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TR-70(80) / TR-70(250)
Driver: Dynamic, 40mm Operation type: Open Impedance: 80 ohm / 250 ohm Sensitivity: 93dB / 93dB (at 1kHz, 1mW) Frequency Response: 5Hz – 35kHz Maximum Input Power: 100mW Weight: 298g / 304g Cable: Detachable 1/4” Stereo Phone (3m) Straight & Coiled Ear Pads: Normal Type & Thick Type Accessories: Carrying Bag, 1/4” to 3.5mm plug adapter
TR-80(80) / TR-80(250) Driver: Dynamic Operation type: Closed Impedance: 80 ohm / 250 ohm Sensitivity: 95dB / 96dB (at 1kHz, 1mW) Frequency Response: 5Hz – 35kHz Maximum Input Power: 100mW Weight: 292g / 298g Cable: Detachable 1/4” Stereo Phone (3m) Straight & Coiled Ear Pads: Normal Type & Thick Type Accessories: Carrying Bag, 1/4” to 3.5mm plug adapter
TR-90(80) / TR-90(250)
Driver: Dynamic Operation type: Semi-open Impedance: 80 ohm / 250 ohm Sensitivity: 90dB / 92dB (at 1kHz, 1mW) Frequency Response: 5Hz – 35kHz Maximum Input Power: 100mW Weight: 302g / 308g Cable: Detachable 1/4” Stereo Phone (3m) Straight & Coiled Ear Pads: Normal Type & Thick Type Accessories: Carrying Bag, 1/4” to 3.5mm plug adapter - See more at: http://www.fostexinternational.com/docs/products/New_TR-Series.shtml#content-3-tab-tab
Poll is for 250ohm version of these. I heard them at NAMM and they sound pretty nice. Some differences in sound between the models due to their open, closed, semi-open design though they all have the same housings and drivers. The larger earpads they come with feel much better than the small pads. I would classify the TR-70 as a bit more highs, and of course noise bleedthrough and bleed out from your own audio. TR-80 seemed pretty balanced overall to me and had the best noise isolation, though I would not say the isolation was amazing. TR-90 has the best sound IMO as it had the most low end and only minor bleedthrough.