I have a pair of Jamo D590s, these have a nominal impedance of 4 ohms, but does anyone have an impedance curve for these speakers? I want to know how kind they really are to the amplifier.
An impedance versus frequency graph would not tell the full story since the effective impedance can dip below the modulus (magnitude) of impedance shown on the graph.
Minima of 2 ohm at specific frequencies are common with 4 ohm nominal speakers, but a high quality amplifier designed for low impedance loads should not be troubled by that.
The technical explanation for this low effective impedance lies in EPDR as described in this article: https://www.stereophile.com/content/heavy-load-how-loudspeakers-torture-amplifiers-page-2
Elsewhere, member supernut supplied the attached image showing how the effective impedance, or EPDR, can fall below the modulus of impedance.
Minima of 2 ohm at specific frequencies are common with 4 ohm nominal speakers, but a high quality amplifier designed for low impedance loads should not be troubled by that.
The technical explanation for this low effective impedance lies in EPDR as described in this article: https://www.stereophile.com/content/heavy-load-how-loudspeakers-torture-amplifiers-page-2
Elsewhere, member supernut supplied the attached image showing how the effective impedance, or EPDR, can fall below the modulus of impedance.
Attachments
Here you go.
Maby also read
/John
