About to start a fEarful

[playerunk]

but this is all that this project has in common with the rest of the fearful projects..

i don't have the time and the money for the full cab/crossover build..BUT i have the money for the woofer kappalite 3012LF and a laney RB3 combo.going to buy the 6.5 driver and components down the way. and sometime this summer they will get a permanent home.

calculated the volume of the cab in the combo and with some modifications to the ports it could work.

now..assuming bbp6 is wrong..what can happen ? damage to the driver and/or blow the cab to bits ?

[playerunk]

bump

[Wes Whitmore]

Just wait...why hack up a good combo?

[mcapote]

1) if its not off the plans of the fEarful and the same parts it's not one.

2) you wont blow a cabinet apart the voice coil will smoke long before that could happen.

3) bass box pro 6 is very accurate, when building car bass cabinets, which is what is was designed for. never tried it on a bass cabinet where you are trying to flatten the response as opposed to hitting SPL peaks. Dont see it would be that far off from actuality if you are reading it correctly.

[playerunk]

Originally Posted by Wes Whitmore

Just wait...why hack up a good combo?

i don't have the time and money at the moment for the complete fearful build..so i will start with the speaker which will go in the combo that i have.
i will use the upgraded combo with my current head and hopefully i won't need the 410 as often (pain to transport)

Originally Posted by mcapote

3) bass box pro 6 is very accurate, when building car bass cabinets, which is what is was designed for. never tried it on a bass cabinet where you are trying to flatten the response as opposed to hitting SPL peaks. Dont see it would be that far off from actuality if you are reading it correctly.

i used winisd also and the graphs don't look like i would exceed xmax or others limits..but i was wondering if the cab would blow because i heared stories ..and since the combo wasn't designed for such a high power driver i could put a lot of stress on the joints.

[Wes Whitmore]

Your first statement made it sound like you were going to buy a 3012LF driver AND a Laney combo...but it sounds like you already have the combo now.
I just looked at a picture of the laney RB3 combo since i have never seen one before. It looks small. The baffle is set way back in there. At least take the driver out and measure the internal space. If it's made of partical board, I probably wouldn't touch it. It will work for the 65watt combo amp probably. That head isn't going to be enough wattage for that woofer. The 3012LF doesn't extend that high, and you will need that 6.5 from day one to fix the frequency hole. Then you will need to build a 3 way crossover. Then you will realize that you just don't have enough power to drive that 3012LF with that 65 watt head. You will have retune those 4 little ports in the laney, which will much up the baffle and take away even more airspace.
If you do all the math and it works out after the port mod, don't mind a hole in the midrange, and don't mind having a box that will probably be much quieter than the stock laney RB3, then go for it, but by the time you spent modifying all of it to get it to sound decent, you could have built the Earful, and still have a good Laney combo for smaller gigs/practice.
Wes

[mcapote]

Originally Posted by playerunk

i don't have the time and money at the moment for the complete fearful build..so i will start with the speaker which will go in the combo that i have.
i will use the upgraded combo with my current head and hopefully i won't need the 410 as often (pain to transport)



i used winisd also and the graphs don't look like i would exceed xmax or others limits..but i was wondering if the cab would blow because i heared stories ..and since the combo wasn't designed for such a high power driver i could put a lot of stress on the joints.

ive gotten 160dB (on a termlab meter) to the dash board in a CRX with a 3/4" MDF box put together with standard wood glue and it didnt blow apart so trust me you arent gonna blow your box apart. you wont come within 30 db of that box.

[playerunk]

Originally Posted by Wes Whitmore

Your first statement made it sound like you were going to buy a 3012LF driver AND a Laney combo...but it sounds like you already have the combo now.
I just looked at a picture of the laney RB3 combo since i have never seen one before. It looks small. The baffle is set way back in there. At least take the driver out and measure the internal space. If it's made of partical board, I probably wouldn't touch it. It will work for the 65watt combo amp probably. That head isn't going to be enough wattage for that woofer. The 3012LF doesn't extend that high, and you will need that 6.5 from day one to fix the frequency hole. Then you will need to build a 3 way crossover. Then you will realize that you just don't have enough power to drive that 3012LF with that 65 watt head. You will have retune those 4 little ports in the laney, which will much up the baffle and take away even more airspace.
If you do all the math and it works out after the port mod, don't mind a hole in the midrange, and don't mind having a box that will probably be much quieter than the stock laney RB3, then go for it, but by the time you spent modifying all of it to get it to sound decent, you could have built the Earful, and still have a good Laney combo for smaller gigs/practice.
Wes

my head is a peavey tour 450 (forgot to mention) ..and that's what i'll be using to drive the 3012
3way xover ?..no way..at first i'll be driving the woofer alone and i think it will sound better that the standard combo. this will work untill summer when i'll start on the fEarful with the 6.5

bassboxpro substracts from the internal airspace when you add ports and i measured the box and the thickness of the walls and did the simple math to get the internal volume (about 40l) and with the modified ports i get 35l..i know it's smallish to tiny but from what is see in bbp and winisd i'll still get better results than with the standard driver (better than with a delta 12lf and better than my 410 with legend bp's in it..modeled them too).

will take the driver out for additional observations

[Crockettnj]

Originally Posted by mcapote

ive gotten 160dB (on a termlab meter) to the dash board in a CRX with a 3/4" MDF box put together with standard wood glue and it didnt blow apart so trust me you arent gonna blow your box apart. you wont come within 30 db of that box.

And neither did you in an open room. Well, ok, that's an exaggeration.

Point is, in car measurements with peaky boxes benefit from a LOT of cabin gain. Unless he gigs in a Camry, a bass cab wont be so lucky.

Then again, your whole point is valid, the cab wont blow up.

So, yeah.