Here is a summary of whether you can use a 4-ohm speaker with an 8-ohm amplifier:
Overview
- It is generally not recommended to use a 4-ohm speaker with an 8-ohm amplifier. However, it may be possible in some cases depending on the amp’s capabilities.
Potential Issues
- The lower impedance of the 4-ohm speaker will draw more current from the amp. This can potentially overload and damage the amp if it lacks sufficient current delivery capability[1][2].
- Even if the amp can handle the extra current draw, it may go into clipping or distortion at high volumes when trying to drive more power into the 4-ohm load[3].
- Impedance dips in the speaker over the frequency range could drop the load below 4 ohms, further stressing the amp[4].
When It May Work
- High-end receivers and power amps with robust power supplies and cooling can often safely handle 4-ohm loads[4].
- Using high-efficiency 4-ohm speakers reduces the current demands on the amp vs. low-efficiency models[4].
- Keeping volume at reasonable levels reduces the chances of overloading the amp when using a 4-ohm speaker[1].
- Check the manufacturer specs – some amps list 4-ohm compatibility despite being rated for 8 ohms[5].
Best Practice
- Match the speaker impedance to the amp’s rating to avoid issues and get optimal performance. If the amp is 8 ohms, use 8-ohm speakers[6].
- When in doubt, contact the manufacturer about 4-ohm speaker compatibility. Don’t risk damaging expensive equipment.
So in summary, it’s generally better to match impedances, but some amps can handle 4-ohm speakers safely if care is taken. Check compatibility to be sure.
Citations:
[1] https://audiokarma.org/forums/index.php
[2] https://electronics.stackexchange.com/questions/374901/what-is-the-danger-in-plugging-an-4-ohm-speaker-into-an-8-ohm-amplifier
[3] https://youtube.com/watch?v=j8liG1nLfcY&t=0
[4] https://www.audioholics.com/frequent-questions/connecting-4-ohm-speakers-to-an-8-ohm-receiver-or-amplifier
[5] https://arendalsound.com/guide/4-ohm-speakers-with-8-ohm-amplifier/
[6] https://www.reddit.com/r/audio/comments/100veuj/can_you_pair_4ohm_speakers_with_8ohm_amp/