Short answer: the JBL PRX915. Both are rated 3.9/5 for sound quality (#15 and #14 of 76 15-inch pa speakers), and the JBL PRX915 costs $999 against $1,775 for the FBT Promaxx 114A, with sound quality a draw, the lower price decides it.
The FBT Promaxx 114A is the more accurate option. A light powered PA speaker with good sound, loud peaks and three built in monitor angles for floor use. Its measured preference score, a predictor of how neutral it sounds, is 4.09 against 2.40 for the JBL PRX915. The catch: Measured bass reaches only about 88Hz (-3dB) with a 73Hz ideal-subwoofer extension point, so it does not go as deep as the woofer size suggests.
The JBL PRX915 is the deeper-bass option. A powered 15 inch PA speaker with good sound, fairly deep bass, app control and built in EQ and feedback suppression. Its bass reaches about 58Hz before falling 3dB, against 88Hz for the FBT Promaxx 114A. It keeps a wired aux input, which the FBT Promaxx 114A lacks. The catch: Its measured preference trails the 12-inch JBL PRX912, and at 53.1 lbs (24.1 kg) it is meaningfully heavier to carry to a gig than the smaller model.
Buy the JBL PRX915. Both are rated the same for sound quality, and it costs $776 less than the FBT Promaxx 114A.
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Specifications Side By Side
| FBT Promaxx 114A | JBL PRX915 | |
|---|---|---|
| Price | $1,775.00 | $999.00 |
| Ranked | #14 of 76 in 15-Inch PA Speakers | #15 of 76 in 15-Inch PA Speakers |
| Passive | No | No |
| Configuration | Active 2-way bass-reflex PA speaker | Active 2-way bass-reflex PA speaker |
| Drivers | 14” neodymium woofer with 3” voice coil, 1.4” compression driver | 15” woofer, 1.5” compression driver |
| Frequency Response | 45Hz - 20kHz (manufacturer specified) | 48Hz - 19kHz (-10dB, manufacturer specified) |
| Amplifier Power | 700W RMS Class D (LF) plus 200W RMS Class H/AB (HF) | 2000W peak / 1000W RMS |
| Maximum SPL | 135.5dB peak (manufacturer specified) | 133dB peak (manufacturer specified) |
| Coverage | 90° x 60° | 90° x 50° |
| DSP | Yes | Yes, 12-band parametric EQ and dbx DriveRack |
| Cabinet Material | Polypropylene | Polypropylene/talc composite |
| Rigging | Three built-in monitor angles (12°, 40°, 55°) | 6 x M10 suspension points; dual 36mm pole sockets |
| Weight | 41.4 lbs (18.8 kg) | 53.1 lbs (24.1 kg) |
| Bass Extension (-3dB) | 88Hz (measured, vendor Spinorama data) | 58Hz (measured, vendor Spinorama data) |
| Bluetooth | No | Yes, control via JBL Pro Connect app |
| Spinorama Preference Score | 4.09 | 2.40 |
| Spinorama Preference Score with Perfect Sub | 7.12 | 4.77 |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | No | Yes |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Microphone Input | No | No |
| Guitar Input | No | No |
| Dimensions | - | 28.2”H x 18.3”W x 15.1”D (717 x 465 x 383 mm) |
| Inputs | - | 2 x XLR/TRS combo, 3.5mm aux; 2 x XLR thru and XLR mix outputs |
| Crossover Frequency | - | 1920Hz |
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