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Resound Surefit 3 Receivers Nexia/Jaba EP20

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I was fitted with Jabra EP 20’s with #2MP receivers. Later I bought a used set of Jabra EP 20’s that came with #3HP receivers. I ordered a set of #2MP receivers to replace the #3HP’s. When I replaced the receivers I was surprised that the MP’s where louder than the HP’s. From what I read the LP, MP & HP stood for (LP low power) (MP medium power) & (HP high power). So I was surprised that the new #2MP’s where louder than the #3HP’s. Could this be that the #2MP’s where new and the #3HP’s where old? Or could it be that the #3HP’s being longer sat farther back behind my ears and the microphone did not pick up the front sound as well as the shorter #2MP? Or could it be that the HP’s focused on the High Frequencies and the MP’s focused on the Mid Range Freq’s that I have set higher gains?

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No the original fitting was for HP and when you added the MP it was saturated, yeah you must reprogram the to suit the receiver,so it’s not the receiver that determines output/gain but the HAs fitting.

I did a complete new reprogram for the MP’s and the gain levels are lower than what I had on the HP’s. I started to duplicate the HP settings but it became apparent very quickly that the levels are louder with the MP’s.

@RedMed said:

I started to duplicate the HP settings but it became apparent very quickly that the levels are louder with the MP’s

Yes the gain should be louder on the MP then the HP, but obviously your not going to get exact same gains with different power levels in the receiver, i wouldn’t copy HP for the MP, no sense in doing that, but let the formula work out what’s required, so the gain should be louder if you copy the gain levels of the HP to MP that makes sense to me anyway, so just to confirm that in fitting your doing, your using the same client and formula and just changing the receiver in acoustics set up right, nothing else.

Actually I set the 2MP up as a new client with the same . Both as experienced but the formula of the 3HP was and later realized I forgot change the formula of the 2MP from the default audiogram +. Which even surprised me more because I’d expect NAL-NL2 to be more aggressive than audiogram +. Plus the gain settings of the 2MP where not as high as the gain settings on the 3HP. When I started to duplicate the induvial gain numbers of the HP it quickly became apparent that I had to reduce the gains. So that is what surprised me was two elements, lower gain amounts and a less aggressive formula. I expected the result to be a lower volume level. Previously when working on the 3HP I changed from audiogram + to NAL-NL2 to gain more volume from the 3HP. So my original intent was to to pretty much clone the settings of 3HP and drop the gain levels. Instead the end result was the opposite of what I expected.

The HP and MP descriptors for the receivers is nothing to do with gain or sensitivity, it’s the maximum power handling (or as it’s usually called in heating aid land) that is different. The HP receiver goes louder than the MP receiver and the SureFit software knows what signal to apply to the receiver to get the desired output. If you change the receiver without changing the setting in the software then the “loudness” will be wrong.

What you found is what I would have predicted, so not odd at all.

Edited
@david.hendon said:

If you change the receiver without changing the setting in the software then the “loudness” will be wrong.

With the Resound hearing aid, You can not change the receivers without reprogramming … the aids will just continue to play a musical tone and not work. The aids know you have changed them.
With Phonak (with Luminity and previous models, I don’t know about the Infinity) you can change and the volume will me greater when going from M to P receivers.

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