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Jensen Transformers SUB-1RR
ISO-MAX Low-Frequency Audio Input Ground Isolator / Hum Eliminator
Jensen Transformers SUB-1RR ISO-MAX Low-Frequency Audio Input Ground Isolator / Hum Eliminator
The Jensen Transformers ISO‑MAX SUB‑1RR Low Frequency Audio Input Isolator is designed specifically for subwoofer amplifier isolation in home theater and automotive applications. The specially designed transformer in this unit provides unparalleled low frequency response while providing over 100dB of common mode isolation, to solve even the most difficult subwoofer installation problems. The zero dB insertion loss also prevents carefully calibrated system levels from being disturbed.
The SUB-1RR is housed is a sturdy metal enclosure, measuring 3.63" W x 2.6" D x 1.45" H., including the flanges. The flanges have mounting holes, which are handy for permanent installations.
If you're not sure which model to choose, please check out our Jensen Transformers Application Guide.
Please do not confuse the SUB-1RR with similar (but inferior) products. Jensen Transformers' ISO-MAX Studio-Quality Audio Isolators provide the ultimate signal interface solutions. They solve the fundamental problems associated with ground loops, without degrading signal quality.
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 SUB-1RR 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.
Ground Loops?
(or why the best planned systems sometimes sound bad)
It is a subject that is seldom discussed in manufacturers publications, or even in magazines of the trade, but ground loops can happen even in the most carefully planned A/V system. When ground loops happen, the result is unwanted hum. This hum is most often heard in powered sub-woofers, but may also be present in the main channels as well. Most powered sub-woofers use a signal-sensing circuit to turn the amplifier off when no signal is present, but ground loops can induce enough hum on the input to keep the amplifier running continuously.
Ground loops are often the result of the fact that sub-woofers tend to be powered by a different electrical branch circuit than the rest of the A/V system. It's easy to understand why, because the sub-woofer may be across the room, and/or it may require so much power that a single branch circuit just isn't enough to handle the load.
The result is that the neutral or ground side of the two circuits can be at a slightly different potential. It can be because one of the circuits is loaded more heavily than the other, or because one run is longer than the other, or any number of other reasons that are beyond the scope of this article.
Ideally, ground loops would be prevented at the design level, but if you are working with an existing room, it is not always possible or practical. Ground loops can occur in a mobile installations as well, because all of the amplifiers in the system have their own internal power supplies, and voltage drop percentages in a 12 volt system can be even more challenging than in a home system.
The Solution
The Jensen Transformers SUB-1RR is elegant in its simplicity. Just insert it anywhere in the audio line between the receiver or preamp LFE output and the sub-woofer input and it immediately provides these benefits:- Eliminates the inherent ground noise coupling mechanism
- Common-mode ground noise rejection of 105 dB at 60 Hz
- Extended low frequency response: -1dB at 0.4Hz, -3dB at 0.15Hz
- Extremely low distortion: 0.01% at 20Hz and -10dBV
- 0dB insertion loss with 600 Ohm source and 47k Ohm load
Immediately, the effects of the ground loop become a non-issue. Problem solved. There are not too many things that one can install in an audio system that can do so much with so little effort.
Don't Forget the Cables!
Good cables are very important in the fight against hum and noise. You will need at least two short patch cables in order to insert the SUB-1RR into your signal path, and you may want to consider upgrading your existing cable(s) as well. The SUB-1RR does not include any cables, but if you need them, we have some very high-performance subwoofer cables available. Please click here to see them!
Jensen Transformers' Description
ISO-MAX® Model SUB-1RR
Low Frequency Audio Input Isolator
- Designed specifically for sub-woofer amplifier isolation in Home Theater and Automotive applications
- Transformer ratio optimized for 0dB insertion loss in typical applications
- Special input transformer delivers unparalleled low frequency "flatness"
- High-Grade Nickel-Iron-Molybdenum alloy cores for extremely low distortion
- Faraday shielded windings for maximum common-mode and R.F. interference rejection
- High quality gold plated connectors for long term reliability
Here you can see the gold-plated RCA type input and output jacks.
Here is a peek inside the device.
Here is the box.
Here is the documentation, including specs. Click to download in PDF format.
Why Cable Solutions?
- Cable Solutions is an Authorized Jensen Transformers Distributor, so our customers are ensured full warranty protection and technical support. (Jensen Transformers is obligated to provide neither warranty nor technical support for products purchased from unauthorized resellers!)
- We stock this item locally so that it will be ready for immediate shipment, and no one works harder than we do to get your order shipped out to you fast! On business days, orders that are funded by noon will ship the same day. Orders funded on weekends or holidays will ship the next business day.
- Customer service is our first priority. We do our best to help you find the best solutions for your particular application. We're enthusiasts too, so we know what it's like to wait for cables and accessories that are needed to hook up new gear. We also know how important it is to be able to get a response when you need help, so you'll often find us working long hours in an effort to get you the answers that you need.
- If you have had enough of outsourced support or worse yet, companies that do not even publish a phone number or a functional email address, we think you will be absolutely delighted that you found our company. We know how important it is to be able to get help when you need it. That's why we have people, right here in Texas, ready to respond to your email or answer your phone call. If English is your language of choice, you will have the simple pleasure of communicating with people whose first language is English. Granted, if you call on the phone, you may detect more than a trace of a Texas accent, but that is to be expected when dealing with a family-owned business run by native Texans. We sincerely hope that you will find our heritage of courtesy, honesty, and an ethical way of doing business to be a refreshing experience.
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.