First and foremost, the K130 has a full octave of high frequency response that is absent in virtually every other offering, including the TT15 and other premium products from Eminence, to the extent that it took a LOT of high end eq to get most of the highs I am accustomed to. Added to that the midrange of the TT15 is also "honkier" than the tone of the relatively flat JBL, but again eq changes got it sorted, to fhe point that I intend to leave the Eminence installed as it trims 10 pounds of the carry weight of the amp.
The 8-ohm JBL has an industry-leading sensitivity (1w@1kHz@1m) of 103dB, the 4-ohm TT15 has a a still impressive sensitivity of 101dB, so volume per watt if reduced is at least in the same ball park, and the listed power handling of the TT15 is enough to handle the Webb's full 225 watts output into 4 ohms. At 8 ohms the amp delivers about 150 watts, a good match for the K130 and enough to achieve essentially the same volume levels as the TT15 with half the wattage.
Webb 6-14 performance settings
JBL K130
Sensitivity 10
Volume 3
Treble 2.5
Midrange 4.5
Bass 8
Eminence TT15
Sensitivity 10
Volume 4.5
Treble 6.5
Midrange 3.5
Bass 8
As can be seen, the primary differences between the two are in the midrange and high frequency response, with a small variance in overall volume. The high end roll-off of the neo speaker required a significant boost in treble eq but also eliminated a lot of spurious pick and string noise that the JBL loves to reproduce with great accuracy.
Bottom line, for me at least, is that this neo speaker is well worth the trouble and expense, in that I was able to dial in the tone I seek and lightened the load with a minimum of frustration. YMMV
