Hi Tom,
The Merlin will be 5 dB more efficient and offer a more uniform impedance curve with a low of 6.5 ohms while running at 8 to 9 ohms thoughout. The VSM MM would be a much better choice for you (than the VSM M) because they are more room filling and seem more sensitive. They will also sound more even and quite a bit more lifelike in the end. They also will be easier to match with ancillary gear. You will also find the amplitude more uniform and because of that the phase line will be more linear than the 2.5. IMHO, the 2.5 is a great speaker but not really competition for the VSM. The two use very different parts, technology and one costs considerably more than the other because of this.
Regards,
Bobby@merlin
The Merlin will be 5 dB more efficient and offer a more uniform impedance curve with a low of 6.5 ohms while running at 8 to 9 ohms thoughout. The VSM MM would be a much better choice for you (than the VSM M) because they are more room filling and seem more sensitive. They will also sound more even and quite a bit more lifelike in the end. They also will be easier to match with ancillary gear. You will also find the amplitude more uniform and because of that the phase line will be more linear than the 2.5. IMHO, the 2.5 is a great speaker but not really competition for the VSM. The two use very different parts, technology and one costs considerably more than the other because of this.
Regards,
Bobby@merlin