I've owned both tube and SS amps. I think the Cayin is in the 30-35 wpc range.
As some others have mentioned; GENERALLY a 30wpc tube amp as opposed to a 30wpc SS amp will play louder. They both only have 30wpc,no getting around this. But the way a tube amp "clips" allows it to play louder before distortion and clipping sets in. So effectively the tube amp has more usable watts. Most say 1 tube watt equals 2-3 SS watts. So the Cayin probably would be more comperable to a 60 wpc SS amp.
Second on your question about DB's. Swampwalker was talking about speaker effeciency. As he mentioned those in the 89-92db range should be able to play plenty loud.
A speaker with 89db will put out 89db sound pressure at 1 meter. A 92db speaker 92db at the 1 meter range.
Hopefully this may help: A 3db increase in sound pressure is a doubling of the volume. So the 92db speaker will play twice as loud as the 89db speaker with the same 1 watt. But the same 89db speaker with the same 1 watt will be twice as loud as a 86db speaker. This again is a general rule and still dosen't tell how loud the speaker will play or how difficult it will be to drive.
The catch though is that as humans we don't usually perceive a doubling in volume until it reaches near the 10db range. So the 92db speaker will not sound like double the volume though it actually is.
Bottom line after all this is; yes the Cayin should be able to play plenty loud if the room isn't too large and the speakers are reasonably effecient.
As some others have mentioned; GENERALLY a 30wpc tube amp as opposed to a 30wpc SS amp will play louder. They both only have 30wpc,no getting around this. But the way a tube amp "clips" allows it to play louder before distortion and clipping sets in. So effectively the tube amp has more usable watts. Most say 1 tube watt equals 2-3 SS watts. So the Cayin probably would be more comperable to a 60 wpc SS amp.
Second on your question about DB's. Swampwalker was talking about speaker effeciency. As he mentioned those in the 89-92db range should be able to play plenty loud.
A speaker with 89db will put out 89db sound pressure at 1 meter. A 92db speaker 92db at the 1 meter range.
Hopefully this may help: A 3db increase in sound pressure is a doubling of the volume. So the 92db speaker will play twice as loud as the 89db speaker with the same 1 watt. But the same 89db speaker with the same 1 watt will be twice as loud as a 86db speaker. This again is a general rule and still dosen't tell how loud the speaker will play or how difficult it will be to drive.
The catch though is that as humans we don't usually perceive a doubling in volume until it reaches near the 10db range. So the 92db speaker will not sound like double the volume though it actually is.
Bottom line after all this is; yes the Cayin should be able to play plenty loud if the room isn't too large and the speakers are reasonably effecient.