Bass reflex systems have been discussed ad infinitum but speakers systems have changed. Yes, a port offers bass extension but like I said: speakers systems have changed. In its most basic definition a port offers +3dB at whatever frequency you desire.
I'm one of those consumers who have replaced home theatre satellites with 'real' speakers. For example one of my AV amplifiers has a relatively high (160hz) crossover point. The connected fronts are Sony bookshelf speakers with a 5" ported bass driver. There are a couple of phenomena that I struggle to understand, (1) blocking the port reduces SPL (even though the port is tuned to a frequency the cabinet never receives). (2) The port remains 'active'. Even at high volume levels the satellite bass driver exhibits no movement discernible to the naked eye. However, the port remains active, moving air.
It's a ridiculous question: where do you tune the port on a satellite speaker?
I'm one of those consumers who have replaced home theatre satellites with 'real' speakers. For example one of my AV amplifiers has a relatively high (160hz) crossover point. The connected fronts are Sony bookshelf speakers with a 5" ported bass driver. There are a couple of phenomena that I struggle to understand, (1) blocking the port reduces SPL (even though the port is tuned to a frequency the cabinet never receives). (2) The port remains 'active'. Even at high volume levels the satellite bass driver exhibits no movement discernible to the naked eye. However, the port remains active, moving air.
It's a ridiculous question: where do you tune the port on a satellite speaker?
Speaker port doesn't "offers +3dB at whatever frequency you desire" - it simply extends woofer frequency response toward low frequencies, efficiency stays the same.
1) Blocking the port doesn't reduce SPL, but it may reduce possibilities for high SPL at low frequencies if pushed hard by the amplifier.
2) The port always remain active, even if the cone moves very little. In fact, minimum cone motion at particular frequency indicate where the port output is maximum.
There is no need to de-tune a satellite loudspeaker - it performs the best as it is designed for.
1) Blocking the port doesn't reduce SPL, but it may reduce possibilities for high SPL at low frequencies if pushed hard by the amplifier.
2) The port always remain active, even if the cone moves very little. In fact, minimum cone motion at particular frequency indicate where the port output is maximum.
There is no need to de-tune a satellite loudspeaker - it performs the best as it is designed for.
I have to wonder if you're literally deaf or you've never owned a pair of speakers. I'm going to guess that you're a car audio enthusiast and are clueless as to the finer points.
All things being equal, a speaker driver has two outputs, front and back. A resonator is another conversation but reflex technology is concerned with capturing the an in phase portion of 3dB output emanating from the rear of the driver. In addition the resonator there is always 'sound' emanating from the port. If you can't hear the difference between a sealed and a ported woofer, particularly in a 2-way system you should consult an ENT specialist.
OK, I think that kind of attitude problem will ensure nobody else bothers posting here.
