So who does not expect a miracle and want eg only passive speakers amplify a little, this little part can buy confidently. When considering the price I have to say value is OK. It is certainly not a high-end device but for under 5 euros expected that indeed none. And if you want sound for really half an hall, should ask themselves whether they have entered the correct keyword or perhaps should set the price level high! HighEnd begins to halt only in the upper price segment.
A little tip before the MP3's with eg MP3Gain (there with Chip) bring on a sound level.