Ultrasone has announced the latest product in its series of HFI headphones, the HFI-2400. The headphone features 40mm gold-plated drivers, while the companyís S-Logic technology is claimed to widen the perceived soundstage. MU Metal shielding is designed to help reduce the amount of magnetic radiation by up to 98% compared to standard headphones. The drivers are built with 70 Ohm impedance and produce a frequency range of 10Hz ñ 25kHz, with a sound pressure level of 94dB.