A DI will work. But, if you have line level equipment, you can just lower the level with a resistor and a buffer, then, if you want differential outputs, you can add an inverter or a THAT IC solution. All of that will probably be less expensive than a good transformer.but the di-box is not used for higher impedances?
Is it a good solution to convert a line signal to mic?
"Bridging" input terminations are generally considered 10x the nominal 150-200 ohm mic source impedance so 1.5k to 2k ohm.Mic input amplifiers usually have a minimum of around 1K input impedance (5 times a nominal 200 Ohm mic OUTPUT impedance to reduce losses) . The original question is too vague to give a definitive answer, such as what the source impedance really is, whether the mic amp is a typical 1K or more INPUT impedance and whether galvanic isolation (transformer) would be a benefit (reduces chance of ground current induced hum) and whether being balance/is also an advantage.
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