Originally Posted by SilkyStrings
I imagine two cabs together also increases this efficiency?
yes doubling of speaker area will increase sensitivity by 3dB
So a single 12 would be 96dB
and a 2x12 would be 99dB
and a 4x12 would be 102dB
and a 8x12 would be 105dB
and I highly recommend using a minimum of 2 drivers
it is why my opinion is a 2x12 or 2x15
would satisfy almost 80% of all bass players
which gives decent power handling and average sensitivity
of 99 to 101 dB
10" speakers lack sensitivity a 4x10 only hits 97 to 98 dB
plus the dispersion is lacking
A vertical 2x12 could perform similar or equal to a 4x10
but a 2x12 could have more lowend and depending on driver used actually have more highend than a 10". Plus being a vertical alignment will offer more off axis response. Which is beneficial to the player and band members. Plus a higher stack offers better monitoring on stage for the player simply because its closer to ear level.
Keep in mind there is many lowcost 2x12 cabinets that would never keep up with a 4x10. But a high quality 2x12 with 5mm or higher xmax would do just fine.
The only real drawback to stacking single high quality 12's
is the cost is higher.
Otherwise single 15's are not much larger, but offer the highest
sensitivity. average 15 is 97 to 99dB
so a pair of 15's is the best bang for the buck for having a portable system with good sensitivity and needing less power.
People tend to laugh at 200 to 250 watt heads, but its really all you need with a efficient speaker system.
Even at that a overdriven 150 watt tube head will have alot of presence in a band.
Just goes to show when JBL came out with 5mm drivers with better thermal ratings. A 2x15 cabinet loaded with K-140's
could still make 80% of bass players happy.
And the more robust fullrange neo speakers of the day dont really go much beyond 5mm. they are just lighter.
So Sunn and Fender figured this krap out over 40 years ago with there 2x15 cabinets
you just had to be able to afford the upgrade speakers offered by Fender or the standard speakers offered by Sunn.
maybe the weight is the only limit, but modern neos and cabinet design has fixed that. Single 12's or 15's should fit in just about any car.