With a 1â silk dome the TD25F-4 from Dayton Audio produces smooth and natural high frequency output. The semi-horn loaded faceplate helps to control the off-axis response while recessing the dome for extra protection. An Fs of 900 Hz makes this tweeter suitable for use with a crossover as low as 2,000 Hz for an easy transition to most 6-1/2â woofers. The TD25F-4 is an excellent choice for use in cost effective, but high performance, 2-way speaker systems.