The Michael Phelps Legend Series is Master Spas' flagship hot tub line, and the LSX 900 and LSX 800 sit at the top of it. Both carry the full Legend Series feature set: Xtreme Lounger, Xtreme Therapy Seat, StressRelief, Master Blaster Foot Therapy, Bio-Magnetic Therapy, Orion Light System, Cabinet Lighting, EcoPur® Charge, and the full premium options list including the Master Clear Salt System, QuietFlo, and Fusion Air Sound System. So unlike some comparisons, this one is just about size and capacity.
The specs, side by side
| LSX 800 | LSX 900 | |
|---|---|---|
| Seats | 6 | 8 |
| Dimensions | 94" x 94" x 38" | 108" x 94" x 38" |
| Jets | 70 + 2 Master Blasters® | 72 + 2 Master Blasters® |
| Water capacity | 410 gallons | 490 gallons |
| Dry weight | 1,330 lbs | 1,485 lbs |
| Full weight | 5,860 lbs | 7,055 lbs |
What the numbers actually mean
The LSX 900 is the largest hot tub Master Spas builds, full stop. The extra 14" in length over the LSX 800 is what makes room for two more seats and 80 more gallons of water. If you regularly entertain, have a larger family, or just want the flagship of the flagship series, this is it. It's also the heaviest model in the lineup by a wide margin, which matters for planning your pad and delivery access.
The LSX 800 gives you nearly the same jet count and the identical premium feature set in a footprint that matches the smaller LSX 30 and LSX 850. That's useful if your patio has a hard size limit but you still want the full flagship experience for up to 6 people.
Don't rule out the rest of the lineup
If neither of these fits your space, the Legend Series has three other models worth a look: the LSX 30 and LSX 700 (both 5-seat, smaller footprints), and the LSX 850, which seats 7 in the same 94" x 94" footprint as the LSX 800.
A spa this size is also a real logistics project. Weight, electrical, and access all matter, so the best next step is a visit. Come see the full-size mockups in any of our California showrooms and we'll walk through what your specific backyard needs.