[These are listed on ebay w/starting price of $725 and BuyItNow of $950; type 251993512638 in the search window]
12-in. 2-Way High Efficiency (100 dB/W) Speakers with Crossovers - 18Sound 12ND710 and BMS4552ND on 18Sound XT1086 Waveguides
These top quality components will give you high efficiency, low distortion, high output, and low power compression.
Additional and higher resolution pic’s, including close-ups of the fronts and backs of each speaker, are here:
https://www.dropbox.com/sh/0ihap2xyhnqu08j/AADLpkkveElsTXD0fJ1kcKfja?dl=0
I think they're self-explanatory except perhaps for params.jpg; these are the 12ND710 parameters (from LEAP I think) at three different temperatures.
12ND710
Very High Output MB Neodymium Driver
Key Features
101 dB SPL 1W / 1m average sensitivity
75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
450 W AES power handling
Neodymium magnet assembly
Double Demodulating Rings (DDR) for lower distortion and reduced inductance
Humidity resistant cone
Suitable for midbass frequency reproduction
Description
The 12ND710 has been specifically designed for use either as a midbass driver in compact 2-way reflex enclosures or as a direct radiating or horn loaded, dedicated midrange driver, in multi-way touring and fixed installation concert and arena systems.
The neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange because the external magnet configuration is considerably more efficient than traditional under-pole magnet topology.
Consequently, high levels of force factor and power handling with an optimum power to weight ratio have been achieved.
Direct coupling of the special design basket and magnetic assembly with the large heat sink facilitates thermal flux through the ambient air, increasing the power handling capabilities and lowering the power compression.
The curvilinear paper cone has been created with a special high strength wood pulp designed to achieve the best possible linearity within its intended frequency range and to control bell-mode resonances around the cone circumference. The cone is carried by a multiroll suspension formed from a linen-like material which is more resistant to aging and fatigue than traditional materials.
The already low distortion and sound quality are further improved by the use of Double Demodulating Rings technology (DDR) designed to dramatically reduce the intermodulation and harmonic distortion and improve the transient response.
The 12ND710 implements Interleaved Sandwich Voice coil technology (ISV), in which an aluminum coil is wound inside and outside a high strength fiberglas former, providing a better thermal and mechanical performance than conventional coils.
A proprietary humidity-block cone treatment makes the transducer suitable for outdoor use in adverse weather conditions. In addition, a special coating applied to both the top and back plates makes the 12ND710 far more resistant to the corrosive effects of salts and oxidization.
4552ND
1" HIGH FREQUENCY NEODYMIUM COMPRESSION DRIVER
FEATURES :
· Unique Patented Design
· Neodymium Magnet Assembly
· 113 dB Sensitivity 1 W / 1 m
· 1 kHz Crossover
· Extended high Frequency Response up t 20 kHz
· Very small Size and low Weight
· 44.4 mm Sandwich in- and outside Voice Coil
· 8 or 16 Ohm
The BMS 4552ND is a powerful 1" professional compression driver that delivers superb sonic quality in a small package. The unique BMS annular diaphragm together with the high energy neodymium magnet achieve very high sensitivity and linear frequency response up to 20 kHz.
The sound of BMS 4552ND is extremely transparent and detailed, it has an exceptional dynamic range and produces even the most complex music signals with depth and definition. 4552ND - 1" compression driver is designed for a wide variety of applications including high level professional reinforcement systems, studio monitors and high-end audio.
Complete manufacturer data:
12ND710: 250 12ND710 - LF Transducers - Neodymium 12ND710 : Eighteen Sound - professional loudspeakers
4552ND: Overview
XT1086:
0006 XT1086 - XT1086 : Eighteen Sound - professional loudspeakers
These have had only light home theater use at a fraction of their rated power; they were used with a 120W/ch receiver and XO’d to subs at 110 Hz.
The pic of the UniBox simulation shows that you can get an F3 of 75 Hz in 1.4 cu ft box tuned to 70 Hz.
The XO’s were designed by a fellow in Finland with access to professional design s/w and an anechoic chamber; I’m guessing he works for one of the Finnish speaker companies (he didn’t want to say).
His measurements are shown in the pic’s (hardcopies will be included).
The top end will be rolled off from what’s shown because of the foam plugs, which are to reduce HOM’s (higher order modes) per Geddes. The plugs are made from ½-in. layers of 30 ppi filter material as recommended by Geddes.
If I remember correctly I attached them with a couple of dabs of caulk, so you could easily remove them for more top end or for looks; from what I’ve read they only make a noticeable difference at high levels.
The yellow stuff on the back of one of the XT1086's is expanding foam that leaked out when I made a mold for the foam plugs.
These are very high quality components and the sound is very clean and dynamic, but the boxes were too big and I replaced them with a system using woofers with lower efficiency and requiring less volume.
I tossed the ugly left and right boxes but the center channel box (see pic) is free for local pickup.
When I bought the components in 2009 the 12ND710’s were $235 ea, the 4552ND’s were $149 ea, and the XT1086’s were $79 ea; with the XO parts the total was $1540.
The best prices I could find now are $271 for the 12ND710’s, $300 for the 4552ND’s (Amazon), and $99 for the XT1086 (Amazon), so at today’s prices the parts would be $2160.
The 4-in. ports are new; the 3-in. ports are glued together and I believe gave an 80 Hz Fb in a 30-L box.
All of the parts are well packed in two boxes totaling 65 lb.
12-in. 2-Way High Efficiency (100 dB/W) Speakers with Crossovers - 18Sound 12ND710 and BMS4552ND on 18Sound XT1086 Waveguides
These top quality components will give you high efficiency, low distortion, high output, and low power compression.
Additional and higher resolution pic’s, including close-ups of the fronts and backs of each speaker, are here:
https://www.dropbox.com/sh/0ihap2xyhnqu08j/AADLpkkveElsTXD0fJ1kcKfja?dl=0
I think they're self-explanatory except perhaps for params.jpg; these are the 12ND710 parameters (from LEAP I think) at three different temperatures.
12ND710
Very High Output MB Neodymium Driver
Key Features
101 dB SPL 1W / 1m average sensitivity
75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
450 W AES power handling
Neodymium magnet assembly
Double Demodulating Rings (DDR) for lower distortion and reduced inductance
Humidity resistant cone
Suitable for midbass frequency reproduction
Description
The 12ND710 has been specifically designed for use either as a midbass driver in compact 2-way reflex enclosures or as a direct radiating or horn loaded, dedicated midrange driver, in multi-way touring and fixed installation concert and arena systems.
The neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange because the external magnet configuration is considerably more efficient than traditional under-pole magnet topology.
Consequently, high levels of force factor and power handling with an optimum power to weight ratio have been achieved.
Direct coupling of the special design basket and magnetic assembly with the large heat sink facilitates thermal flux through the ambient air, increasing the power handling capabilities and lowering the power compression.
The curvilinear paper cone has been created with a special high strength wood pulp designed to achieve the best possible linearity within its intended frequency range and to control bell-mode resonances around the cone circumference. The cone is carried by a multiroll suspension formed from a linen-like material which is more resistant to aging and fatigue than traditional materials.
The already low distortion and sound quality are further improved by the use of Double Demodulating Rings technology (DDR) designed to dramatically reduce the intermodulation and harmonic distortion and improve the transient response.
The 12ND710 implements Interleaved Sandwich Voice coil technology (ISV), in which an aluminum coil is wound inside and outside a high strength fiberglas former, providing a better thermal and mechanical performance than conventional coils.
A proprietary humidity-block cone treatment makes the transducer suitable for outdoor use in adverse weather conditions. In addition, a special coating applied to both the top and back plates makes the 12ND710 far more resistant to the corrosive effects of salts and oxidization.
4552ND
1" HIGH FREQUENCY NEODYMIUM COMPRESSION DRIVER
FEATURES :
· Unique Patented Design
· Neodymium Magnet Assembly
· 113 dB Sensitivity 1 W / 1 m
· 1 kHz Crossover
· Extended high Frequency Response up t 20 kHz
· Very small Size and low Weight
· 44.4 mm Sandwich in- and outside Voice Coil
· 8 or 16 Ohm
The BMS 4552ND is a powerful 1" professional compression driver that delivers superb sonic quality in a small package. The unique BMS annular diaphragm together with the high energy neodymium magnet achieve very high sensitivity and linear frequency response up to 20 kHz.
The sound of BMS 4552ND is extremely transparent and detailed, it has an exceptional dynamic range and produces even the most complex music signals with depth and definition. 4552ND - 1" compression driver is designed for a wide variety of applications including high level professional reinforcement systems, studio monitors and high-end audio.
Complete manufacturer data:
12ND710: 250 12ND710 - LF Transducers - Neodymium 12ND710 : Eighteen Sound - professional loudspeakers
4552ND: Overview
XT1086:
0006 XT1086 - XT1086 : Eighteen Sound - professional loudspeakers
These have had only light home theater use at a fraction of their rated power; they were used with a 120W/ch receiver and XO’d to subs at 110 Hz.
The pic of the UniBox simulation shows that you can get an F3 of 75 Hz in 1.4 cu ft box tuned to 70 Hz.
The XO’s were designed by a fellow in Finland with access to professional design s/w and an anechoic chamber; I’m guessing he works for one of the Finnish speaker companies (he didn’t want to say).
His measurements are shown in the pic’s (hardcopies will be included).
The top end will be rolled off from what’s shown because of the foam plugs, which are to reduce HOM’s (higher order modes) per Geddes. The plugs are made from ½-in. layers of 30 ppi filter material as recommended by Geddes.
If I remember correctly I attached them with a couple of dabs of caulk, so you could easily remove them for more top end or for looks; from what I’ve read they only make a noticeable difference at high levels.
The yellow stuff on the back of one of the XT1086's is expanding foam that leaked out when I made a mold for the foam plugs.
These are very high quality components and the sound is very clean and dynamic, but the boxes were too big and I replaced them with a system using woofers with lower efficiency and requiring less volume.
I tossed the ugly left and right boxes but the center channel box (see pic) is free for local pickup.
When I bought the components in 2009 the 12ND710’s were $235 ea, the 4552ND’s were $149 ea, and the XT1086’s were $79 ea; with the XO parts the total was $1540.
The best prices I could find now are $271 for the 12ND710’s, $300 for the 4552ND’s (Amazon), and $99 for the XT1086 (Amazon), so at today’s prices the parts would be $2160.
The 4-in. ports are new; the 3-in. ports are glued together and I believe gave an 80 Hz Fb in a 30-L box.
All of the parts are well packed in two boxes totaling 65 lb.
Attachments
Last edited: