fEarful 12/6

architect · 28th February 2009, 05:43 AM

On a bassguitar community we're wondering how to make a nice XO, passive or active. On this forum we miss the experience of speakerdesign like we have on DIYAUDIO. So I know only a little about passive and I started this thread.

bassguitar community
http://www.talkbass.com/forum/showth...=1#post7045784

cabinetdesign
fEarful 12/6
http://lowdownlowdown.com/greenboy/DL/

It is a two-way system, tweeter is not useful in our opinion
sub Eminence 3012LF 63liters bassreflex @ 35Hz
mid 18Sound 6ND410 3 liters closed box

My own experience

1. Linkwitz Orion, 2x Peerless 10", Seas W22 7", Seas Millenium
http://www.linkwitzlab.com/orion_challenge.htm
2. tangband fullrange
3. CSS FR125S fullrange
4. Eton Bluesmall Eton 550/8 and ER4
http://www.lautsprecherbau.de/
5. http://www.diyaudio.com/forums/showt...1&pagenumber=1 this project is still busy on redesigning the shape of the cabinet, my dad didn't like the shape.

architect · 28th February 2009, 05:49 AM

In Boxsim I modelled a passive crossover for the 12/6

18Sound 4ND410
3 liters

Eminence Kappalite 3012LF
63 liters reflexport @ 35Hz

Some kind of third-order highpass and lowpass plus notchfilter on both units. The mid has also got a zobelnetwork, which didn't seem to be very useful on the basswoofer.

Xmax check in Unibox seemed oke. At 450Watt between 45Hz and 70 Hz excursion exceeds Xmax 9,1mm with about 2mm. I think I can live with that.

Moondog55 · 28th February 2009, 06:01 AM

I'm asking just for interests sake; but how high in frequecy are the overtones on a standard bass guitar??

My daughter has on occasion used my party bass bin ( 2 * 15 plus 2* 12; 450litres tuned to 36Hz ) with her Yamaha jazz bass and her comment was always that the sound was not rich and deep enough and not loud enough to be heard over the drums

architect · 28th February 2009, 06:43 AM

There is a general consensus that we don't need a tweeter on a basscabinet.

It is a 12 inch plus a 6,5 inch mid which gives much better off-axis response and much faster fresh higher midtones.

Not to heavy please

The woofers are both neo-drivers which means less weight. The cabinet is well braced and made of 15mm plywood.

The 12 inch woofer is made for low frequencies and can do about 121dB from 60Hz and up with 500W of power.

picture
1. fEarful 12/6
2. fEarful 15/6
3. H&H combo Studio-60 Bass

Moondog55 · 28th February 2009, 07:27 AM

I thought that the bottom string on a 4 string bass was 38Hz, why would you build a box that can't reproduce the full range of the instrument??
If tuned to 60Hz you have lost almost a full octave, or do you mean that maximum output is at 60Hz?? but ported boxes have very steep roll-off below tuning and the driver becomes unloaded and power handling below tuning is much less.

architect · 2nd March 2009, 05:41 AM

As you can see in the graphics, F3 is more like 45 Hz and low E is about 41Hz I found out in Wikipedia.

When tuned at 30 Hz
F3 = 48Hz
F6 = 34Hz

And it seems most commercial basscabs don't even go this low.

What wattage should the resistors be?
And what wire should the coils be?

sreten · 2nd March 2009, 11:14 AM

Hi,

FWIW any sensibly portable bass cabinet concentrates on the
2nd harmonic of the fundamentals, which on a bass dominates
a "normal" rounded bass sound.

To make yourself heard raw midrange efficiency and SPL
capability matters more than anything else and this leads
to low Q (high midrange efficiency) bass alignments.
The bass amplifier needs bass knobs that work.

/sreten.

architect · 2nd March 2009, 06:11 PM

sreten
so what does this mean? you mean the crossover is not good?

28th February 2009, 06:01 AM	#3
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	I'm asking just for interests sake; but how high in frequecy are the overtones on a standard bass guitar?? My daughter has on occasion used my party bass bin ( 2 * 15 plus 2* 12; 450litres tuned to 36Hz ) with her Yamaha jazz bass and her comment was always that the sound was not rich and deep enough and not loud enough to be heard over the drums __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

28th February 2009, 07:27 AM	#5
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	I thought that the bottom string on a 4 string bass was 38Hz, why would you build a box that can't reproduce the full range of the instrument?? If tuned to 60Hz you have lost almost a full octave, or do you mean that maximum output is at 60Hz?? but ported boxes have very steep roll-off below tuning and the driver becomes unloaded and power handling below tuning is much less. __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

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2nd March 2009, 11:14 AM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, FWIW any sensibly portable bass cabinet concentrates on the 2nd harmonic of the fundamentals, which on a bass dominates a "normal" rounded bass sound. To make yourself heard raw midrange efficiency and SPL capability matters more than anything else and this leads to low Q (high midrange efficiency) bass alignments. The bass amplifier needs bass knobs that work. /sreten.

2nd March 2009, 06:11 PM	#8
architect diyAudio Member Join Date: Nov 2004 Location: Friesland	sreten so what does this mean? you mean the crossover is not good?

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