basically im designing a box for my peerless 830515 12inch xls subwoofer. ive played around with it for a few days and have come up with a 105ltr box. 4inch dia x 18long port tuned to almost 20hz. mdf thickness 3/4inch. ive attached some pics and just want to know if the response i have is good or could be improved. my desired 'frequencies' is from 20hz to 120hz. just to take note this subwoofer is for "HOME USE". ok i think ive given enough info. if you need anymore just reply to my post. 🙂 hopefully im on the right track. anyways... CHEERS.
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I avoid bumps like you have on the bottom*. Too low a tuning or too big a box IMHO.
* i avoid roll-offs in the bass where the 1st derivative of the curve passes thru zero more than once.
dave
* i avoid roll-offs in the bass where the 1st derivative of the curve passes thru zero more than once.
dave
That "shelving" effect you see is because of too low tuning. Try a smaller enclosure or shorter port. The shelf is not bad if you can keep it no more than 3db down which still means higher tuning.
What is the intended purpose of the sub? If mainly for music, it is pointless to tune it so low. A mid 30s tuning is much better. Also check how it works sealed. If the F6 point looks decent, sealed may be the way to go.
What is the intended purpose of the sub? If mainly for music, it is pointless to tune it so low. A mid 30s tuning is much better. Also check how it works sealed. If the F6 point looks decent, sealed may be the way to go.
I happen to think that the alignment shown would be rather good. Remember that room gain will help to bring the lower frequencies in line - a 6dB descrepancy from 20Hz to 80Hz isn't so bad, but I certainly wouldn't use such a system outdoors.
A smaller cabinet tuned higher up will give a flatter simulated response, but it'd be difficult to predict how it would perform in a given room - a large test box would allow you to change the volume and port tunings until you find something you like, at the expense of building 2 cabinets instead of 1.
Chris
A smaller cabinet tuned higher up will give a flatter simulated response, but it'd be difficult to predict how it would perform in a given room - a large test box would allow you to change the volume and port tunings until you find something you like, at the expense of building 2 cabinets instead of 1.
Chris
Interesting driver. Quite unusual parameters for a car sub. You should be able to do much better.
"Optimal" ported v.s. sealed...
EBS v.s. sealed...
Seams like any of these should provide decent performance. I would be inclined to go with the EBS tuning but you could go sealed with EQ. Given decent Xmax either should be OK. Probably need to be careful with heavy organ though. 😉
"Optimal" ported v.s. sealed...
EBS v.s. sealed...
Seams like any of these should provide decent performance. I would be inclined to go with the EBS tuning but you could go sealed with EQ. Given decent Xmax either should be OK. Probably need to be careful with heavy organ though. 😉
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so what shall i do guys? keep the build the box as i said and tune it higher to get a flatter response? or change the box completely? or would someone please download winisd and build a box if this driver were urs. also this sub will be 70% movies 30% music.
I just came up with about the same as mashaffer 56l tuned to 28hz is about as low as that driver will go. It's a car driver...
Firstly, change the inductance in the driver parameters because WinISD exaggerates the effect. Set it to zero.
Next make the box a bit smaller and bring the tuning up. What you actually need is also related to your room transfer function, which we don't know. In fact, for some rooms, your initial design might be just fine.
Next make the box a bit smaller and bring the tuning up. What you actually need is also related to your room transfer function, which we don't know. In fact, for some rooms, your initial design might be just fine.
ok i got some Questions.
can i tune my sub lower then its fs?
is that FS based in a car environment?
if i were to use it for home use could i tune it lower then its rated FS?
since this is a brand new sub, after the spider loosens would the fs be lower?
CAN I DO 20hz with this subwoofer?'
i know its alot of Q'z but they have to be asked as im learning and need answers. lol. anyways hopefully i get good feedback.
many thanks mitch.
can i tune my sub lower then its fs?
is that FS based in a car environment?
if i were to use it for home use could i tune it lower then its rated FS?
since this is a brand new sub, after the spider loosens would the fs be lower?
CAN I DO 20hz with this subwoofer?'
i know its alot of Q'z but they have to be asked as im learning and need answers. lol. anyways hopefully i get good feedback.
many thanks mitch.
Yes but not recommended.
No, it's the free air resonance.
Yes but at expense of SPL
Yes, only a little bit. (If the coil gets warmer too.)
All woofers can get to 20hz but again, at expense of SPL, sometimes a lot of SPL! I think it's a bit too much to ask from this woofer.
Hi, You can tune below 20 but you need an appropriate HPF to protect the driver from over-excursions..A T-TQWT can easily do 20Hz placed at a wall near a room corner.
b🙂
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hmmm, so should i tune it to its rated fs which is 28.20hz and try and get the flattest response?
You have to be careful... the modeler usually does not account for room gain (given how variable it is room-room). If you model flat to a low frequency, you will likely have non-flat response as it will bump up with room gain.
dave
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