Audio reserch reference 3....driving Nagra VPA amp

The Nagra has input impedence an sensivity below:

Input sensitivity: 400mV for maximum power. Input impedance: 100k ohms

the reference 3' output below:
OUTPUT IMPEDANCE: 600 ohms Balanced, 300 ohms SE main (2), 20K ohms minimum load and 2000pF maximum capacitance

The Nagra has only Balanced in's and thats the way i want to drive them trough the reference 3, so basicaly 600 Ohms in balanced mode for the output.
I want to drive a pair of TAD horn speakers, 2 15" woofers with a compression loaded 2" horn.
Their Nominal impedence is 4 Ohm's and the sensivity rated at 98Db.

be careful, especially since you can't listen before buying

One of my friend used to own a pair of Nagra VPA 845 monoblocks driving a pair of Tannoy Westminster Royal SE's at 99db sensitivity driving 1 x 15 inch driver.

He found while the Nagra's were very nice, they could not really drive the Tannoy's properly and sold them a couple of years back.

YOur speakers with 2 x 25inch drivers may be a harder task to drive successfully.

The Nagra has unblanced inputs also. The earlier series only had balanced ins. I have a later set, and it has both balanced and unbalanced.

Wonderful amps.