THE ROLE AUDIO
There was a little inconsistency between the pair but not much.
This one, of the two, looked pretty good. It may have a little choppiness to it but it stays within a 2db range. This is easily better than most speakers.
The spectral decay is pretty clean but there are a few small resonances up and down the graph.
Horizontal off axis looks pretty good too.
The vertical off axis shows some cancellation going on around the crossover point. Since it is a small woofer I would guess from the measurements that it is a fairly high crossover point near the 5.5kHz range.
Dropping the mic down to the woofer axis shows minimal change. In fact the drivers might be more in phase this way than on the tweeter axis. This is one that might sound better if it were flipped over upside down because it might give you a more even room response this way.
The impedance is extremely high on the tweeter end. Different amps will handle the impedance mis-match differently and this could easily change the tonal balance on some amps. We can also see that this is a sealed box. Coupled with a small woofer it may not have much low end output or power handling.
Here is the effect of adding the grill.
The pair was fairly consistent.
On axis response looks good too.
Spectral decay is very clean, much cleaner than the norm.
Horizontal off axis looks great too. Off axis response is even across the board.
Vertical off axis response lets you know very quickly that you need to be on axis while listening to these. Off axis no more than 4" is fine but from 8" and 12" there is significant cancellation of the drivers. This is a direct result of the high crossover point that was reported to be in the 4.5kHz range.
Impedance between the woofers and the tweeter are a bit of a mismatch. While the impedance of the woofers is fairly high, the impedance on the tweeter end dips to 3.8 ohms.
The consistency in the responses of the two speakers sent were outstanding by any standards and one of the best of the group.
Here is an individual response.
The cumulative spectral decay was also one of the cleanest of any in the group and well above the norm.
Horizontal off axis is very good also with just a slight peaked area just below 3kHz when off more then 30 to 40 degrees.
Vertical off axis looks incredibly good and only has a slight change in response even in the extreme off vertical off axis. The slight dipped area in the extreme off axis also mirrors the same area where there is a slight rise in the horizontal off axis. So total in room response should be pretty flat.
The impedance is a pretty easy load across the board too and only dips to 6.2 ohms at the tweeter end. Tuning frequency shows to be in the 44Hz range.
From previous work on this speaker I know that the crossover point is in the 1.6kHz range.
This was one of the closest matched pairs of all that were sent and well above industry standards.
The total response was really smooth.
The spectral decay was also one of the cleanest of all the speakers that were sent and exceptional by any standards.
The horizontal off axis looks great. 10 degrees off axis looks as good as the on axis response.
It has a slightly peaked area in the to 3kHz range when off axis more than 20 degrees, but not bad.
The vertical off axis looks exceptionally good. Even though it is a ribbon tweeter it still has good vertical off axis
and does show any significant drops until 12" above tweeter level (from 1 meter away).
Impedance looks great showing a minimal dip in the upper range of only 5.7 ohms. Tuning frequency is at 55Hz.
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