Tube Amps Watts vs SS amp

In a nutshell since your speakers are 4 ohms the efficiency is 3dB less than the stated 87dB.

Hi Ralph (Atmasphere),

In this particular case the 87 db spec is stated to be based on an input of 1 watt, rather than on an input of 2.83 volts. Also, as I mentioned in my previous post the brochure for the speaker states that an input of 8 watts results in an SPL of 96 db at 1 meter, which is consistent with 87 db/1 watt/1 meter. So if those numbers are accurate the efficiency is 87 db, rather than 84 db.  

Best regards,

-- Al

VTL 300 Deluxe would work if you want tubes. Personally my AR-90s never really sounded that good with tubes. What you need is high current SS. I like Threshold myself. Using a 550E at the moment but my 300 worked well. I'd love a pair of SA/1 but need the coin.

wow lots of GOOD INFO, Thanks

Lots of bad info and misinformation too...

Atmasphere, thanx for the article. For certain humans are extraordinarily change resistant. That is an unusual perception for an engineer. Those that embrace change are the pioneers like Tesla, Ford, Musk and others less well known. Too bad non of them are politicians.
Under the power paradigm you want speakers of steady impedance and relatively high efficiency. How does Soundlabs achieve this with an electrostatic loudspeaker. My Acoustats drop perilously low at high frequencies. I had to put a1 ohm series resister on the primary to prevent my amps from overheating. I removed the stock transformer drive and put one large 1:100 Sowter transformer on them resulting in this behavior. Conversely I always shied away from McIntosh amplifiers because they used transformers. I am not sure how they use feedback but it would appear they applying the objectivity principle. I am sure you prefer not to make comments on other companies amplifiers but how do you think this affects their sound versus standard voltage driven SS amplifiers. My final question is, how do you keep your amps power driven without transformers. 
I have long forgotten what boxes sound like;-)