Hey I have a kicker 400 amp that puts out 520 amp and an infinity perfect 10 DVC. All the wiring is shielded. Th problem I think lies here but not sure.... We went to infinity's website and looked up my sub and recomended box sizes and which inserts to use etc and with a ported box it said to have just under 2 cu ft and I have like 2.1, then it said to have the low insert installed in the sub which is the short one, and the insert I am talking about is the cylindrical billet piece of metalthat goes in between the magnets.now maybe I need to to have no insert or maybe the mid insert to hit higher and maybe the box is the wrong size? Thought we got it right and the port is like 2.5"x3" er something and like 4" deep..... any help is appreciated I like it to hit low but I want it to hit a lil higher than that as well. I cant even hear the sub on some songs...

 

Well,

A. That port sounds all screwed up on size....

B. The box size is CRITICAL in a ported box, as well as port size..

C. I've never heard of that plug that you're talking about on any speaker...

Did you build the box? If so what design did you use or did you just wing it?

 

Ported boxes are very tempermental and should be built for specific applications for best results.

What is this "insert" you're talking about? It sounds like you may have wired in a capacitor to filter frequencies which you don't want to do. You should do all filtering on the amp. You should have it set to LPF (low pass filter) and it should be set at around 80Hz (if variable, some amps have a fixed LPF).

 

The VQ has a pole piece insert to manipulate the Q of the woofer, so one sub with the right insert can work in ANY box.... pretty ingenious.... i have never worked with one of the new VQ series so i can't really comment on the correct insert for your application...

I would mess with the crossovers a bit to see if that helps.... and that box just doesn't sound like a good one.... with a 4" long port it can't be tuned too low.

 

Yeah I didnt know anything but my friend obviously wasnt totally sure either.... any suggestions on the box? I have messed with teh x over frequency and no matter what it doesnt go above 50-60 hrtz. Ported is louder I know than a sealed box so we were gonna try and go with that so if anyone could suggest a site or anyhting that could help us get the right specs for the box, maybe call infinity?

 

Check out Inifinity's website, the driver should have come with some suggested enclosure designes... try building one of those...

 

Yeah we did that, Im not sure its the box maybe the port is wrong but the sub doesnt even seem to move that much above 55hrtz as it does 50 and below, maybe its the insert?

 

hey about the inserts what exactly do they change. My friends seems to think its for cooling but that doesnt make sense to me, also it hits hard very low so I guess make the box smaller and it will hit a little higher better? How much would you change the port length on a box like this if the port is a 2x3 square. I could make another but ide like to see if I cn make this one better first...

 

first off, I think your tuning frequency is a bit too high, judging from the dimension of the port you gave us.

Infinity Variable Q (VQ) system is very nice. They are actually 2.5" outside diameter steel plugs that are shaped to fit vent in the back of the subwoofer. They come in two sizes. One made for Mid-Q and one for Low-Q. The High-Q can be achieve without the usage of the insert.
Knowing the plugs are 2.5", we know that the vented hole of the t-yoke is 2.5", otherwise the plug would just drop through. lol.

here are the rundowns on the plugs:

High-Q
-no plugs
-QTS: 0.6

Mid-Q
-2.5" outside diameter
-1.125" pole piece diameter
-1.875" long plug
- QTS w/plug: ~0.47

Low-Q
-2.5" outside diameter
-1.00" pole piece diameter
-2.875" long plug
-QTS w/plug: ~0.32

noticed how the Low Q plug has more metal. Longer, smaller pole piece (more metal), and same outside diameter as the Mid-Q plug. We know that the more metal we have, the more magenetic flux we're going to have. I bet rthompson would know what happens when we have more flux

We increase the BL (motor force) with more magnetic flux (obviously). Not only that, if all else are equal, and BL only changes, the efficiency changes, since efficiency is a function of motor force. The Qts gets lower, so the need of box size will decrease also, usually. Small boxes will usually give up low-end extention (if you keep efficiency). Hence why subwoofers with lots of motor force work well in small boxes, but hinders in low-end extension.

To the opposite affect, no plug will raise the Qts, which in turns will require a larger box. I would say the large plug is best suited for Infinite baffle use, the mid-Q plug for semi large boxes for mix of efficiency and low-end extention, and the low-Q for space saving boxes


rthompson, maybe you should be the leader and stick some steel of your own into your sub and let us all know how it goes.

 

you're right. it doesn't make sense. If it were to be for cooling use, wouldn't we all want to have as much cooling as possible and use no plugs at all?

 

GENERALLY, always tune your box 12hz below the frequency you are trying to peak at. So if you're entering an SPL competition and wanna hit 55hz really loud, tune the box for 43hz. From there you can make minor adjustments, but it is definitely a good starting place.

 

A subwoofer hardly moves at it's tuned frequency. And being that it looks as if your port is tuned way too high.....

What the longest port you can fit in your box? Would 30in be too long? Try taking out both subwoofer inserts and making a box that 1.7cuft after sub displacement and make the port 4x5x32

 

hope this helps, I just spent like 15 mins, looking for it.