Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
The Deltalite speakers are direct replacements in most situations. The electro-mechanical specs are similar, so pistonic behavior is pretty close. What that means is you can expect them to act about the same for the first decade or so. Above that, differences in the cone make high frequency behavior somewhat different. I haven't investigated the Deltalite 2515 specifically, but I can tell you that the Deltalite 2510 is pretty close to the Delta 10, except for having less breakup mode energy up high. From Eminence's published data, I expect the 2515 is a good replacement for the Delta 15, and that it will work pretty well in a Theater four π loudspeaker. But I haven't tried one, so if you do, please let us know how it sounds.