Hvala za savete. Moram da priznam da taj isti Allan kaže i ovo, "Klippel company are a specialist supplier of test equipment to the audio analysis industry. They offer a laboratory analysis equipment package including recommendations for third party audio amplifiers. Here. Considering that the resolution of their analytical and laser systems is intertwined with the performance of the amp that drives the speaker under test, the recommendations must have been extremely carefully considered. They will have factored reliability, stability, frequency response, distortion, input/output linearity, input/output clipping potential, performance independent of speaker load and so on. Their business-to-business recommendation have potential legal, technical and reputational impact, and an ill judged amplifier recommendation could render a user's $100,000 investment in a state-of-the-art Klippel analytical system useless. This then is what the world's premier audio analytical company recommends to be the speaker driving amplifier: http://www.klippel.de/fileadmin/klippel/Bilder/Our_Products/QC_System/PDF/KLIPPEL_QC_Amplfier_Requirements%20.pdf I have ordered the second on the list. As Klippel say "Measuring single drivers, passive system or loudspeaker parts requires a professional power amplifier which is capable of providing the necessary power and signal quality for the measurement application. The demands on signal quality in measurement applications are usually higher than they are for music reproduction. We recommend QSC power amplifiers, which can be provided along with your KLIPPEL measurement system." All of the recommended lab-grade amplifiers are solid state designs. To reiterate: you can use any amplifier made in the last forty years or so, tube or solid state, to successfully drive your Harbeths at home. The more power available, generally the better. If the amp is in good serviced original condition I can pretty much guarantee great results but I cannot comment on the interaction between user amplifiers and other brands of speakers. If you want laboratory standard performance which eliminates any possibility of the amplifier altering the signal as it passes through the amp except in loudness, then you may have to look elsewhere than a hifi store, and select one from the Klippel list. Harbeth is unable to provide any opinions or recommendations whatsoever concerning tube amplifiers except to caution that the combination of tube amp and loudspeaker must be individually auditioned. The subject of 'what is the best amplifier' is now closed on HUG. The best amp is a completely neutral amplifier. If the amp issue is settled for Prof. Dr. Klippel and his team, that really is the end of the matter for Harbeth's designer. ==================================================================== P.S. If you believe that your audio amplifier should have a strong sonic personality and somehow reinterpret the music in a way you find exciting, do not buy any of the amps on the Klippel list. Their neutrality will disappoint you and you will have wasted your money. Far better to visit your audio dealer and seek out a speaker/amp combination that suits your tastes. Listen for yourself; arrive at your own conclusion. Don't take other's opinions as factual - you don't know the condition of their hearing and what their motives are. Be your own audio detective. Take pride in undertaking due diligence in the dealer's store and arriving at a proper conclusion. Then get on with enjoying the music. Ipak dasa ima stav i u odnosu na mnoge bar piše poštenije.