What does the impedence curve of the Innersound look like? And its sensitivity?
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You apparently don't need a lot of power, but you do need a lot of current for the 2ohm load presented by these speakers. Do you know where in the frequency band this minimum load appears?
With an impedence swing as great as you describe, from just the bare numbers you given, it sounds like you may want(need) a high current, probably class A, SS amp, not a tube amp, although there are some large, expensive, heavy and powerful tube amps which can drive 2 ohm loads. (I have some mono tube amps which actually have a 2 ohm tap!).
What does the manufacturer say about tube amps? Don't they make a highly regarded SS amp designed for these speakers? Can they make any generic recommendations (assuming that they will not recommend any specific brands?
Maybe some folks who have these speakers will sign with their comments.........In the mean time find out as much as you can about the actual speaker impedence curve as you can, not just the minimum and maximum impedence. Wasn't this speaker reviewed by one of the major mag's? Perhaps they have already done some testing and published, ala Stereophile. Check it out.
You might talk to Terry and Steve at Western Reserve Audio Design:216-521-0900.Roger Sanders had them building a tube amp for Innersound (I-tube),before he departed that company.They are now selling these amps direct.KT-88 based at 150W/ch,I think they are called the 300s.
I know they have moved their business lately,if you try them and can't get hold of them -let me know.They are available for audition.
No,I haven't an affiliation with them.Roger directed my friend in their direction to help fix a NRG amp,since the company no longer exists.