I think the sub looks super smart as it is, is the front black or chrome? I always liked the Burmester chromed amplifiers.
Keith
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Vera Audio midrange horn - polar measurements
- Thread starter Bjorn
- Start date
Keith
Now I am confused, I see polars which go from 100Hz to 20KHz in one go..The polars are measured separately. However, there's a measurement of both indoor over a reflective floor at different heights here:
Vera Audio midrange horn - polar measurements
Vera Audio is developing a horn speaker system. It consist of a midrange horn, a midbass horn and requires a bass/subwoofer solution. It will be active and offered with a separate high quality DSP. The 2-horn system look like the following: I'll show some measurements of the midrange/top...
Maybe its good to specify more exact what you are showing..
OP
- Thread Starter
- #63
Black glossy paint.
The plan is also to have the short sides veneered.
And we have moved away from a built in plate amplifier like the first prototype had.
The most powerful Hypex plateamp doesn't serve this subwoofer justice. It can take a lot more power. With an external mono block we will offer, it will have an increased output of 5 dB. That's almost as much as adding a second subwoofer. Avoiding either extra A/D or D/A conversion is nice too when you already have a DSP earlier in the signal path.
OP
- Thread Starter
- #64
Not sure what's unclear in that post. It isn't really a polar measurement. You have to wait for full anechoic measurements of the horn combined.
The graphs in post 3 is a measurement in a living room over a reflective floor of the horn speaker and subwoofer. Room looks like this (though speaker were placed differently and I used some more treatment):
It basically shows how even the 2-way horn speaker is in a living room with a reflective floor at various heights.
A complete overlay at different heights is seen here:
And in other graph below I removed the frequencies below 100 Hz, because room modes will obviously effect such an indoor measurement at different heights. What you seing above between 60 Hz and 80 Hz is room related. No gating were used in the measurement. Smoothing was with 1/3 octave in the overlay FIY.
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OP
- Thread Starter
- #65
A listening distance similar to what we see below would not work well for most speakers. The distance is 5.5 m (18') or greater depending on how much the couch and speakers are pulled out.
Despite of the long listening distance and close proximity to the rear wall, it works really well due to a combination of broadband and narrow directivity. This means the frequency response is still very even and there's not as much room interaction as with traditional speakers.
This is great benefit if one is forced to place seating position far away.
Having some absorption behind the listening position is an advantage though when sitting this close.
And typically, the lowest frequencies can be high when sitting close the rear wall and one has to bring the level down. But this is easy with a DSP that will be sold with speakers.
There's a bit of loss of depth, but other than that the sound quality and tonality is really great, and with a effortless and weight to the sound smaller systems simply can't match.
Despite of the long listening distance and close proximity to the rear wall, it works really well due to a combination of broadband and narrow directivity. This means the frequency response is still very even and there's not as much room interaction as with traditional speakers.
This is great benefit if one is forced to place seating position far away.
Having some absorption behind the listening position is an advantage though when sitting this close.
And typically, the lowest frequencies can be high when sitting close the rear wall and one has to bring the level down. But this is easy with a DSP that will be sold with speakers.
There's a bit of loss of depth, but other than that the sound quality and tonality is really great, and with a effortless and weight to the sound smaller systems simply can't match.
Maybe not perfect acoustically, but it looks like a great, very pleasant place to listen to music 
OP
- Thread Starter
- #68
Most of have experience with quality compression drivers would say the opposite here. There's a clarity and detail from a good compression driver that's not achievable with tradtional piston drivers. That's also my experience in AB testings and even when the compression driver isn't horn loaded.
I showed this measurement in another thread, and I'll post here as well. The horn used in this measurement isn't great, it hasn't been matched to the exit angle of the driver, and no EQ has been applied. But we can still see how fast the decay is for this compression driver - same one we're using in our horn.
Distortion with 95 dB is also very low despite the use of a non optimal horn.
Do you have to use a Be diaphragm compression driver to get such wide bandwidth with the midrange horn?
OP
- Thread Starter
- #70
No. I could us aluminum diaphragm as well. However, breakup is lower with beryllium and tends to sound smoother over time.
At the moment the crossover is at 530 Hz.
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