the field... experiment and see what you like the most!

[Ryan A]

Lowering the low pass can smooth response. However, the problem is it reduces the output of the sub where it's most efficient, and effectively raises the output of the sub where it's least efficient. It's basically making the sub do more work and trying to make the box play more of the frequencies that it doesn't excel at making.

And, in the end, no amount of EQ tweaking will bring out the sub 40 hz that the OP was lacking in T48. T60 is better suited for recorded music, which we already knew all along.

[osse]

Lowering the low pass can smooth response. However, the problem is it reduces the output of the sub where it's most efficient, and effectively raises the output of the sub where it's least efficient. It's basically making the sub do more work and trying to make the box play more of the frequencies that it doesn't excel at making.

And, in the end, no amount of EQ tweaking will bring out the sub 40 hz that the OP was lacking in T48. T60 is better suited for recorded music, which we already knew all along.

-1, that's the kind of situation where you generally need to increase your cab number. actually by reducing the amount of work the sub has to do in the efficient areas leaves some more volts to reach maximum excursion in areas where it's not as effective - the reduction you make somewhere is an increase somewhere else, as you would save a couple of volts of excursion to other frequencies.

the box is not worse at playing those frequencys if the parameters are set right, you just have to dial the knobs accordingly...

What I think is the interesting discussion here is wether it was the (from what I can tell) increased sensitivity in the +60 hz region of the T48 that made him un-satisfied due to non compensating for sub 60 hz region with proper EQ/filter settings for the intend goal, or if it infact was the lower frequency and originally more linear curve of the T60 that made it the winner.. probably both

At least for me, T30's have very good extension(and I'm playing very bass heavy trance, techno and dubstep), T48's just a tad less...

[Ryan A]

No amount of additional cabs will help, and increasing output where the cab is least efficient is a recipe for disaster.

[osse]

I need to know if I understand this right, do you mean that the T48 is weak in the 40 hz register if a couple and the 35 hz register if quad stack?

[Ryan A]

Not weak, just not its forte. 20-30 hz however does fall into the weak category.

[subharmonic]

Not weak, just not its forte. 20-30 hz however does fall into the weak category.

I believe this to me accurate IMHO also. Just like my HGS-10 home theater sub could go to 20Hz it wasn't its area of power and a decent 12-15 could own it. Originally I thought horn. would compensate for this FC "issue" but in my experience seems to not be so.

On the other hand I have read reports on here of shorter horn paths having better SQ. Reports of SQ of a T18 better than a TT, TT better than THT, and T30 better than T60. T39 didn't sound better than a T60 IMHO although I did hear and agree with the THT/TT reports, for music anyway again IMHO.

[osse]

The T48 is fully capable of reaching desired SPL(depending on expectations and number of cabs) in it's whole passband, which is 40(or 35) to whichever freq you set your LPF on. All the power and excursion saved due to decreasing the increase in sensitivity at higher freq's is spread all over the passband, creating a more even and possibly better sound.

The T48 isn't even designed to go down to 20-30 hz so that are not taken into account.

My cabs is is not worse at playing or doesn't sound worse at lower frequencies within it's passband, depending on my DSP settings

[ALAZDAK]

Pictures! (links to pictures, anyway)

Dorm Room Setup.

2 of the 4 Jacks not included, more finishing/painting to be done:

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 2819_n.jpg

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 1702_n.jpg

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 6323_n.jpg

http://sphotos-b.xx.fbcdn.net/hphotos-s ... 5143_n.jpg

[Bas Gooiker]

Pictures! (links to pictures, anyway)

Dorm Room Setup.

2 of the 4 Jacks not included, more finishing/painting to be done:

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 2819_n.jpg

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 1702_n.jpg

http://sphotos-a.xx.fbcdn.net/hphotos-a ... 6323_n.jpg

http://sphotos-b.xx.fbcdn.net/hphotos-s ... 5143_n.jpg

Nice three way setup... What HF horns are you using ontop of the jacks?

How does the T60 sound inside that small room?