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BTE vs. RIC - General difference?

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I find better results with than however, the fittings are different:

RIC M P90 with 1.9mm vent Slimtips

BTE L90 SP with deep mould (3mm vent)

BTE L70 UP with identical mould as above

The Lumity UP performs massively better than the other two, especially with music.

Does a BTE UP use a bigger speaker than as BTE SP? Apart from that, I can’t understand why. All 3 pairs of aids are well within my fitting range. In fact, the UPs almost follow my as minimum fitting.

For reference, this is the exact piece of equipment that made me as deaf as I am:

20251009_232358

It also gave me backache, that was a heavy amp :grinning_face:

@PeterH said:

The Lumity UP performs massively better than the other two, especially with music.

Does a BTE UP use a bigger speaker than as BTE SP? Apart from that, I can’t understand why. All 3 pairs of aids are well within my fitting range. In fact, the UPs almost follow my Audiogram as minimum fitting.

Perhaps it’s because of higher possible .

MPO: A Forgotten Parameter in Hearing Aid Fitting8

It is important to select a hearing aid with a sufficiently high MPO such that the desired gain plus the input levels would not be limited by the MPO. The same considerations should also be applied to setting the MPO on a hearing aid in order to...

The biggest UP either use the receiver or the back to back double receivers from Knowles.

Even 30 years ago the packages could put out nearly 140dB with an acceptable level of distortion. Advances like ferrofluid damping and materials changes/refinements will probably allow better responses with less distortion, but in other aspects the absolute power is limited by the physical size and maximum properties of the components. If there’s greater voltage on tap due to oscillation splitting it helps too.

The biggest issue with these aids is trying to stop the capsule from ‘waggling’ at high drive levels and transferring that vibration to the mics in the case.

Thanks, very interesting.

@Um_bongo said:

If there’s greater voltage on tap due to oscillation splitting it helps too.

So, it’s another cause of 3.7V rechargeables instead of 1.45V zinc-air disposables?

In reply to @Baltazard

I’ve have profound hearing loss in my left ear (nerve damage). I recently switched from to because it’s more powerful. The technology has also changed. With a custom ear mould, I do not receive any feedback.

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