I have a CVR12 and from what I have seen this sub should not be very good for ported enclosures. Yet I have a read a lot of reviews saying how great this thing is in a ported enclosure. Kicker even recommends it in the manual for "High Efficiency."
According to this the CVR12 should not be a very good sub to use in a ported enclosure:
https://www.carstereo.com/help/Articles.cfm?id=6
CVR12 specs:
QTS: .527
VAS: 3.37
FS: 26.1
Xmax: .498(12.64mm)
Basically I just want to know if there are exceptions to the info on that site. Are there subs that defy the rules of working well with a ported enclosure?
Thanks.
This is a good example of the "SQ vs. SPL" question. If you were to use the same size net volume for each type of enclosure...at 2.25 cu ft...the response in the sealed would give you SQ, and the response in the ported would give you SPL (with port designed as spec'd in the MANUAL). Either type specifies wattage input at 300 watts. The sealed nets a Q of .721 and an F3 of 38 Hz.
cb_response_kicker_cvr12.gif
The ported box has an F3 of 34 Hz with a much higher (7 db) response peak at 54 Hz. The following was modeled using the equivalent round port to what is spec'd in the manual and shows some port resonance at 284 Hz, which may or may not be the case using slotted...
vb_response_kicker_cvr12.gif
You can see the difference in SPL and also the difference in response. The sealed enclosure provides a nice output that would crossover nicely with the mid drivers. The vented is for louder sub bass. Depending on everything else in your system, one may sound better than the other, but for total Q the sealed box is the way to go.
-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
plain & simple.......port it if you listen to rap techno hip hop. better low freq. response. Granted the Power Acoustik KSW12 is the exact same sub... its a lot of air space but they sound great. My asst. "Candy " has three and they POUND
Gumby
-------------
Uncle Gumby
As you can see if you looked at the graphs I posted, the ported does not, in this case, extend the low freq response. (tcbturbosux, that's a generality....plain & simple). In fact, the lows drop off quite steeply.
You have to look at the specs, particularly the EBP, of the sub (Fs/Qes) and see which way the sub should be enclosed. If it tends to have a low EBP like this sub has, it is best used as sealed. However, and we're still talking about THIS particular sub, porting does increase SPL particularly in the 50 Hz range, which is further amplified by the car's cabin gain. If that's the way you have it and you like the sound and how it blends with the rest of your system, then it's good in your installation. But I wouldn't agree that the specs on this one defy the sealed vs. ported calculations because you can't get a flattened response (within reasonable means) when you port it.
-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
yes this is true with the relationship between ported and sealed. sealed tends to have a flater response but lower spl. and the ported there are hz levels that are amplifyed buy the port. so it has a better response at that level but the sealed has a flater response over the hole response graph. but it can be the exact oppesit in some speakers or subs because of the way that they are made. you match the box to the sub not the other way around. hope this helped
Aaron
-------------
Want to know some good equipment- JL,Adire Audio,Mcintosh,Brax,Helix,Eclipse,JBL,RE,Dimoand Audio,Zapco, pritty much anything DYhon,Forbidden recommend
On the12volt you give some info and you get in