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The Jensen Transformers ISO-MAX model SUB-1RR Low Frequency Audio Isolator is designed specifically for
sub-woofer 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 sub-woofer installation problems. The zero dB insertion
loss also prevents carefully calibrated system levels from being disturbed.
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.
It is a small device, 4.32" long, 2.60" wide, and 1.45" tall, so it fits just about anywhere.
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!
Why Cable Solutions?
In-stock items are 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.
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.
Miscellaneous
Please click here to read our policies and disclaimer. Thanks for reading
all of this!
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