hi quasi 🙂 .. & welcome back 😉 & thnx a lot for testing ...
i have a five string bass , & my lower string has a 31 hz freq ...
so u think i should build a biger box ???? 🙁 ...
or the 24"*24"18 cubic box is enough & good ? 🙂
simon said that the 24"24"18" box w a 4"12" pipe is ok for me .. i donno anythin bout the winisd .. so what do u think simon & quasi .. 🙁 what should i do ?
i have a five string bass , & my lower string has a 31 hz freq ...
so u think i should build a biger box ???? 🙁 ...
or the 24"*24"18 cubic box is enough & good ? 🙂
simon said that the 24"24"18" box w a 4"12" pipe is ok for me .. i donno anythin bout the winisd .. so what do u think simon & quasi .. 🙁 what should i do ?
31 Hz
According to WinISD for a flat response down to 30 Hz the following applies.
A ported box with an internal volume of 65 ltrs
A vent that has an internal diameter of 82 mm and is 268mm long.
You will need to experiment a little with the port to get it just right especially if you can't get pipe exactly 82mm wide.
Cheers
According to WinISD for a flat response down to 30 Hz the following applies.
A ported box with an internal volume of 65 ltrs
A vent that has an internal diameter of 82 mm and is 268mm long.
You will need to experiment a little with the port to get it just right especially if you can't get pipe exactly 82mm wide.
Cheers
Attachments
is my cubic box ok ? 🙁(
hi quasi ...
so should i build a 24"*24"*18" box ??? or i should double the size ? 🙁 ....
and i should use a 3.5" * 11.5 " pipe .. yeha ???
i m gettin little confused 😛 ...
hi quasi ...
so should i build a 24"*24"*18" box ??? or i should double the size ? 🙁 ....
and i should use a 3.5" * 11.5 " pipe .. yeha ???
i m gettin little confused 😛 ...
Imperial or Metric?
What do you normally use over there? Feet & Inches or millimetres?
How thick is the wood you are using?
Cheers
What do you normally use over there? Feet & Inches or millimetres?
How thick is the wood you are using?
Cheers
hi quaaaaaasssiiiii 🙂
we use millimetres 🙂 ...
& i wanna use a 18 mm mdf ( or 20 mm if i find )
😉
we use millimetres 🙂 ...
& i wanna use a 18 mm mdf ( or 20 mm if i find )
😉
hi guyz again .. & onething else 😛 ...
what if i add a 12" woofer w built in tweeter in this box w seprated amp for mid and high freq ???
plzzz help me ,
at first i decided two build two cabinets ,, one for subwoofer & one for higher freq ...
but now it ll become tooooooo big ...
& what bout if i build a bigger box and put them together ? ...( a box around 32"*32"*20" )
will u plzzzzzzzzzzz help me 🙁 ...
what if i add a 12" woofer w built in tweeter in this box w seprated amp for mid and high freq ???
plzzz help me ,
at first i decided two build two cabinets ,, one for subwoofer & one for higher freq ...
but now it ll become tooooooo big ...
& what bout if i build a bigger box and put them together ? ...( a box around 32"*32"*20" )
will u plzzzzzzzzzzz help me 🙁 ...
hi again again & again 😛
i just sent a post for help on constructin a psu without a transformer on solid state section ...
u guys have any idea ? 🙂
..... 😀 it seemz my questions will never end till every body run away from me !!!! lol ......
i just sent a post for help on constructin a psu without a transformer on solid state section ...
u guys have any idea ? 🙂
..... 😀 it seemz my questions will never end till every body run away from me !!!! lol ......
Ok...lets see;
If you want to put all that stuff in then build a very big box.
The picture shows what your response will look like and gives enough detail to build it.
Never built a power supply without a transformer. This provides the isolation needed to keep you alive if something goes wrong
Good Luck
If you want to put all that stuff in then build a very big box.
The picture shows what your response will look like and gives enough detail to build it.
Never built a power supply without a transformer. This provides the isolation needed to keep you alive if something goes wrong
Good Luck
Attachments
Hi, sorry I was away for the weekend.
Yes, your test box is probably too small so the 100 Hz band is boosted way too much.
Your idea to add a 12" woofer with integrated tweeter is not a bad idea, but you'll need to add a passive crossover network.
I'm sure that two woofers in your 24" x 24" x 18" box will sound great with a 4" diameter pipe. I would use a 12" pipe if you plan to play more inside, and 8" pipe if you plan to play more outside.
If you still want to add that 12" woofer, I would add it on the top of the box but keep it separated from the rest of the box with a layer of MDF. I would also angle it maybe 15-30 degrees to point at the listener.
Here is the simulated design of your box (with 8" pipe in red and 12" pipe in yellow) with bracing inside (I strongly recommend you to add bracing in your box).
Yes, your test box is probably too small so the 100 Hz band is boosted way too much.
Your idea to add a 12" woofer with integrated tweeter is not a bad idea, but you'll need to add a passive crossover network.
I'm sure that two woofers in your 24" x 24" x 18" box will sound great with a 4" diameter pipe. I would use a 12" pipe if you plan to play more inside, and 8" pipe if you plan to play more outside.
If you still want to add that 12" woofer, I would add it on the top of the box but keep it separated from the rest of the box with a layer of MDF. I would also angle it maybe 15-30 degrees to point at the listener.
Here is the simulated design of your box (with 8" pipe in red and 12" pipe in yellow) with bracing inside (I strongly recommend you to add bracing in your box).
Attachments
Here is to show you the difference between your test box with a 2" diameter pipe of 1" long versus the box you want to build.
I used your 25W opamp versus 300W for the box you want to build (150W per subwoofer) and I used the outside configuration so 8" long pipe.
You can see why the sound is so bad and why it's only loud around 100 Hz.
Remember that the frequency response over 300 Hz is not accurate, it's just to give you a general idea why your test box is not perfect.
I used your 25W opamp versus 300W for the box you want to build (150W per subwoofer) and I used the outside configuration so 8" long pipe.
You can see why the sound is so bad and why it's only loud around 100 Hz.
Remember that the frequency response over 300 Hz is not accurate, it's just to give you a general idea why your test box is not perfect.
Attachments
hi simon5 , & well come back 😉
as u see , i think it s may be better if i use a woofer w internal tweeter w this cabinet ...quasi told me to build a 44"*24"*18"
box w a 3" diameter pipe & 6" lenght ... so u think i should use a 4"diameter w 12"-8" lenght w this 44*24*18" box ????
and u think i should seprate the woofer & sub woofers sections ... so i think if i do that we should calculate everything again ... yeah ?
here is a desgin again ... plz help me w sizes ...
and one thing else .. should i add a pipe for woofer section ??? or leave it sealed ???
as u see , i think it s may be better if i use a woofer w internal tweeter w this cabinet ...quasi told me to build a 44"*24"*18"
box w a 3" diameter pipe & 6" lenght ... so u think i should use a 4"diameter w 12"-8" lenght w this 44*24*18" box ????
and u think i should seprate the woofer & sub woofers sections ... so i think if i do that we should calculate everything again ... yeah ?
here is a desgin again ... plz help me w sizes ...
and one thing else .. should i add a pipe for woofer section ??? or leave it sealed ???
Attachments
hi again 😛
what is bracing ??? .. u mean i should build my box so strong ???
have any idea , schematic , pcb for that plzzzzzzzzzzzzzzzzz ??? 🙁
😛 .. may be my question seems silly , but it s cuz of my english 😛 ...
what is bracing ??? .. u mean i should build my box so strong ???
hi again again again !
lol .. i tried to seal the pipe in my test box 🙂 .. and WOWWWW the sound is great if i want to compare it w the first try 🙂
thank u so much guys 😉 ...
but in 60 - 80 hz my box is shakin vey much , i think it s cuz of the box s not strong enough 🙂
i wont believe the sound changed that too much ...wow tnx a lot all 😉 i m gettin hopeful 🙂
help me build my main box 🙂
lol .. i tried to seal the pipe in my test box 🙂 .. and WOWWWW the sound is great if i want to compare it w the first try 🙂
thank u so much guys 😉 ...
but in 60 - 80 hz my box is shakin vey much , i think it s cuz of the box s not strong enough 🙂
i wont believe the sound changed that too much ...wow tnx a lot all 😉 i m gettin hopeful 🙂
help me build my main box 🙂
Hi, yes you should keep the woofer with a tweeter part sealed. No pipe for this part.
I would keep the 4" diameter by 12" long pipe for the main part if you play more outside or 8" long if you play more inside.
You could build the main part first and if you're not satisfied, you could add the woofer + tweeter part. You can also build them both at once. I can try to help you with the passive crossover, but I don't have any frequency response curves of the woofers you are using so I don't know where we should make the crossover frequency.
Bracing is MDF with holes that you put inside the box to make it stronger. With holes, the air can move in the box.
Here is an example for the angled front end with dimensions and an example of bracing. I'm not as good as you with drawing software hehe!
I would keep the 4" diameter by 12" long pipe for the main part if you play more outside or 8" long if you play more inside.
You could build the main part first and if you're not satisfied, you could add the woofer + tweeter part. You can also build them both at once. I can try to help you with the passive crossover, but I don't have any frequency response curves of the woofers you are using so I don't know where we should make the crossover frequency.
Bracing is MDF with holes that you put inside the box to make it stronger. With holes, the air can move in the box.
Here is an example for the angled front end with dimensions and an example of bracing. I'm not as good as you with drawing software hehe!
Attachments
hi simon5 ... & thnx a lot ...
thank u for explainin bracin 😉 .. i ll do as u say 😉 ...
so i ll send u another design w the parameters u gave me 😉 ... i don want to give an angel to the woofer/tweeter section , cuz if i want to use it on stage , it will be on top of the stage , and the listener are at the bottom of stage , so the angel should be down ( i donno if i can explain my mind good in english 😛 ) ...
and for crossover i just saw some second hand speaker i donno anythin bout the parameters of them , if i want buy a one i ll inform u 😉 .. but totaly i wanna use sub woofers for 30hz to 500hz ( or maybe 1000hz .. i donno ,, what do u think ? . can the subs respond well in 1000hz ? ) and use the woofer/tweeter for above 500hz ,, ( till 10khz or 15khz ) ...
BUTTTT ....
there s a very big problem :-< ... the project maybe stop :-< ...
i couldn t find any transistors for amp ... i m still searchin for an amp ... all high power amps , use high power transistors , and i cant find them here ... :-< ... i donno what to do ...
i have to build this amp , but ,, it seems all the doors are closed to me 😛
thnx all for help ... i donno if i can finish this project cuz of amps ... anyway thank u so much all , i learned too much from u men 😉 ...
and special thnx to simon5 & quasi for helpin me a lot ... 🙁 ...
i m so grateful to u , i donno how should i thank u ...
do u have any idea for amp ????
( where is quasi ? )
i ll send u my design ...
thank u for explainin bracin 😉 .. i ll do as u say 😉 ...
so i ll send u another design w the parameters u gave me 😉 ... i don want to give an angel to the woofer/tweeter section , cuz if i want to use it on stage , it will be on top of the stage , and the listener are at the bottom of stage , so the angel should be down ( i donno if i can explain my mind good in english 😛 ) ...
and for crossover i just saw some second hand speaker i donno anythin bout the parameters of them , if i want buy a one i ll inform u 😉 .. but totaly i wanna use sub woofers for 30hz to 500hz ( or maybe 1000hz .. i donno ,, what do u think ? . can the subs respond well in 1000hz ? ) and use the woofer/tweeter for above 500hz ,, ( till 10khz or 15khz ) ...
BUTTTT ....
there s a very big problem :-< ... the project maybe stop :-< ...
i couldn t find any transistors for amp ... i m still searchin for an amp ... all high power amps , use high power transistors , and i cant find them here ... :-< ... i donno what to do ...
i have to build this amp , but ,, it seems all the doors are closed to me 😛 thnx all for help ... i donno if i can finish this project cuz of amps ... anyway thank u so much all , i learned too much from u men 😉 ...
and special thnx to simon5 & quasi for helpin me a lot ... 🙁 ...
i m so grateful to u , i donno how should i thank u ...
do u have any idea for amp ????
( where is quasi ? )
i ll send u my design ...
Well lower the frequency is, better it is, but for your application, maybe it's better to cover most of the frequencies with your subwoofers, since a bass guitar is hard on drivers.
As you said, use a design with no angles then, it will still be great sounding, and stronger. You could use some polyfill lightly packed in the woofer + tweeter separate section.
As you said, use a design with no angles then, it will still be great sounding, and stronger. You could use some polyfill lightly packed in the woofer + tweeter separate section.
It's a material that when in a box, the woofer thinks the box is bigger than it really is. It's also lower the sound level a little bit but usually the sound quality is better when you use polyfill.
It's looking like that:
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=260-330
It's looking like that:
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=260-330
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