Ever wished you had a device that would allow you to load your system however you wish reguardless of coil configuration ? Thats what the Accumatch is meant to do. They are an impedence driver that can divide impedence by 1/2, 1/4 or 1/8, or multiple impedence by 2, 4 or 8. Sounds ideal for those of us stuck with stupid impedences like DVC 6ohm..

Test System:
"Team JBL" Festiva Trio hatch
2x SuperCharge Gold 720CCA cells
1x Exide Evo 320CCA cell (under hood)
Alpine CDA-7949 Headunit
1x JBL Crown 2200 amp
1x JBL W15GTi subwoofer (DVC 6ohm, parallel for 3ohm) in 6.8 cubes tuned to 52hz

Test Equipment:
1x DMM
1x TermLAB USB Sensor

Seeings as how this system was already calibrated for SPL purposes, there was no need to set it up again . With fresh batteries it'll pump 146.0dB on TermLAB all day long.
Seeings as how I have a pair of AM-500's (500WRMS power handling each), I connected them parallel to double their power handling, and fused the common -ve wire (wasnt keen 2+Kw fusing the things and blowing an amp). Also ran them in 1/2 drive mode.
The Crown 2200 also features two modes, high voltage (bridged channels) mode for high impedence work, and high current (paralleled channels) for low impedence work, allowing them to make full power into 4ohm-1ohm. Ever wondered what makes Crown's special ? Now you know.

Tests conduct without clipping, with clipping, and back to back with/without.

With Accumatch installed:
1.5ohm, Unclipped, Bridge Mode = Protection
1.5ohm, Clipped, Bridge Mode = Protection
1.5ohm, Unclipped, Parallel Mode = 140.5dB
1.5ohm, Clipped, Parallel Mode = 140.5

Without Accumatch installed:
3ohm, Unclipped, Bridge Mode = 144.0dB
3ohm, Clipped, Bridge Mode = 144.5dB
3ohm, Unclipped, Parallel Mode = 142.0dB
3ohm, Clipped, Parallel Mode = 142.5dB

In Veritas defense they do recommend not using the AM-500 for SPL purposes and that you use the AM-1200 full range. However, I payed a fat wad of loot for them and dammit I'm gunna try it anyway.