|
The Jensen Transformers ISO-MAX model SUB-2RR 2-Channel Low Frequency Audio Input Isolator is designed
specifically for sub-woofer amplifier isolation in home theater and automotive applications. The
specially designed transformers 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-2RR 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-2RR is elegant in its simplicity. Just insert it anywhere in the
audio lines 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-2RR into your signal path, and you may want to consider upgrading your existing cable(s)
as well. The SUB-2RR 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!
|
