Your Thiel CS0.5 are 87db sensitivity / 4ohm nominal (3.2ohm min)impedance and are fine with your 60 wpc Pass Aleph 5 but probably challenge the amps on dynamic peaks a tad. If you like Thiel, then you can try the CS1.6 (entry level floor stander), which is a 90db sensitivity speaker with similar impedance characterisitics to the CS0.5. It should be more easy to drive than your CS0.5. They are in the $2600 range new here in the US but don't know pricing in Europe. The other suggestion is JM Focal 1007Be monitor speakers which is an 89db/8ohm nominal (3.2ohm min) speaker. Should be much easier to drive given the more forgiving impedance rating. Highly resolving like the Thiel and soundstages/images very nicely. More pricey than the Thiel CS1.6 but you may be able to get them within your budget used. Good luck.
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