It depends on the speakers.
Quote:
Originally Posted by Thefrugalear
You guys leave your speaker grills off or on? Can you really hear any difference in sound? I can't. The guy at the store said he can.
It really does depend on the speaker. I would say most speakers sound better with the grilles off. Audio magazine used to measure speakers with the grilles on and off and the biggest effects are usually in the upper midrange and treble region. Stereophile often reports on this, too.
However, a number of manufacturers have taken advantage of the grille structure to reduce diffraction effects from the speaker cabinet. My ancient Kef 104aB speakers definitely sounded better and more focused with the foam grilles on. For some time, Paradigm Reference speakers have been designed to measure and sound better with the grilles on, and this now seems to be true for the Monitor series as well. I presume the new Signatures work better with the grilles on, too, but I have seen no measurements as yet. PSB also makes use of the grilles to good effect, and the PSB Stratus Minis measure and sound better with the grilles on--you can check this on line in the review done by Stereophile. I think the same is true of a number of other manufacturers as well. It does seem to me that since most people use the grilles that it is a good idea to design them so as to interfere the least possible with the sound or even to improve the performance.