Impressed with MTX JH4510
Ease of Use
I've had one MTX JH4510-04 for almost 1 year now in my 1999 Saturn. It is as loud and has the same sound quality as the first day. It's in a ported enclosure designed exactly as MTX has recommended; see manualslib.com JH4510. I had checked their box design with WinISD v0.44 and saw that its an optimum design; 27Hz; -3dB @24Hz; 109dB @200W RMS (Orion 250 SX); 40Hz due to the incredibly low 27Hz port tuning. This sounds great with a broad range of music genres: DJ Bass Boy, Skrillex, Metallica, Madonna, Tchaikovsky. You'll want a subsonic filter with a 18 or 24dB/Oct set at a few Hz below 24 Hz to prevent exceeding maximum cone excursion while also minimizing attenuation around 24Hz.
Pros: affordable loud quality sound, enclose small enough for the trunk of a compact car, only 200W RMS needed, hasn't blown with normal use