I am curious as to what you mean by timing issues with speakers. I can understand with electronic components but not with speakers. Is it lip sync you are referring to?
I meant time distortion,.....
I could not give the 10 series BS the benefit fo doubt sinc ethey had over 50hrs clocked on them.
Let me describe what I mean....(you can dition that and find it out yourself because I tried 2 new BS and then reverted back to 9.2 and 9.6 using the same source components)
If we look at a midrange driver and a tweeter, in the common vertical alignment in an enclosure, we have a time delay. The "acoustic centre" of the tweeter will most likely be a small distance closer to the listener than that of the midrange driver, and for the sake of this discussion, let us assume a difference of 50 mm, because it is a realistic and typical offset for common loudspeakers.
Before continuing, it is important that the concept of "wavelength" is properly understood. Sound travels at about 345 m/s in dry air at sea level. This changes with temperature, humidity and altitude, but we shall not concern ourselves with this, and there is little we can do about it most of the time. A sound at 345 Hz has a wavelength of 1 metre, at 34.5 Hz the wavelength is 10 metres, and at 3450 Hz, it is 100 mm. This is quite linear, and works for all frequencies. Another useful thing to know is the period (the actual time required to reproduce one cycle at the selected frequency).
wavelength = velocity / frequency
period = 1 / frequency
From the above, we can calculate the wavelength for any frequency we like. 3000 Hz has a wavelength of 115 mm, for example.
If we return to the midrange and tweeter mentioned above, their acoustic centres are offset by 50 mm - this is exactly 1/2 wavelength if the crossover frequency is 3450 Hz. We can account for the 1/2 wavelength by reversing the wires to the tweeter, so it is 180 out of phase with the midrange. The two drivers are now aligned in phase, so in theory, they are time aligned. Unfortunately, this is not the case. Although the signal is in alignment at the crossover frequency, it will not be aligned any more when the frequency changes.
What is really needed is to delay the signal going to the tweeter by 145 us (1/2 of the period of a 3450 Hz waveform), or align the acoustic centres of the two drivers in the vertical plane. Such "time alignment" is commonly achieved by angling the baffle so that at the listening position, the signals are properly in phase and time.
Simply put the 10 series IMHO some problems with the design cues - I believe using the back port of the BS is flawed - Wharf trying to build something better over the 9.2 (obviously from feedback that they could do even better with better bass) tried the back porting. Seriously many may liek the sound - I just belive if you want more bass go get a sub or get a decent FS
