Advantages of a standard 2-way reflex vs coaxial |
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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My thinking is that not being able to freely taior hf dispersion and lf extension to your potential needs when designing the speaker would be one thing to consider, you will effectivly be locked into the hf/lf system properties as it where, on the other hand, if what ever is given in that regard works for you then fine, I would assume that a coax is a great choise in many aspects.
How would you say that the true pointsource characteristics of a carefully processed coax comes through with regards to soundquality? And is this a real world significant advantage compared to more traditional 2-way approaches?
Edited by martinsson - 27 February 2021 at 6:44am |
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Swedish Pro-fi diy-nerd - http://www.martinsson.cc/blog/
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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There are many coaxials with HF flares to chose from.
So controlling dispersion is not a problem.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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Most of which suffer from significant colouration from reflections and refraction from the waveguide directly infront of the low/mid cone. BMS try to negate this with absorbent material on the back side of the HF waveguide but it is still there. The only unit i have heard that works well, to a point, is the BMS tri-ax which can use a lower x over between the low and mid device.
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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I-shen Soundboy
Registered User Joined: 21 December 2016 Location: Big Smoke Status: Offline Points: 375 |
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There is the possibility of using a coax inside a waveguide to control dispersion, although usual horn rules apply so not perfect.
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APC321
Young Croc Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 680 |
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Thats an interesting idea. I have a pair of Beyma 12xm (spec. below): https://ibb.co/vcvNy4c The hf on these drivers is so efficient that it has to be padded down by perhaps 8dB on the passive crossover for the driver (max. attenuation available), and I find that the hf is still too loud. So the system eq. has to be attenuated above the crossover point (1.6K) to compensate. Maybe the driver could be mounted in a box with a front horn on it (a bit like a small version of a jbl 4560) to increase the efficiency of the 12" driver? Would make an efficient, reasonably compact point source mid- top box? |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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800Hz crossover point. |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Zeno
Registered User Joined: 03 February 2015 Location: MUC Status: Offline Points: 28 |
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I used to have Tannoy Dual Concentric speakers for my cabinets, brilliant. However, these could no longer deliver the required, increasingly extreme levels without having to be reconed after one night. That's why, when the BMS Coaxial driver came out, I switched to a Triax system. Here I can go up to 700 Hz with the crossover frequency. This is possible because I use the speaker grille as a back for the horn. The horn itself remains completely free. For bass I use the PAS 2580C. Despite the small cabinet, it is possible to achieve a massive bass foundation. For the most of the indoor applications I have, I would definitely not want to do without the point source. In addition, it is often advantageous not to have to place a bass on the floor. This avoids the transmission of low frequencies to the residents.
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fat_brstd
Old Croc Joined: 23 August 2008 Location: Melbourne, OZ Status: Offline Points: 2125 |
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The Martin Audio drivers from the CDD range are really good examples of decent coax driver, I think they sound great but good luck getting any for DIY use.
The coax drivers I have always had problems with are the ones with horns for the CD in front of the paper cone like the post above, there are always issues at crossover points with those types of coax where the horn wont load low enough to cover the bit that the woofer wont go high enough to cover because the horn is in the way. |
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madam
Registered User Joined: 14 June 2020 Status: Offline Points: 20 |
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Martin CDD’s are super. The coverage is extremely even with it! You can get replacement drivers from jansen.nz, but normally one needs cabinet + speaker serial number to get a replacement driver. I just bought a pair of Martin Audio XE300 drivers. Custom made B&C coax, just as the Nexo P12. Both produces 140dB on paper.
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