what the hell..!??
the first sub only goes down to 37hz
the second sub goes down to 38hz
my three-way speakers can get lower than that..!
all of these pre-made subwoofers (with and without amps) have a box tune that is at or around 30hz at best.
30hz is NOT low enough.. 20hz is better.. 10hz is pimping and 5hz is useable for movies.
i swear to god that the economy is pathetic.. 99% of the pre-built subs are gonna have a tune in the 30hz range.
you might as well use an EQ and take that 31hz slider and shove it all the way down and listen to your audio like that, because buying a pre-built subwoofer isnt going to help matters at all.
when the sub does try to play audio that low the box is going to lose all pressure and the sub is just going to flap back and forth and make a 'slapping' noise instead of producing something pleasurable.
i have a single 12inch woofer on each side of me.
i ported the box and tuned the thing to 28hz and then stuffed each box with polyfill.
unfortunately the tune of 28hz isnt low enough and i need to make new boxes with a tune of probably 20hz.
the trick is to tune the box as low as needed, because once the box loses air pressure the speaker cone is going to move back and forth at an exceptionally high force (which is perfect for trying to move lots of air at a very low soundwave)
think 5hz - good for movies.
and 10hz probably doesnt need a 3dB boost because the soundwave is so stretched out that the air-movement is desired rather than horn-amplifying a noise.
basically.. if you tune the box right, the box will lose air-pressure where you want/need it and the sub flapping without any pressure in the box is like having an equalizer with the far left sliders all the way up.
as the soundwaves get lower, the decibel level gets lower - but the sound pressure gets higher.
you need to find a nice blend that is smooth when going from one note to the next.
they say 20hz is audible to the human ear.. that means there is DECIBEL levels to be had, which means you need a box tune to help amplify that 'noise'
after that, there isnt any noise and all there is to be had is SOUND PRESSURE which is something you feel and not here.
it is a lot more fancy to make your own subwoofer.
you can go here:Speaker Enclosure Volume Calculator
and use the box calculator.
basically you would want to input the ideal size of the box so it fits comfortable in your room.. then play with the port size/length to get a tune of 20hz.
its easy to use pvc pipe with an elbow joint for a port.
you can also use the cylinder box calculation to compensate for the port.
because if you add a port, you will make the internal cubic foot of the box smaller (which means you need to make the box wider or taller or deeper to compensate and keep the tune at 20hz)
i would suggest dual 6 inch subs (but good luck finding some at that size with any sound quality)
get yourself a bash plate amplifier
get some MDF from a local hardware shop (usually sold in giant sheets that will need a truck to haul it home for about 30-40 bucks)
then you need some kind of glue to smear on the edges were one wall meets another wall (you dont have to glue the walls together, but you should screw them together and seal the seams with silicone or something)
and then all you need is a table saw.
a table saw is NUMBER ONE and the most important thing.
dont try to make straight cuts with a circular saw or jigsaw.. these are not the right tool for the job and will only cause embarassment (no matter how steady you think your hand is)
and to top it all off you need to get some aero-port caps that are basically flares that go on the end of the port to keep the air from making noise as it enters/exits the port.
really makes it easy for the air to find the port and make its way out (one on each end)
a lot of the people in places like this have stock in products and they are trying to sell you something that will eventually result in more money in their pocket.
just dont screw around without a table saw.
you can use half inch plywood if you want.. just make sure you use a table saw.
and drill little tiny holes smaller than the screw before you drive the screw into the wood.
i could build you something for an example..
sub: Parts-Express.com:*Peerless 830452 10" XLS Subwoofer | Peerless 830452 10" subwoofer woofer XLS Nomex Cone speaker lf Driver bass shorting ring copper cap tymphany09
amp: Parts-Express.com:*Bash 300W Digital Subwoofer Amplifier | subwoofer amplifier subwoofer amp sub amplifier sub amp plate amp bash
set that amp up with a test tone and a multimeter so you dont put too many volts on the voice coil (which will make the coil get hot and melt the coating on the copper which will short the coil out)
with that much reserve.. you will have more dynamics for sound quality.
maybe you might interest yourself in a swapping of the caps in the bash amp for some superior quality capacitors made specifically for audio = even more details in the sound.
$300 + $50 for wood / screws / silicone
yeah its a bit much.. but that subwoofer is going to be worth much much more than you paid for it.
(think a retail price of at least $1,000)
i got some midranges from some tower speakers that cost $2,000 retail.
i only paid $30 for my midranges, and my entire project cost me about $280
but the sound is much much more than anything i could have bought pre-built for $280.
there is a huge craze to be had with building your own speaker boxes.
you can get the same performance for 1/10th the cost!!
and using a table-saw.. you really cant make a mistake unless you fall asleep making a cut.
and even then, if you fell asleep and pushed the wood into the guide.. there would be no errors to the shape of the cut.
i dont have a table-saw.. otherwise i would re-build my boxes and tune them lower.
its on my to-do list for when i have the extra money to rent a table-saw (or buy one) and can afford the cost of supplies.
if peerless made a six inch woofer i would recommend two of those (or even one of 'em with a high cutoff at 40hz and a low cutoff at 10hz)
you can make your jaw drop for little money if you purchase the speakers and make your own boxes.
there is a wave going around just like high-definition video.. except this is for audio.