BTE vs. RIC - General difference?

[PeterH]

I find better results with BTE than RIC 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 Audiogram as minimum fitting.

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

It also gave me backache, that was a heavy amp

[Bimodal_user]

@PeterH

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.

MPO: A Forgotten Parameter in Hearing Aid Fitting

[PeterH]

@Bimodal_user

Perhaps it’s because of higher possible MPO.

It very well could be. But in all these cases, the “Target” MPOs are similar. All very strange.

[Bimodal_user]

Isn’t Naida UP a special model, which has double receiver? I don’t remember.

[PeterH]

Interesting article. I do believe this explains what I’m experiencing. It’s like the UPs just have more headroom

[PeterH]

@Bimodal_user

Isn’t Naida UP a special model, which has double receiver? I don’t remember.

Mine are Sky Naida L70 UP. They use the 675s, but just are Ultra Power rather than SP (Super Power) that use 13s. They are big and BTE

[Um_bongo]

The biggest UP either use the CI 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.

[Bimodal_user]

@Um_bongo

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

CI receiver? (20 characters)

[Um_bongo]

This: CI Series

[Bimodal_user]

Thanks, very interesting.

@Um_bongo

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?