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Low Earth Orbit
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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 133445" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p></p><p></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px">The difference between these two designs is that the DIY design has a mid-horn that is about 2ft (600mm) long. The K24 has a bit of horn or cavity that the 12s fire into that will produce a smooth peak around 400Hz. </span></span></span></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px"></span></span></span></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px">As a guess, and after a bit modelling in Hornresp, they will have similar output above 400Hz but from 100 to 300 Hz my design should have about 5 dB more output.</span></span></span></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px"></span></span></span></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px">The BMS4594 compression driver also allows the crossover to be in the 650 – 800 Hz range and it has more output than a normal compression driver. This means the 12s can operate in their piston range and the dipole arrangement does not to cause any issues off axis. The only negative is the vertical pattern of the HF horn gets a bit wide down low. There is also a price $ for components of this quality – they are not cheap.</span></span></span></p><p><span style="font-family: 'arial'"><span style="color: #000000"><span style="font-size: 12px"></span></span></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000">When I looked at Seeburg’s DSP settings for the K24, it nominally crosses at 1000Hz, but it looks like they also have a 700Hz setting, I assume for improved sound quality at the expense of maximum SPL. </span></span><a href="http://www.seeburg.net/LoudspeakerLibrary_HDLM8_10_13.pdf" target="_blank"><span style="font-size: 12px"><span style="color: #0000ff">http://www.seeburg.net/LoudspeakerLibrary_HDLM8_10_13.pdf</span></span></a></span></p><p><span style="font-family: 'arial'"></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000">I also have to say how impressed I am with the 4594HE – the sound quality is stunning, when listening to a good recording the stereo image is so good that you don’t hear the speakers, the sound comes from imaginary instruments and singers behind the speaker, if that make sense. It sounds like you a listen to a set of big studio monitors.</span></span></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000">Regarding the passive crossover – it may be a bit tricky because the horn needs a reasonable amount of delay to time align it with the 12’s. Certainly you could use BMS’s crossover for the 4594 and make the box 2-way. That way you could use it with a 4 channel DSP amp.</span></span></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000">For “throw and go” applications I think it would be easier to build a version to take a Powersoft amp/DSP module.</span></span></span></p><p> <span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'arial'"></span><span style="font-family: 'comic sans ms'"><span style="font-family: 'arial'"><span style="font-size: 12px"><span style="color: #000000">BTW thanks for the Pdf, I had never heard of Seeburg, they have some interesting speakers.</span></span></span></span></p><p><span style="font-family: 'comic sans ms'"></span></p><p><span style="font-family: 'comic sans ms'"></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 133445, member: 652"] Re: New DIY Mid High [FONT=arial][COLOR=#000000][SIZE=3]The difference between these two designs is that the DIY design has a mid-horn that is about 2ft (600mm) long. The K24 has a bit of horn or cavity that the 12s fire into that will produce a smooth peak around 400Hz. [/SIZE][/COLOR] [COLOR=#000000][SIZE=3]As a guess, and after a bit modelling in Hornresp, they will have similar output above 400Hz but from 100 to 300 Hz my design should have about 5 dB more output. [/SIZE][/COLOR] [COLOR=#000000][SIZE=3]The BMS4594 compression driver also allows the crossover to be in the 650 – 800 Hz range and it has more output than a normal compression driver. This means the 12s can operate in their piston range and the dipole arrangement does not to cause any issues off axis. The only negative is the vertical pattern of the HF horn gets a bit wide down low. There is also a price $ for components of this quality – they are not cheap. [/SIZE][/COLOR] [SIZE=3][COLOR=#000000]When I looked at Seeburg’s DSP settings for the K24, it nominally crosses at 1000Hz, but it looks like they also have a 700Hz setting, I assume for improved sound quality at the expense of maximum SPL. [/COLOR][/SIZE][URL="http://www.seeburg.net/LoudspeakerLibrary_HDLM8_10_13.pdf"][SIZE=3][COLOR=#0000ff]http://www.seeburg.net/LoudspeakerLibrary_HDLM8_10_13.pdf[/COLOR][/SIZE][/URL] [SIZE=3][COLOR=#000000]I also have to say how impressed I am with the 4594HE – the sound quality is stunning, when listening to a good recording the stereo image is so good that you don’t hear the speakers, the sound comes from imaginary instruments and singers behind the speaker, if that make sense. It sounds like you a listen to a set of big studio monitors. [/COLOR][/SIZE] [SIZE=3][COLOR=#000000]Regarding the passive crossover – it may be a bit tricky because the horn needs a reasonable amount of delay to time align it with the 12’s. Certainly you could use BMS’s crossover for the 4594 and make the box 2-way. That way you could use it with a 4 channel DSP amp. [/COLOR][/SIZE] [SIZE=3][COLOR=#000000]For “throw and go” applications I think it would be easier to build a version to take a Powersoft amp/DSP module. [/COLOR][/SIZE] [/FONT][FONT=comic sans ms][FONT=arial][SIZE=3][COLOR=#000000]BTW thanks for the Pdf, I had never heard of Seeburg, they have some interesting speakers.[/COLOR][/SIZE][/FONT] [/FONT] [/QUOTE]
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