Comparing two Bose headphones, both of which use active technology.

In this posting I’m going to do something I rarely do, which is, something like a product review. I have purchased the following two headphones within the past few months:

  1. Bose QuietComfort 25 Noise Cancelling
  2. Bose AE2 SoundLink

The first set of headphones has an analog 3.5mm stereo input cable, which has a dual-purpose Mike / Headphone Jack, and comes either compatible with Samsung, or with Apple phones, while the second uses Bluetooth to connect to either brand of phone. I should add that the phone I use with either set of headphones is a Samsung Galaxy S9, which supports Bluetooth 5.

The first set of headphones requires a single, AAA alkaline battery to work properly. And this not only fuels its active noise cancelling, but also an equalizer chip that has become standard with many similar middle-price-range headphones. The second has a built-in rechargeable Lithium-Ion Battery, which is rumoured to be good for 10-15 hours of play-time, which I have not yet tested. Like the first, the second has an equalizer chip, but no active noise cancellation.

I think that right off the bat I should point out, that I don’t approve of this use of an equalizer chip, effectively, to compensate for the sound oddities of the internal voice-coils. I think that more properly, the voice-coils should be designed to deliver the best frequency response possible, by themselves. But the reality in the year 2019 is, that many headphones come with an internal equalizer chip instead.

What I’ve found is that the first set of headphones, while having excellent noise cancellation, has two main drawbacks:

  • The jack into which the analog cable fits, is poorly designed, and can cause bad connections,
  • The single, AAA battery can only deliver a voltage of 1.5V, and if the actual voltage is any lower, either because a Ni-MH battery was used in place of an alkaline cell, or, because the battery is just plain low, the low-voltage equalizer chip will no longer work fully, resulting in sound that reveals the deficiencies in the voice-coil.

The second set of headphones overcomes both these limitations, and I fully expect that its equalizer chips will have uniform behaviour, that my ears will be able to adjust to in the long term, even when I use them for hours or days. Also, I’d tend to say that the way the equalizer arrangement worked in the first set of headphones, was not complete in fulfilling its job, even when the battery was fully charged. Therefore, If I only had the money to buy one of the headphones, I’d choose the second set, which I just received today.

But, having said that, I should also add that I have two 12,000BTU air conditioners running in the Summer months, which really require the noise-cancellation of the first set of headphones, that the second set does not provide.

Also, I have an observation of why the EQ chip in the second set of headphones may work better than the similarly purposed chip in the first set…

(Updated 9/28/2019, 19h05 … )

Continue reading Comparing two Bose headphones, both of which use active technology.

Is it valid that audio equipment from the 1970s sound better than modern equipment?

I’ve written about this before.

That depends on which piece of audio equipment from the 1970s, is being compared with which piece of equipment from today.

If the equipment consists of a top-quality turntable from the late 1970s, compared to the most basic MP3-player from today, and if we assume for the moment that the type of sound file which is being played on the Portable Audio Player, is in fact an MP3 File recorded at a bit-rate of 128kbps, then the answer would be Yes. Top-quality turntables from the late 1970s were able to outperform that.

OTOH, If the audio equipment from today is a Digital Audio Player, that boasts 24-bit sound, that only happens to be able to play MP3 Files, but that is in fact playing a FLAC File, then it becomes very difficult for even the better audio equipment from the 1970s to match that.

Top-Quality Audio Equipment from the late 1970s, would have cost over $1000 for one component, without taking into account, how many dollars that would have been equivalent to today. The type of Digital Audio Player I described cost me C$ 140.- plus shipping, plus handling, in 2018.

Also, there is a major distinction, between any sort of equipment which is only meant to reproduce an Electronic signal, and equipment which is Electromechanical in nature, including speakers, headphones, phonographs… ‘The old Electromechanical technology’ was very good, except for the basic limitation, that they could not design good bass-reflex speakers, which require computers to design well. With no bass-reflex speakers, the older generations tended to listen to stereo on bigger, expensive speakers. But their sound was good, with even bass.

Continue reading Is it valid that audio equipment from the 1970s sound better than modern equipment?

There exists HD Radio.

In Canada and the USA, a relatively recent practice in FM radio has been, to piggy-back a digital audio stream, onto the carriers of some existing, analog radio carriers. This is referred to as “HD Radio”. A receiver as good as the broadcasting standard should cost slightly more than $200. This additional content isn’t audible to people who have standard, analog receivers, but can be decoded by people who have the capable receivers. I like to try evaluating how well certain ‘Codecs’ work, which is an acronym for “Compressor-Decompressor”. Obviously, the digital audio has been compressed, so that it will take up a narrower range of radio-frequencies than it offers audio-frequencies. In certain cases, either a poor choice, or an outdated choice of a Codec in itself, can leave the sound-quality injured.

There was an earlier blog posting, in which I described the European Standard for ‘DAB’ this way. That uses ‘MPEG-1, Layer 2′ compression (:1). The main difference between ‘DAB’ and ‘HD Radio’ is the fact that, with ‘DAB’ or ‘DAB+’, a separate band of VHF frequencies is being used, while ‘HD Radio’ uses existing radio stations and therefore the existing band of frequencies.

The Codec used in HD Radio is proprietary, and is owned by a company named ‘iBiquity’. Some providers may reject the format, over an unwillingness to enter a contractual relationship with one commercial undertaking. But what is written is, that The Codec used here resembles AAC. One of the things which I will not do, is to provide my opinion about a lossy audio Codec, without ever having listened to it. Apple and iTunes have been working with AAC for many years, but I’ve neither owned an iPhone, nor an OS/X computer.

What I’ve done in recent days was to buy an HD Radio -capable Receiver, and this provides me with my first hands-on experience with this family of Codecs. Obviously, when trying to assess the levels of quality for FM radio, I use my headphones and not the speakers in my echoic computer-room. But, it can sometimes be more relaxing to play the radio over the speakers, despite the loss of quality that takes place, whenever I do so. (:2)

What I find is that the quality of HD Radio is better than that of analog, FM radio, but still not as good as that of lossless, 44.1kHz audio (such as, with actual Audio CDs). Yet, because we know that this Codec is lossy, that last part is to be expected.

(Updated 8/01/2019, 19h00 … )

Continue reading There exists HD Radio.