View Full Version : Amp impedance setting for use with Compact 7 ES2

30-06-2010, 01:39 PM
Apologies in advance if this is a repeat question.

I am using a Leben CS300 amp with my compact 7ES2 speakers. The amp has the option to be set to 4, 6 and 8 Ohms.

What should I set it to for use with CS7ES2 - 6 or 8?

I have read the impedance of the speakers is 6-8 ohms. Is this correct?

30-06-2010, 04:05 PM
I have a similiar amplifier as yours; have set it to 6 ohms as I've strictly adhere to the SHL5 specification. btw, have you tried different setting? have tried fiddling with the different setting, but not much diff

anyway, don't have much time to fiddle with the setting hence stick to 6 ohms. it sounds nice.

is the setting of 4, 6, 8 ohms to match the impedance seen by the amplifier output for high impedance?

01-07-2010, 02:00 AM
When Martin Colloms measured the C7ES's (version prior to the 2's) for HFN&RR he classed them as 6ohm - the impedance dipped to a minimum of 4.7 ohms at 350Hz, but the curve is quite gentle. Colloms rated the ease of drive as 'average'.

{Moderator's comment: You are referring to the earlier C7ES2, but the C7ES3 has a similar easy curve.}

John Geisen
01-07-2010, 02:32 AM
6 is more correct but I'd try both and see which setting you prefer.


17-10-2010, 11:01 PM
My amplifer (Dynaco ST70 II) can be set to 4,8,16 ohm. Between 4 and 8 I prefer the second,I think it sounds better.