To supplement the higher frequencies, you can go with an external super tweeter but it could change their base sonic signature by quite a lot. They probably will need support from a subwoofer to improve the bass performance. The impedance is at 15 Ohms which all these specs do point towards the direction that these speakers are easy to drive. The speaker sensitivity is 93dB which is higher than we expected it to be. The frequency response of the Quad ESL 57 is rather interesting, as it is only 50Hz-10kHz. They require ample breathing space and do have a big footprint, small listening rooms are not really recommended. Instead of using the traditional driver units, the ESL 57 uses panels where one is for high-frequency and the other two for mid/bass frequency. If you look closely, you can see the intricate design of the speaker grilles which is like a work of art. Where conventional speakers in the past are big and bulky boxes, and here you see a futuristic-looking Quad ESL 57. The vintage design of the Quad ESL 57 speaker brings us back to the past, it looks absolutely special and we can only imagine how people felt when it was first produced. Sound Characteristics and Merits of Quad ESL 57 Best Amplifiers to match with Quad ESL 57.Sound Characteristics and Merits of Quad ESL 57.
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