May be a silly question but is the 2 Ohms specified as the DC resistance of the primary? If so the impedance at audio frequency will be significantly higher.
From memory most mixing desks try to present a 600 Ohm impedance for microphones. The transformer in these tend to have a primary resistance of about 20 Ohms and secondaries between 2k and 3k so the 2 Ohms looks very very low. Might be worth measuring to double check.
Normally the input impedance of an audio transformer is determined by the load on the secondary (normally 47k, 68k or 100k depending on the phono stage) divided by the square of the ratio (100 for a 1:10) which would give you input impedances of 470 Ohms, 680 Ohms or 1k Ohms. You may also need to add a cap/ resistor combination on the secondary output to avoid overshoot.
Have a look at this page to give you more background info:-http://www.rothwellaudioproducts.co.uk/ ... xplai.html