DA135-8 : just for kicks project questions

[jeff_free69]

Planning to pick up 4 (maybe 8) of these 5 1/4 woofs on special, for an unusual project.. it will be for an instrument practice amp, made to mimic the Hartke bass amps visually, which became famous for their aluminum drivers yeasr ago.

I'll be hitting it with a monstrous 2 x 40W @ 4 ohm (on a good day) Pyle mini amp http://www.partsexpress.com/pe/showd...number=248-462

Instruments will be keyboards and guitar and bass processed through Line6 PodXT's.

Looking at the posted pdf graphs, I think I can keep this at a living room friendly size and acheive the "QB3" vented design at 4 x .33 cu ft = 1.3 ; to give F3 = 46Hz.

PORT
Assuming I internally divide the cabinet down the middle, with 2 drivers in each side (~ .66 cuft) , what port size do I need? For a single/ .33 it says 1.5 D X 6.3L


NOTCH
Since its not a critical application I will run these full range and not worry too much about the ragged response. ( its gotta be smoother than the JBL guitar speaker i use now). But I can see the need for a little notch around 1.8kHz to keep it from getting too obnoxious. The 2 drivers will be wired in parallel, giving a nominal 4 ohms
- can you recommend a simple notch at 1.8 k for this ?

[envisionelec]

Re: DA135-8 : just for kicks project questions

I'll be hitting it with a monstrous 2 x 40W @ 4 ohm (on a good day) Pyle mini amp http://www.partsexpress.com/pe/showd...number=248-462

If there are never any good days, then that statement would be true.

[AJ]

Re: DA135-8 : just for kicks project questions

http://www.talkbass.com/forum/showthread.php?t=414959

http://www.talkbass.com/forum/showthread.php?t=420783

[rudyjakubin]

Re: DA135-8 : just for kicks project questions

WoW! Reminds me of the David Weems Sweet 16...
Well, I know one thing for sure - they got 'Bass'...

[nick29498141]

Re: DA135-8 : just for kicks project questions

If there are never any good days, then that statement would be true.

Hahahahah :D:D

[nick29498141]

Re: DA135-8 : just for kicks project questions

http://www.talkbass.com/forum/showthread.php?t=414959

http://www.talkbass.com/forum/showthread.php?t=420783

Cool links...

Bessel Arrays anyone??? :D

[Chris Roemer]

Re: DA135-8 : just for kicks project questions

Planning to pick up 4 (maybe 8) of these 5 1/4 woofs on special, for an unusual project.. it will be for an instrument practice amp, made to mimic the Hartke bass amps visually, which became famous for their aluminum drivers yeasr ago.

I'll be hitting it with a monstrous 2 x 40W @ 4 ohm (on a good day) Pyle mini amp http://www.partsexpress.com/pe/showd...number=248-462

Instruments will be keyboards and guitar and bass processed through Line6 PodXT's.

Looking at the posted pdf graphs, I think I can keep this at a living room friendly size and acheive the "QB3" vented design at 4 x .33 cu ft = 1.3 ; to give F3 = 46Hz.

PORT
Assuming I internally divide the cabinet down the middle, with 2 drivers in each side (~ .66 cuft) , what port size do I need? For a single/ .33 it says 1.5 D X 6.3L


NOTCH
Since its not a critical application I will run these full range and not worry too much about the ragged response. ( its gotta be smoother than the JBL guitar speaker i use now). But I can see the need for a little notch around 1.8kHz to keep it from getting too obnoxious. The 2 drivers will be wired in parallel, giving a nominal 4 ohms
- can you recommend a simple notch at 1.8 k for this ?

Each HALF side (driver pair) will want a 2"d x 4.5" long vent.
You can put all 4 in the same air space (about 1.4 cf) and just use a single vent, 3"d by 4.5" long. F3 should be 44 Hz. Max. excursion limited output should yield 105dB/m (-3dB @ 41 Hz) with 30 watts input.

[jeff_free69]

Re: DA135-8 : just for kicks project questions

Thanks ! - that's a great link about the Phil Jones knock off. This is in the back of mind as something that might eventually replace my current live rig (JBL 18" in 6 cu ft + 12" w/ horn tweeter on top - I play bass and keys).

Of course Phil Jones must use tougher more, efficient drivers, so I'd need to ease into that commitment. But then again mlwarriner's "coroner" plays an extremely aggressive style of music, presumably with everything at "11". So I guess it held up at least for the first few gigs.

** He didn't bother with any notch filters,
anybody have a suggestion for that 1.8Khz peak ? **

The Sweet16 array photo reminds me of another potential project, to build a BOSE PAS inspired knockoff (this is the one that uses about 100 2" drivers in a 6 ft high stick + a 2x6.5" sub)

[AJ]

Re: DA135-8 : just for kicks project questions

I would use the 7" DA175 woofer personally. More power handling. For bass guitar you won't want an F3 below 50hz or so, as i think it ends up sounding like mud, and you lose power handling. You'll want to experiment with different tunings. Don't bother with passive filters. Keep everything active so its easily adjustable.

Most drivers people use for instruments have worse responce than the DA drivers so i wouldn't worry much about response irregularities. Adjust with an EQ to taste.

[jeff_free69]

Re: DA135-8 : just for kicks project questions

My gut feeling is also that the 7" is really better suited for this. but then that would need a much bigger cabinet (.75 cuft/driver). Since it has better power handling you can then get away with less drivers. but in phase 1 I'm looking for a little visual wow factor from the large number of drivers on a small baffle, so yesterday I bought 4 Da135s for $50 to play with.

My mackie mixer has only Bass and treble EQ, so cranking the bass will have to do instead of cutting at 1.8K without the notch, should be fine.

[brianp]

Re: DA135-8 : just for kicks project questions

For bass guitar you won't want an F3 below 50hz or so, as i think it ends up sounding like mud, and you lose power handling.

Well . . . the low E of a standard bass is 39Hz. A five-string bass goes down to the B below that, which is around 30Hz. Seems like you'd need the extension, if you want to hit those fundamentals and not just their overtones.

[AJ]

Re: DA135-8 : just for kicks project questions

Depends on the music style. For funk, yeah, you'll want all the low end and midbass bump you can get. For rock/metal more people focus on the midrange/midbass.