This little guide can help you with the purchase planning, rebuilding or after the move. It shows you how you can set up and connect your Hi-Fi system.

Impedance Of The Speakers

This section is interesting for you if you want to put together a new system. But also if you renew the amplifier and / or the speakers. The magical term for many people is “impedance”.

Simplified, the impedance is an AC resistor due to non-uniform voltages and currents. Information about the respective impedance values ​​can be found both at the speakers and at the outputs of the devices (receiver, amplifier). Much has already been said about the permitted and permissible combinations.

At the amplifier outputs are the recommended values ​​for the load resistance (impedance) of the loudspeakers. For higher value systems there are several outputs with different values. A hi-fi system delivers the best sound when the output impedance of the amplifiers and the load level of the speakers match.

The following combination also works: 8 ohm speaker, 4 ohm device output. However, in this case losses occur in the way that the full volume is not reached.

The opposite should be treated with caution: loudspeaker 4 ohms, device output 8 ohms. Overheating at the amplifier can occur here. This danger is contained at least in more modern devices by protective circuits. If you notice an increased heat development, you can create sufficient cooling by increasing the distances. If possible, direct the bass via subwoofer.

Position Of Components

Right at the beginning the most important insight: Try to be smart! Peter Lustig would say, “Sounds funny, but it is.”

If you are planning a new purchase, please consult a specialist shop (!). Prepare for it:

  • Make a sketch of the room in which you want to set up the hi-fi system.
  • Mark sloping ceilings and columns.
  • Which inventory is still in the room.
  • How is the space used predominantly.

The correct position of the individual components leads to an optimal sound result. These include:

  • Boxes and subwoofers
  • Racket with the plant
  • listening Position
  • Room layout and inventory

Not necessarily the exorbitant price of the hi-fi system guarantees a full sound! Space and facility must harmonize with each other. Nevertheless, there are some basic rules to consider:

  • Decisive for a good room acoustics are above all the boxes, less the cable length. Use cables with 2 x 4mm² for this purpose.
  • The signal path between the box and the listening position must be free.
  • Do not place the system near the speakers.
  • Position the tube amplifier at least one meter apart.
  • Do not be discouraged by the space geometry (long / narrow, wide, L-shaped). Try different variants when setting up your hi-fi system. The enjoyment of music in the end will be your reward for the effort.

How To Fix The Speakers Humming

This is almost the “worst case” for any music lover: they turn on the system and hear a humming sound.

Multiple Grounding

A common cause is that several devices are grounded at different potentials via the protective earth of the mains socket. It forms a humming loop that reacts like a sensitive antenna. Faults through the house network cause an induction voltage. The resulting voltage drop is evaluated as a signal, resulting in the unwanted hum. The remedy is a common power strip, so that all devices are earthed with the same potential. Please pay attention to the sufficient security.


When you set up the hi-fi system, there should be no other devices with (switching) power supplies or transformers in the immediate vicinity. But even the components themselves, which also contain their own power supplies, can influence each other negatively. See also the item “Position of the components”. Although most power supplies bear the CE mark, they are often inadequately equipped with the appropriate additional circuitry.

Device Error

If you do not get rid of the hum, there is still the possibility that there is a fault / defect inside the equipment. That is a case for the expert.

If there is a technical defect, I advise against a self-experiment. Hi-Fi systems are very complex. Many manufacturers require special skills in opening and repairing.