3" driver for CBT array? |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Beyma: Green
Faital Pro: Torques Best Regards,
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Elliot Thompson
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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manufacturer spec sheets show very similar sensitivity - so bit surprised by the clear difference.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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It is difficult to make
a comparison amongst Beyma and Faital Pro examining the
manufacturer's specification sheet. The differential in dB range vs
Frequency Range do not coincide on their specification sheets upon viewing the dB increments. The
Faital Pro hovers overall below 90 dB throughout of the majority
of the bandwidth (10 dB increments) whereas, the Beyma appears to be
undetermined from a dB range throughout the majority of its frequency
range due to following an unconventional increment dB scale. With
your chart, at least we can see the behavioural pattern at the given
frequencies amongst both drivers @ 5 dB increments. Best Regards, Edited by Elliot Thompson - 18 February 2020 at 8:18pm |
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Elliot Thompson
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Elliot, Does that verbose post really just say the beyma looks better? :)
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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This is what I am seeing... Based on the graph, we can see the Beyma 3 FR30 offers around +3 dB over the Faital Pro 3 FE25 within the 180 Hz - 2 kHz range. With the exception of 3 kHz (in favour of the Beyma 3 FR 30 by around +7 dB) the performance is very close from 4 kHz - 12 kHz (not very noticeable from an audible standpoint) between the Beyma 3 FR30 and Faital Pro 3 FE25 loudspeakers. Above 12 kHz, the Beyma offers +5dB within 14 kHz - 15 kHz range and both drivers begin to take a nose dive around 18 kHz.
So pretty much what Snowflake stated in terms of the Highs, Mids and, Bass on what he is hearing is displayed on the REW Plot.
We are at a stage that there are so many 3 inch full-range drivers at our disposal that, there is no need to settle for a full-range loudspeaker that will not meet our requirements.
Best Regards, |
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Elliot Thompson
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Think i might get a few beymas to play with when my workshop is finished and i have the time and a place to mess about with a few cabinets. Really like the idea of a suitcase sized rig able to do a small venue. Was also looking at tony wilkes q25 reprise thread. Although the pictures are gone, the 5 inch coaxial and a second 5 inch driver must be a punchy combination in a bookshelf speaker sized package.
The cost and simplicity of a line of three inch drivers has an appeal though!
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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putting the order in today for fifteen beyma drivers. managed to work out all the frequency shading with the use of just one 5W resistor. this prototype will be 1.2m long. beamwidth and pattern control can be altered by changing the curvurture of the line (it should be flexible engough to play around with this.). BTW would anyone consider using a CBT as a stage monitor? I have an idea for one that would be just 60cm tall, 10cm wide. with 70degree vertical beamwidth and pattern control to 80Hz.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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well I haven't got the drivers yet. three week wait for the Beymas so might just get the Faitals to do a prototype with. also, what's going on with the big dip in my Beyma measurement at 5kHz? it isn't present in the plot on manufacturers spec sheet. maybe a measurement error from reflections? but why isn't it also on the faital plot? If it ever stops raining and blowing will try to measure again outdoors.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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You can measure them indoors with the microphone very close to the cone at a lower level. That will reduce any reflections taking place during the test measuring in the kitchen. I usually place the loudspeaker on a throw pillow to eliminate any reflections from a flat surface such as a table. Best Regards, |
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Elliot Thompson
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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just measured again with the mic 2" from the cone. 5kHz dip is still there
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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it really doesn't look to me like a measuring environment problem - the beyma and faital are giving respones that are almost the inverse of each other from 3kHz up - where one has peak the other has a dip.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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low frequency response. this nearfiled measurement is very different to the previous measurement below 400Hz - room response was dominating before. the faital has a lower fs (110Hz vs 160Hz) and a higher Qts (0,7 vs 0.49). on an open baffle, I think this will make up for a some of its lower xmax and power handling - is that right? haven't really decided where to high pass these yet.
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