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I chose the UP receiver for my future cShell. Does it matter much acoustically if I choose the standard (for UP) HF4 filter over the HF3? The HF3 is theoretically better, but larger.
I am aware that physical constraints are possible, because HF3 is ~3mm diameter and HF4 is 2.2mm.
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I have the F3 with the UP receiver and a Cshell ear mold. I think that they only recommend the F4 for smaller ear molds that can’t fit the larger F3.
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I think that they only recommend the F4 for smaller ear molds that can’t fit the larger F3.
On the Polish order form it is written that the standard option for UP receiver is HF4.
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As a curiosity, I insert an analysis from Gemini (Deep Thinking). Not all is correct, for example it suggests that Cerustop can’t be used in custom earmolds, which isn’t true:
Hearing Aid Filter Acoustic Comparison.pdf (163.4 KB)
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On my copy of the guide, it only states that Cerustop are not to be used with UP receivers in Cshell ear molds.. something that my audiologist apparently didn’t know, which is how they were delivered to me initially. I’m sure either will work.
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It says right on the guide that H3 is recommended for UP receivers.
You’re right, but guide is from 2022 and according to recent order form the standard is HF4:
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Finally I decided not to overcomplicate things and has chosen standard HF4.
It’s because it’s a bit of improvement compared to Cerustop and I don’t want my cShell to be shorter and shallower in ear canal due to physical constraints.
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