Alctron HM-2 Hum Eliminator - Transformer Isolator - 1/4" and XLR Inputs
Alctron Hum Eliminator
If you often encounter an annoying hum in your guitar set up, from stage into your mixing desk and PA, or even in your home theatre, studio or broadcast set up, then you should look at getting an Alctron HM-2 Hum Eliminator. It does exactly as the name suggests, by putting a large transformer into the signal path it clears up the sound, removing ground loops noise so all you get is the sound you want to hear.
Passively Eliminating Ground Loops
The AC-HM-2 is a totally passive unit, requiring no external power supply and eliminates hum simply by removing any ground loops. Most ground loops pick up AC interference at a frequency of 50-60Hz. The Hum Eliminator terminates this ground loop, thus preventing the frequency cycle continuing. Because the unit is passive, there is no signal loss or degradation, so you can proceed with your performance, broadcast, or mix without worrying about interruptions in your audio signal path again.
XLR and 1/4" TRS connections
The HM-2 has either XLR or 1/4" TRS jack option for inputs and outputs, allowing it to be inserted into almost any chain. Wherever a ground loop is present, simply insert the HM-2 between the input/output section of the instrument/device causing you concern and that should effectively eliminate the hum. Note though, that if your device is noisy due to other issues such as faulty connectors, incorrect or degraded wiring etc, then alternative corrective action will need to be sought.
- Eliminates "hum" and ground loop noise
- Anodised aluminium case for long-lasting service
- Connections: XLR, and 1/4" TRS jack input and output
- High-quality dual transformers with flat,
- Frequency Response: 20Hz to 20kHz
- Maximum Source Impedeance: 1kOhm
- Minimum Load Impedance: 20kOhm
- Does not degrade audio signal
- Passive design
Hum EliminatorBy: Bill on 12 January 2023The item was purchased for a hum problem in a church public address system. The main amplifier was at the front of the building while the choir mixer was at the back. The two were connected with 30m of audio cable. It was this connection which brought up the hum. The connection was unbalanced. One side carrying the choir voices, the other the instruments. When the Eliminator was connected initially there was no difference at all in the hum level. The Hum Eliminator was opened up to see how it was set up. It was found that the Eliminator was set up for a balanced line. The audio connection plugs were then reconfigured to suit. Pin 1 was left. Pin 2 carried the 'hot' side and pin 3 the earth return line. Both sides of the main audio line were so changed to suit - and hey presto - no hum! This procedure required no surgery on the Eliminator just the input XLR plugs. As a passive device it was found that there was negligible level loss.
Worked for meBy: Thierry Berno on 4 April 2022Let me make a quick review of this product because there isn’t much out there. I live in Thailand where most houses and venues are not properly grounded. I play an Electric Upright Bass and sometimes got a loud and low ground noise. On some PAs it was almost unbeareable. I saw that device at a local shop for 30 bucks and despite the lack of reviews I took a chance and bought it. It solved my problem. Also tried it with a jazz bass (famous for its 60hz cycle hum) and it was silent. Bass as an instrument doesn’t need to have a lot of definition in the high end so I couldn’t guarantee you that this product would perform with for an audiophile rig but I didn’t notice any signal alteration or loss. Overall very happy with it.
The drum on the humBy: wayne wrangell on 23 February 2021What a great little gizmo!! I’ve always been annoyed by the hum/buzz that comes through my bass amp when I’ve got my passive bass guitar plugged in! I’ve seen some weird and wonderful ways of addressing this with some techniques found online, BUT when I saw this little wonder box, I thought ‘well let’s give it a try and see what happens’.....and it’s worked a treat! It’s fixed my little problem but it may or may not fix yours, but for the small $ investment, it could be GOLD!