Sensitivity Issues

Eleonida, excellent afvice, IMHO!. A few rules of the thumb waiting for cognoscenti. The Ohm load doubles (or halfs, as it were) per 3 db rating. I would pounce on 91 vs 88 dbs (the difference could mean a bigger amp, try getting THAT past yr wife -- or mine, for that matter). Resistance plays with the sound spectrum and average 8-4 ohms is, usually, happily dealt with by most amps. It doesn't compensate in the way I think you think it does (i.e. make things easier, low load but low resistance, so my amp loses on one and gains on the other). Beware of low resistance, it requires mamouth efforts to control... in other words, it'll suck the juice (the life) out of yr amp.
Concluding, if U like yr music at reasonable levels and, worse still, listen to classical, go for sensitive -- 89 upward -- speakers, and check out their lowest resistance rating. Most modern speakers play around a minimum of 4; yr Pass can easily match that.

While i don't know know what all the reviews or even Pass Labs will tell you, my experience with Nelson's older designs tells me that your amp should easily deal with lower impedance loads. While his amps may not have as much current as some of the other big boys, they don't "flinch" when put to the test like many other reputable brands that shall remain nameless.

One thing to keep in mind is that the lower you go on speaker impedance, the lower the damping factor will be. If the speakers use a BIG motor structure ( large voice coil & magnet assembly ) or are relatively reactive loads, you can expect less than the best in terms of control and definition.

Since you did not mention room size or types of music that you like to listen to, we're kind of guessing here as to what will work acceptably. As such, shoot us more info and you might get some better info.

I'm assuming that you don't normally try to "raise the roof" since you selected an amp that was rated at 30 wpc. With that in mind, something that is at least 87 db's should be acceptable with something in the low 90's being easier on the amp ( in most cases ). Only problem with this is that many speakers that are more sensitive use some type of bass loading ( port, passive radiator, bass reflex, etc..). As such, they sacrifice bass definition and timbre for extension and "better numbers". Like anything else, there are trade-offs involved in everything and not knowing your preferences makes it difficult to make a valid suggestion. Sean
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Eleonida: Good questions, but no hard fast answers. I have tried out some speaker/amp combos that looked good on paper as far as the manufacturers specs for the equipment went, but that were a total bust. I am running 90db, 4ohm speakers with a 7watt per channel tube amp and the low ohmage does not seem to add the dreaded flab to the bass response, it sound great. I tried running a pair of Linn Tukans with a 50 watt/channel (70+ in reality and 140+ into 4 ohms per the review specs) SS amp and it would not control the low end of the 4 ohm Tukan's. The same amp ran a pair of Reynaud Twins (also 4 ohms) fine. Either the specs are wrong or there is more to it than the numbers. If you can, go for 90db (which is fine) or more (it's a nice range for many amps and rooms), but try to home demo the speakers before you purchase them. If this is not possible then hookup with fellow listeners that have your amp and see what has worked for them. Perhaps list your complete system (with the room size and your current speakers) in this or a new thread and list what you would like to improve. I can't imagine that mismatches like this are commom place, but they do happen and I would hate to see you stuck with one, especially with your wife watching/hearing. I purchased my amp (not my speakers) without an audition, but did so after checking it out with other owner's that I located on the web and everyone else that ever wrote a review or commented on auditioning it.