as you may remember i had some problems fitting anything in my small 84 mazda b2000 but i have decided to sacrifice leg room for sound. i built a box for a single mtx rt10 10" sub. the box and sub fit in good but now i need some info on whether to port the box, and what kind of amp i will need. any info would be great.
Replies (11)
swez on 05/4/2004 14:24:34
What are the external dimensions of the enclosure used here? H", W" & D". With that, can roughly calcualate the internal air space for you to determine if you can port or not.
Also, is this the single coil, 4 ohm version or the Dual coil 4+4 ohm version? Road Thunder 10" sub right?
Hummm, am getting details from MTX technical. They have a live chat format so I should have this info for you later today.
Swez
swez on 05/4/2004 17:41:02
OK, I got the details on your 10" MTX Road Thunder.
Sealed: 0.65 cf min; 0.95 cf max. (0.80 is best SQ)
Vented: 1.0 min; 1.50 cf max. (1.25 is best SQ, 3" x 10.5" port)
Sub rated at 200 watts and tuned port frequency is 39 Hz.
Now, all we need from you, is the # of voice coils on this model and the external dimensions of the box.
Swez
Tinker18 on 05/4/2004 19:38:54
if you port the box you will need an amp with a subsonic filter to keep it from going below the tuned port frquency, this is, assuming the box you built has the dimensions ot be ported.
oldmazda on 05/4/2004 20:45:38
height is 14" width is 18" and the depth it 5.5" at the top and 7.5 at the bottom. its a slanted box so that it would fit behind my bench seat. i don't own the sub right now but i made sure that it fit by building it off of the dimensions of my freinds mtx 10" sub.
Tinker18 on 05/4/2004 21:33:52
3/4 inch mdf board?if so then 12.5x16.5x6.5(5.5+7.5=13/2=6.5)=0.78 cubic foot which is almost perfect according to swez's calcs for the best SQ.
oldmazda on 05/4/2004 23:06:31
actually i used 5/8" because the sub that would be put in this enclosure will only put out 200 watts. this shouldn't make that much difference to the volume of the box though, so then i don't need to port or anything? also is it alrite to seal the box with regular all purpose silicone or do i need something special. they should already be sealed from the glue i used but as a just in case or something?
swez on 05/5/2004 07:19:00
Seal the seams with water clean up silicone if you wish. Just wait overnight for the material to cure, then install the sub.
That box is right on the money for a good SQL, sealed enclosure. You'll get good midbass and satisfactory lows from this enclosure.
Finally, the amp you choose, will depend on which model you choose. The 4+4 DVC is best fitted with a Class D MONO amp w/ ~200 watts RMS @ 2 ohms. If you go with the 4 ohm model, a 2 channel amp bridged, will give best output at 4 ohms.
Swez
cplkittle on 05/5/2004 08:18:29
Although I try my best to sitck to recommended enclosure sizes, don't give yourself a headache over .1 cu ft. on a sealed box. If the speaker recommendation is .746, somewhere between .6 and .9 will do fine.. I would almost bet that the average human ear would not be able to tell a difference between these two. Use polyfill experimentally until the best sound is achieved.
The biggest secret and or hint anyone can give you is to take your time.
swez on 05/5/2004 10:01:39
Amen to that one.... take your time!
Swez
Tinker18 on 05/5/2004 15:18:21
12.8x16.8x5.3 using 5/8 inch board, my calcs were wrong earlier in that i forgot to subtract the wood width from the depth calcs, so my internal was wrong, but with 5/8 inch board the internal volume is......0.65 cubic feet. im pretty sure, but someone double check my math.
swez on 05/5/2004 19:05:40
Close enough as I got almost 0.67 cf. A bit small for best low end bass, but if you stuff with ~3/4 lb of polyfill, that will get you closer to 0.70... good enough.
Now, what amp and which voice coil version is it gonna be?
Swez
Replies (11)
swez on 05/4/2004 14:24:34
What are the external dimensions of the enclosure used here? H", W" & D". With that, can roughly calcualate the internal air space for you to determine if you can port or not.
Also, is this the single coil, 4 ohm version or the Dual coil 4+4 ohm version? Road Thunder 10" sub right?
Hummm, am getting details from MTX technical. They have a live chat format so I should have this info for you later today.
Swez
swez on 05/4/2004 17:41:02
OK, I got the details on your 10" MTX Road Thunder.
Sealed: 0.65 cf min; 0.95 cf max. (0.80 is best SQ)
Vented: 1.0 min; 1.50 cf max. (1.25 is best SQ, 3" x 10.5" port)
Sub rated at 200 watts and tuned port frequency is 39 Hz.
Now, all we need from you, is the # of voice coils on this model and the external dimensions of the box.
Swez
Tinker18 on 05/4/2004 19:38:54
if you port the box you will need an amp with a subsonic filter to keep it from going below the tuned port frquency, this is, assuming the box you built has the dimensions ot be ported.
oldmazda on 05/4/2004 20:45:38
height is 14" width is 18" and the depth it 5.5" at the top and 7.5 at the bottom. its a slanted box so that it would fit behind my bench seat. i don't own the sub right now but i made sure that it fit by building it off of the dimensions of my freinds mtx 10" sub.
Tinker18 on 05/4/2004 21:33:52
3/4 inch mdf board?if so then 12.5x16.5x6.5(5.5+7.5=13/2=6.5)=0.78 cubic foot which is almost perfect according to swez's calcs for the best SQ.
oldmazda on 05/4/2004 23:06:31
actually i used 5/8" because the sub that would be put in this enclosure will only put out 200 watts. this shouldn't make that much difference to the volume of the box though, so then i don't need to port or anything? also is it alrite to seal the box with regular all purpose silicone or do i need something special. they should already be sealed from the glue i used but as a just in case or something?
swez on 05/5/2004 07:19:00
Seal the seams with water clean up silicone if you wish. Just wait overnight for the material to cure, then install the sub.
That box is right on the money for a good SQL, sealed enclosure. You'll get good midbass and satisfactory lows from this enclosure.
Finally, the amp you choose, will depend on which model you choose. The 4+4 DVC is best fitted with a Class D MONO amp w/ ~200 watts RMS @ 2 ohms. If you go with the 4 ohm model, a 2 channel amp bridged, will give best output at 4 ohms.
Swez
cplkittle on 05/5/2004 08:18:29
Although I try my best to sitck to recommended enclosure sizes, don't give yourself a headache over .1 cu ft. on a sealed box. If the speaker recommendation is .746, somewhere between .6 and .9 will do fine.. I would almost bet that the average human ear would not be able to tell a difference between these two. Use polyfill experimentally until the best sound is achieved.
The biggest secret and or hint anyone can give you is to take your time.
swez on 05/5/2004 10:01:39
Amen to that one.... take your time!
Swez
Tinker18 on 05/5/2004 15:18:21
12.8x16.8x5.3 using 5/8 inch board, my calcs were wrong earlier in that i forgot to subtract the wood width from the depth calcs, so my internal was wrong, but with 5/8 inch board the internal volume is......0.65 cubic feet. im pretty sure, but someone double check my math.
swez on 05/5/2004 19:05:40
Close enough as I got almost 0.67 cf. A bit small for best low end bass, but if you stuff with ~3/4 lb of polyfill, that will get you closer to 0.70... good enough.
Now, what amp and which voice coil version is it gonna be?
Swez
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