Hi folks newbie here, hoping someone might be able to offer advice, or provide me with a simple "No" if the bass I'm striving for is unobtainable under these conditions:
I built a simple system for the cab of my works Kangoo a while back. Consisting of: 1x 4ch amp and a cap underneath the two seats, a sub box in the disused passenger footwell and a pair of 6x9's seated in a partitioned oblong box bolted to the bulk head above the headrests. this is all I have room for.
The issues are oversized speakers in undersized enclosures. I wanted LOUD, so naturally like a dumb newbie I bought big before I even considered the fact that space wasn't at a premium. The small boxes I finally built are well constructed out of 18mm MDF and as big as I could make them to fit my requirements in the cab, but compared to what they should be they are miniscule:
2x 200wrms 6x9's, each in a 0.2cu ft! sealed enclosure. (Vibe QB69's. Hindsight, prob should have just gone from some insanely high power component speakers but hey ho, "they look meaty" I thought as I clicked "buy it now").
The primary purpose of the enclosure was to facilitate the positioning of the 6x9's in the only place they could go. Amp powered, the vibes perform well at 100hz and above as you might imagine, but below this they basically just make farting sounds, frustrating that all the amps power is wasted on them.
It does say in the manual they can be "free mounted". Does anyone know if there is any science to say I'm likely to obtain better performance figures in lower frequency's by getting out my hole saw on these tiny boxes? if so, any ideas what diameter might be an advisable starting point for a port in such a scenario?
Then there is the 12" 400wrms woofer in a sealed 1.20cu ft enclosure. (fli freq)
This isn't completely awful. In hindsight I see I should have gone for a 10" sub, but hey ho again. Anyway, as you might expect its insanely punchy, bridged channels of the amp are more than capable of obtaining some excellent excursion. But below 50hz its lame. So just as the 6x9's scenario really: Can anyone shed any light on how I might break the laws of physics to improve its bottom end performance? again had wondered Whether a small long port of specific size and diameter could help or ruin it completely? In which case i'll leave it and start saving for a 10" driver.
Many thanks in advance for any pointers. Its so frustrating because I feel there is such potential in this little setup, but the low frequency SPL's are hindered by the lack of sealable air space.
