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4X8" DIY Mid-High
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<blockquote data-quote="Robert Kasleder" data-source="post: 208652" data-attributes="member: 12075"><p>The cabinet has to be wide enough to fit 2x8" drivers(this can be reduced by angling the 2 drivers in 90deg) , and also deep enough for the HF950 horn + the BMS4594 driver, and tall enough for 2x8" drivers + the HF950.</p><p>So I have physical limitations on how small the box can be. Like I said I don't have a finished plan yet but based on rough calculation the box should have around 60-70L.</p><p>Being limited by these factors the only way to keep the weight down and to have the highest SPL is to use the lightest driver which can produce the most SPL for this size of a box.</p><p></p><p>And like Peter Morris pointed out in POST #4 linear excursion is also a limiting factor.</p><p></p><p>For example here is a comparison of 4 speakers in their optimum sized box/tuning freq, and at their program power:</p><p>4x BMS 8N519(RED) -45L/75Hz at 2000w</p><p>4x B&C 8NDL64(YELLOW) -30L/75Hz at 2800w</p><p>4x Beyma 8LW30(GREEN) -60L/73Hz at 2000w</p><p>4x B&C 8NDL51(BLUE) -50L/70Hz at 1600w</p><p></p><p>The 8NDL64 has the smallest box(30L) but it needs 2800w to have the same output as the BMS.</p><p>Plus at this power the BMS exceeds it's mathematical Xmax by only 0.5mm, while the B&C exceeds it by 3.5.</p><p>The Beyma is about 1.5-2 dB louder than the BMS and the 8NDL64, but exceeding it's mathematical Xmax by 3.8mm.</p><p>The 8NDL51 is 1dB below the BMS and the 8NDL64, but exceeding it's mathematical Xmax by 2.3mm.</p><p></p><p>So my top pick would be the BMS 8N519, but it costs 200EUR/piece versus the 8NDL51 at 100EUR.</p><p>That means 400 EUR more/cabinet and 800 EUR more for one pair of cabinets, to gain 1dB and have less distorsion.</p><p></p><p>The Beyma 8LW30 is the loudest but when driven with the same power as the 8NDL51(1600w) it's only 1.6 dB louder, and exceeding mathematical Xmax by 3mm. It should also have less power compression at this power compared to the 8NDL51 due to it's larger (2.5") VC and 50w more power handling. It's 20 Euro more expencive and 0.55Kg heavier thatn the 8NDL51.</p><p>So this looks like a good trade off: +2dB for 20Eur, 10L and 2.1Kg/cabinet, and 0.7mm more excursion.</p><p></p><p>The B&C 8MBX51 is almost identical to the 8LW30 in the simulations, but it has smaller VC, 50w less power handling, and 0.5mm less mathematical Xmax.</p></blockquote><p></p>
[QUOTE="Robert Kasleder, post: 208652, member: 12075"] The cabinet has to be wide enough to fit 2x8" drivers(this can be reduced by angling the 2 drivers in 90deg) , and also deep enough for the HF950 horn + the BMS4594 driver, and tall enough for 2x8" drivers + the HF950. So I have physical limitations on how small the box can be. Like I said I don't have a finished plan yet but based on rough calculation the box should have around 60-70L. Being limited by these factors the only way to keep the weight down and to have the highest SPL is to use the lightest driver which can produce the most SPL for this size of a box. And like Peter Morris pointed out in POST #4 linear excursion is also a limiting factor. For example here is a comparison of 4 speakers in their optimum sized box/tuning freq, and at their program power: 4x BMS 8N519(RED) -45L/75Hz at 2000w 4x B&C 8NDL64(YELLOW) -30L/75Hz at 2800w 4x Beyma 8LW30(GREEN) -60L/73Hz at 2000w 4x B&C 8NDL51(BLUE) -50L/70Hz at 1600w The 8NDL64 has the smallest box(30L) but it needs 2800w to have the same output as the BMS. Plus at this power the BMS exceeds it's mathematical Xmax by only 0.5mm, while the B&C exceeds it by 3.5. The Beyma is about 1.5-2 dB louder than the BMS and the 8NDL64, but exceeding it's mathematical Xmax by 3.8mm. The 8NDL51 is 1dB below the BMS and the 8NDL64, but exceeding it's mathematical Xmax by 2.3mm. So my top pick would be the BMS 8N519, but it costs 200EUR/piece versus the 8NDL51 at 100EUR. That means 400 EUR more/cabinet and 800 EUR more for one pair of cabinets, to gain 1dB and have less distorsion. The Beyma 8LW30 is the loudest but when driven with the same power as the 8NDL51(1600w) it's only 1.6 dB louder, and exceeding mathematical Xmax by 3mm. It should also have less power compression at this power compared to the 8NDL51 due to it's larger (2.5") VC and 50w more power handling. It's 20 Euro more expencive and 0.55Kg heavier thatn the 8NDL51. So this looks like a good trade off: +2dB for 20Eur, 10L and 2.1Kg/cabinet, and 0.7mm more excursion. The B&C 8MBX51 is almost identical to the 8LW30 in the simulations, but it has smaller VC, 50w less power handling, and 0.5mm less mathematical Xmax. [/QUOTE]
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