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Adding impedance to iems, how does the sound change, if at all?

post #1 of 2
Thread Starter 

Just thinking about the Etymotic er-4B versus er-4p, I went out and bought a 30-ohm impedance adaptor for a few bucks and a laugh.

 

What should I expect in terms of sound changes, if any for:

 

1. iems with a single dynamic driver?

 

2. iems with a single BA (like the er-4)?

 

3. iems with multiple BAs or BA-dynamic hybrids?

 

 

Thanks!

post #2 of 2

The biggest difference will be in the frequency response.

 

Take a look at the SE535 impedance curve. It starts out flat, rises until about 1.5 kHz, drops to a low point at 6 kHz and rises again.

 

If you add resistance, or your amps has high output impedance to begin with, the frequency response will be changed accordingly. It should be about +2 dB at 1.5 kHz and -5 dB at 6 kHz..

 

If all of that is cryptic to you: with the SE535, the mids will be a bit louder, and upper mids/lower treble will be quite a bit quieter.

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