Description: Two-way, rear-ported, bass-reflex loudspeaker with laminated wood cabinet. Frequency range: 39Hz–23kHz. Impedance: 7 ohms nominal, 3.8 ohms minimum, at 5.5kHz. Sensitivity: 87dB/2.83V/m. Minimum amplifier power: 40Wpc.
Dimensions: 16" (405mm) H × 9.5" (240mm) W × 16.9" (430mm) D. Stand height: 29.1" (740mm). Weight: 27.5lb (12.5kg) each loudspeaker; 17.6lb (8kg) each stand.
Finish: Solid wood with parts made of chrome and aluminum.
Serial numbers of units reviewed: Numbered pair 371 (auditioned), 326 (measured). Manufactured in Vicenza,…
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Sidebar 1: Specifications
Sidebar 2: Associated Equipment
Analog sources: Linn Sondek LP12 turntable with Keel chassis, Karousel main bearing, Radikal motor control, Naim ARO tonearm, and Lyra Delos cartridge.
Digital sources: Naim UnitiCore network server and S/PDIF source. Roon Nucleus +. Naim ND555 Streamer-DAC with dual 555PS(DR) power supplies.
Preamplification: Townsend Allegri Reference, Naim SuperLine-SuperCap DR phono preamplifier.
Power amplifier: Naim NAP250 2024 series.
Loudspeakers: FinkTeam KIM, BBC LS3/5a (15 ohm), Magico A5.
Accessories: Several 4- and 5-tier point contact Naim…
Sidebar 3: Martin's Measurements
Basic measurements were undertaken to confirm the condition of these UK review samples and help coordinate with John Atkinson's full tech report on his US example. I checked the effect of the near-vestigial grille; I found little to note save errors of less than 1dB in the mid-treble from its addition, increasing to 1.5dB at 15kHz. I consider such changes negligible, as I could not reliably hear the effect. I think that is because the strand spacing is wider here than when I had previously encountered this design detail with a Sonus Faber design…
Sidebar 4: Measurements
I measured a different sample of the Franco Serblin Accordo Goldberg loudspeaker to those auditioned by Martin Colloms. Mine had the serial number 326. I used DRA Labs' MLSSA system, a calibrated DPA 4006 microphone, and an Earthworks microphone preamplifier to measure the quasi-anechoic frequency- and time-domain behavior in the farfield. I used an Earthworks QTC-40 microphone, which has a ¼" capsule, for the nearfield responses.
The…
The hi-fi receiver has been many different things. Early examples, like the Harman Kardon "Stereo Festival" TA-230 from 1958 (said by modern-day Harman/Samsung to be the first stereo receiver; footnote 1), featured separate FM and AM monophonic tuners that could assign a speaker to each if you wanted to listen to what was then a fad: stereo broadcasts over two stations (left channel over FM, right over AM, for instance). Standardized FM stereo broadcasting began in 1961, and by then, receivers had evolved into large, complex, nearly complete stereo systems; an example of that was the Fisher…
I decided I'd "pull up the patient pants," as my wife often advises, and set it up by the book: the user manual. The book says to download the app first and use it for setup. This proved the right move, as navigating the device's menu tree is time-consuming with the remote and even more so using the front-panel buttons and knobs. The app was a bit clunky when it came to pairing the unit to my Wi-Fi network, which required several attempts but ultimately worked. I could have plugged in the Ethernet cable and connected quicker, but I wanted to use this with Wi-Fi since I figured that would be…
Sidebar 1: Specifications
Description: Solid state stereo receiver with HD Radio/FM tuner, optional phono preamp (MM or MC), on-board DAC/streamer, full-function preamp with analog bass/treble controls and stepped-resistor relay volume control, class-AB amplifier, front panel output-power meters and green/black LED display. Inputs: 3 analog (one balanced); 3 S/PDIF digital (1 coax, 2 optical TosLink); 1 USB host for hard drive or memory stick; 1 USB DAC; 2 HDMI-ARC (audio return channel); Wi-Fi and Bluetooth via two external antennas (included); Ethernet LAN port; 12V on/off trigger via 1…
Sidebar 2: Associated Equipment
Digital sources: dCS Bartók streaming DAC, Oppo DV-981HD universal disc player.
Power amplifier: Benchmark AHB2.
Loudspeakers: B&W 808, Amphion One18, Marantz Imperial 5G.—Tom Fine
Sidebar 3: Measurements
I performed a full set of measurements on the T+A R 2500 R using my Audio Precision SYS2722 system. Although the R 2500 R's Menu can be accessed with the front-panel and the remote control buttons, I found it easier to use the T+A MusicNavigator G3 app, which I installed on my iPad mini after connecting the amplifier's Ethernet port to my network. (Not all the settings are available with the app.) The amplifier is specified as having a maximum output power of 140Wpc into 8 ohms; I preconditioned the R 2500 R before the measurements by following the CEA's…
To examine the performance of the R 2500 R's DAC, I used the coaxial and optical S/PDIF inputs, both of which accepted data sampled at rates up to 192kHz, and USB data sourced from my MacBook Pro. The USB Prober utility identified the R 2500 R as "R 2500 R" from "T+A elektroakustik," with the serial number string "3932343130335107001D0027," and indicated that the USB port operated in the optimal isochronous asynchronous mode. Apple's AudioMIDI utility showed that the T+A accepted 24-bit integer data via USB sampled at all rates from 44.1kHz to 768kHz.
The T+A's digital inputs preserved…