This was definitely one of the best looking subs that day. Really gorgeous finish and details. Although I was a bit worried how badly those small ports would "whistle" during testing (four approx. 1.5" diameter ports equal with a single 3" port). The Heco uses a 300 W (RMS) D class amp which stayed really cool during extreme testing. The crossover can't be bypassed, so you can't use this with speakers needing a crossover higher than ~100 Hz. The lowest setting is only around 60 Hz. Frequency response could extend a little bit deeper, now the -6 dB point was at 26.5 Hz. Maximum output started to look really good until the 110 dB started to compress heavily at the lower frequencies; I'm pretty sure a larger port would have helped there. In mid/upper bass range the max output goes well over 105 dB. THD stays reasonably low at lower levels, but shoots the skies below ~35 Hz at higher levels; luckily it's mainly 2nd order. Group delay should not be audible at any frequency. Spectral decay is pretty typical for a vented subwoofer, with some ringing around the tuning. Spectral contamination stays slightly lower than average at 90 dB and 95 dB levels. One could squeeze a little bit more performance out of a 15" ported sub than the Heco shows.
+ Pretty good extension
+ High mid and upper bass maximum output capability
+ Low overall distortion up to 100 dB output level
+ Build quality and looks
- Deep bass output/port compression at higher levels
- Somewhat high deep bass distortion at high output levels
- Some ringing around the tuning frequency
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