Greetings all,
Listening to the SSB voice on ham radio may be an unpleasant experience due to the speakers used (small, inefficient), their mounting (up or side firing), amplifiers with higher (10%) distortion, and the like, even in better transceivers. Although most transceiver include phone output, I do not like using phones for various reasons. Interestingly, some of the new higher tier - and price transceivers now include option to add (multiple) speakers with a rathr sophisticated processing.
That made me start to think about adding external speakers.
The SSB audio bandwidth is about 300 Hz to 3300 Hz, but adjustable filters are used to (usually) narrow the bandwidth, but sometimes the filters are used to shift the lower and/or higher edge, e.g. to avoid close signal. Thus the speaker should cover the bandwidth from 250 Hz to 3600 Hz with excellent intelligibility.
The speakers should have high efficiency so that a battery operated, and such small and low noise amplifier, could be used.
Although I do not think that a low distortion would be difficult to achieve, for the sake of completeness, I am adding this requirement so that the already distorted signal by, e.g., narrow filter settings, noise, etc. is not degraded further.
I was initially contemplating a single-driver speaker, but then I though that I will also be using the speakers for casual music or speech listening, so perhaps a two-way would be better choice. I was contemplated a wave-guide loaded tweeter (higher efficiency, better focus), either off-the shelf or using one aguerpro’s wave-guides from the "Open source Waveguides for CNC & 3D printing!" thread, mated to a low distortion mid-range/woofer.
So, if you could point me to some designs/kits, I would appreciate it.
Kindest regards,
M
Listening to the SSB voice on ham radio may be an unpleasant experience due to the speakers used (small, inefficient), their mounting (up or side firing), amplifiers with higher (10%) distortion, and the like, even in better transceivers. Although most transceiver include phone output, I do not like using phones for various reasons. Interestingly, some of the new higher tier - and price transceivers now include option to add (multiple) speakers with a rathr sophisticated processing.
That made me start to think about adding external speakers.
The SSB audio bandwidth is about 300 Hz to 3300 Hz, but adjustable filters are used to (usually) narrow the bandwidth, but sometimes the filters are used to shift the lower and/or higher edge, e.g. to avoid close signal. Thus the speaker should cover the bandwidth from 250 Hz to 3600 Hz with excellent intelligibility.
The speakers should have high efficiency so that a battery operated, and such small and low noise amplifier, could be used.
Although I do not think that a low distortion would be difficult to achieve, for the sake of completeness, I am adding this requirement so that the already distorted signal by, e.g., narrow filter settings, noise, etc. is not degraded further.
I was initially contemplating a single-driver speaker, but then I though that I will also be using the speakers for casual music or speech listening, so perhaps a two-way would be better choice. I was contemplated a wave-guide loaded tweeter (higher efficiency, better focus), either off-the shelf or using one aguerpro’s wave-guides from the "Open source Waveguides for CNC & 3D printing!" thread, mated to a low distortion mid-range/woofer.
So, if you could point me to some designs/kits, I would appreciate it.
Kindest regards,
M