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Old 02-22-2023, 03:51 PM
Clark2 Clark2 is offline
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Join Date: Feb 2019
Location: Washington, DC, and vicinity, USA
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Default Sennheiser Momentum 4 -- How Does they Work?

This may seem pretty low-brow, considering the audience, but I'm in need of new noise-cancelling headphones, both for general use and for aircraft travel. The phones named above sound quite good, except for too much very low bass, which both gives music an unnatural balance and can cause distortion at higher frequencies in dense orchestral music, when present in the source. (Don't get me wrong. This very low bass is not typical of modestly priced headphones and sounds good, tight and musical; there's just too much of it.)

The excess low bass can be tamed with a built-in equalizer (controlled through a smart-phone app), but user-specified equalization only applies to digital sources (Bluetooth or USB) and is unavailable on wired audio inputs for unknown reasons. Hence my question about how they work.

Wired audio input will play with the phones powered off, but it sounds terrible. Powering them on solves this problem, apparently through internally specified equalization. But how is this equalization achieved? If there's an internal ADC for analog inputs (to replace a digital source), feeding a DSP module (that performs the equalization), then on to the DAC (feeding the amplifiers and electro-acoustic drivers), then why not save the app-generated equalization settings and apply them to analog inputs as well?

On the other hand, is it conceivable that there could be some kind of analog equalization that can run with analog sources but is not programmable by the user?

Many questions and no answers from Sennheiser. -- Clark2
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