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The 25TAF-D (H858-NHT) has an aluminium dome and the voice coil is immersed in magnetic fluid.<\/p>\n T\/S Parameters:<\/strong><\/span><\/p>\n (click on picture to zoom)<\/p>\n The tweeter resonance frequency is within 1.5-4% from the official specification.<\/p>\n Impedance:<\/strong><\/span><\/p>\n (click on picture to zoom)<\/p>\n The two tweeter samples measures almost identical.<\/p>\n <\/p>\n The mid-woofer used in the 2.5i model is made by Peerless. The 6.5″ Peerless (830301) mid-woofer has a polypropylene cone with a concave dust cap. The basket is made of stamped steel and it has a small 72mm magnet.<\/p>\n T\/S Parameters:<\/strong><\/span><\/p>\n (click on picture to zoom)<\/p>\n The T\/S parameters are almost identical to the official specification. With its low Fs, high Qts and with an EBP of 45, this mid-woofer is made for a closed box configuration.<\/p>\n Impedance:<\/strong><\/span><\/p>\n (click on picture to zoom)<\/p>\n Almost identical impedance plot for the two samples with a small wrinkle around 850Hz.<\/p>\n <\/p>\n The sub-woofer used in the 2.5i model is made by Peerless. The 8″ Peerless (830302) sub-woofer has a polypropylene cone with a textile dust cap. The basket is made of stamped steel.<\/p>\n T\/S Parameters:<\/strong><\/span><\/p>\n (click on picture to zoom)<\/p>\n Slightly higher Fs and Qts compared to the official specification.<\/p>\n Impedance:<\/strong><\/span><\/p>\n![\"\"](\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/07\/2.5i_Pic18.jpg\")
<\/a>The tweeter used in the 2.5i model is made by SEAS and is basically the same driver as the SEAS 25TAF-D (H534) driver, but the one NHT uses is called 25TAF-D (H858-NHT). This tweeter version uses a slightly smaller face plate of 98mm instead of the 104mm used in the H534. The H858 tweeter version was manufactured in a separate line with tighter tolerances and quality control compared to the H534 version.<\/p>\n<\/a><\/p>\n<\/a><\/p>\nMid-woofer:<\/span><\/h3>\n
<\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\nSub-woofer:<\/span><\/h3>\n
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