Jensen Transformers SC-2NR Stereo Speaker to Line Audio Converter is a unique product that provides an elegant way to convert speaker-level audio to line-level audio.
Handy DIP switches make it easy to select input power ranges from 25 watts to 750 watts, making the SC-2NR compatible with a wide range of audio amplifiers.
The SC-2NR is an ideal solution for deriving sub-woofer inputs in pure stereo audio systems that do not normally provide subwoofer outputs. Channel-summing (mono output) models are available as well (by special order only), opening a whole new range of possibilities.
The configurations featured here has terminal strip inputs and high-quality Neutrik RCA outputs. Also available as professional (XLR) output model SP-2SX with Neutrik SpeakON® input connections a total of (7) different variations are shown below). This audiophile-grade Stereo Speaker to Line Converter is a completely passive device, so there is no chance of raising the noise floor of your audio system as might be the case with an active device.
The SC-2NR is housed in a sturdy metal enclosure, measuring 7.0" W x 3.5" D x 1.6" H., including the flanges. The flanges have mounting holes, which are handy for permanent installations.
At this point we typically like to remind customers not to confuse the SC-2NR with similar (but inferior) products from other manufacturers, but in this case, we know of no similar products, so even more than usual, the SC-2NR really is in a class of its own. Also available (by special order) as the model SS-2NR, tuned specifically for subwoofer inputs.
Both SC-2NR and SS-2NR can also be built as single-channel (mono) versions as SC-1NR and SS-1NR respectively, or as SS-1SR with Neutrik Speakon input. When built this way, and there will be only one transformer inside. The outside appearance is identical except that one of the channels will have blank covers instead of jacks.
With inferior products coming from all over the world, we think it is a genuine treasure to find a company like Jensen Transformers, actually designing and manufacturing some of the finest products in the world, right here in the USA, and we are proud to be able to offer their products. The SC-2NR is made in the USA, is backed by the manufacturer's comprehensive one-year warranty, and has a remarkable 20-year warranty on the transformer device itself.
Please check out our Jensen Transformers Application Guide for information on the other members of the ISO-MAX family.
Model SC-2NR is a two channel "speaker" level to unbalanced "consumer" level converter and ground isolator, designed to accept, in four switch-selectable ranges, speaker drive voltages of 14 Vrms, 25 Vrms, 44 Vrms, or 77 Vrms. These voltages will be developed at full output of power amplifiers rated at 24 W, 75 W, 240 W, or 750 W respectively into 8 Ω loads or rated at 48 W, 150 W, 480 W, or 1,500 W respectively into 4 Ω loads. Input ranges also include 25 V and 70 V lines used in commercial sound systems covering large areas.
Since the speaker inputs are ungrounded, they are especially useful with power amplifiers where both outputs are actively driven and cannot be grounded (these are often referred to as "bridge-mode" or "floating" outputs). The speaker inputs represent a trivial additional load for the driving power amplifiers - maximum input power is 0.08 W, 0.4 W, 1.5 W, and 5.4 W respectively in the four input ranges. In addition, all models provide inherent low-pass filtering to remove ultra-sonic switching artifacts from the outputs of "digital" or "class D" power amplifiers. These artifacts can cause subtle distortions in downstream amplifiers [Deane Jensen and Gary Sokolich, "Spectral Contamination Measurement," AES 85th Convention Preprint 2725,1988}.
The standard versions have dual, or "stereo," outputs that correspond independently to each of the speaker input signals. The SC-2NR output signals will reach 1.75 Vrms (+5 dBV) at maximum rated input - sufficient to drive any known power amplifier with an unbalanced input to full output power. This level represents 15 dB of "headroom" in consumer audio systems where the nominal or "reference level" signal is standardized at - 10 dBV or 0.316 Vrms.
These ISO-MAX units are entirely passive and require no power supply.
Here is another angle on the front of the SC-2NR.
The speaker-level input terminals are shown in this photo.
Here is closer look at the SC-2NR front panel, showing the high-quality Neutrik RCA output connectors in greater detail.
This is a closer look at the back panel.
The Jensen Transformers SC-2NR comes packed in a foam-lined box, as shown here.
This is the User Guide, in PDF format.
Design excellence, high quality materials, meticulous workmanship, and superior service...put it all together and you get a superior product. Don't get stuck with bad advice, poor service, slow shipment or an inferior product. If you want the best, here it is.