The built quality of this DIY sub is very high. The enclosure didn't resonate at all even at highest levels. It features an external NAD power amp and a DIY crossover/EQ unit. The driver used was an Infinity Kappa Perfect 12". The sub has a quite optimum sealed sub frequency response. The slope starts at 50 Hz and descends at a rate less than 10 dB/oct., which tells that the final Q of the system is really low. In-room frequency response should be pretty flat down to single digits due to room gain. It does fairly well regarding max SPL when noticing that the Kappa Perfect isn't the most robust driver one can get these days. THD goes pretty high at lower frequencies and at higher output levels though. Regarding group delay and spectral decay this sub is among the very best I've ever measured. Spectral contamination test shows average maximum output capability with higher than average overall distortion. Multiples of these would be quite a performer even at high output levels.
+ Good frequency response for a smaller room
+ Low distortion up to medium output levels
+ Extremely low group delay and short decay time
- Medium maximum output capability
- High deep bass distortion
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