The Retro Stereo 50 Vacuum Tube Amplifier with LS3.5 Speakers Bundle from iFi AUDIO utilizes four EL84X and two ECF82 tubes with an advanced ground-up circuit and is equipped with a Burr-Brown DAC chip to output up to 25W per channel. It supports digital and analog inputs, and outputs sound through the included LS3.5 speakers. Each speaker features a 1.1" horn-loaded tweeter, which uses a neodymium magnet, and a 4.5" paper cone woofer.
The Retro Stereo 50 Vacuum Tube Amplifier from iFi AUDIO utilizes four EL84X and two ECF82 tubes with an advanced ground-up circuit and is equipped with a Burr-Brown DAC chip to output up to 25W per channel. It features connectivity for both analog and digital audio devices, with stereo RCA, optical/coaxial combo, and USB inputs. Smart devices with Bluetooth are also supported, with aptX for high-fidelity wireless streaming from supported devices. NFC makes the pairing process easy. The Stereo 50 also has separate 3.5mm and 6.3mm headphone outputs, each with dedicated gain and sensitivity, to work with a wide range of both over-ear and in-ear headphones.
The Retro LS3.5 Speakers from iFi AUDIO features a 1.1" horn-loaded tweeter, which uses a neodymium magnet, and a 4.5" paper cone woofer. The small neodymium magnet structure shifts cavity resonances outside the audible range. Being horn-loaded, it matches with the wideband driver to create a vast sound field. The tweeter is used only at the very top end of the audible range; the whole range from 59 Hz to 8 kHz covering the fundamentals of all instruments except those with very low bass notes and all the formants is covered by the wideband driver, without any electrical or mechanical crossover.
The speaker's arrangement of the crossover for the tweeter (at approximately 10 kHz acoustic crossover) and the tweeter's waveguide, insets it for time-alignment with the wideband driver that further preserves phase/impulse response. The paper cone 4.5" wideband driver perform more like a full-range driver. The wideband driver rolls off after 8 kHz and it reaches down to 59 Hz (with correct placement).