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is a system that achieves many of the advantages of a fully active 3-way system without the need of
additional amplifiers. The hybrid version of the NaO II is also available with substitution of the miniDSP digital
crossover for the analog ACEU.
The midrange is handled by two18 cm Scan Speak 8545 drivers in an MTM format with a 1 inch, fabric
dome Seas T25CF-002 front tweeter. A switchable rear tweeter (Seas 27TDFC) is included for improved
spectral balance at higher frequencies.
The NaO II can also be build as a fully active speaker by installing an optional, midrange/tweeter active
crossover board.
The NaO II system employs a damped U-frame woofer system, using either a single or dual Peerless 10"
XLS woofers for each channel. The U-frame format achieves nominally 6dB greater sensitivity on axis than a
more conventional H-frame or W-frame dipole woofer of similar bulk size and driver compliment. As a result,
the single woofer version of the NaO II U-frame can produce low frequency sound pressures of the same
magnitude as a system using dual 10" XLS woofers in an H or W-frame format of similar front to back length.
The custom designed active crossover/eqaulization unit adds flexibility in tuning the system to your tastes
and to your room.
A unique feature of the NaO II woofer system is that it can also be operated in a sealed box format through
the installation of a removable rear panel on the woofer enclosure and flipping a switch on the ACEU. The
ACEU then provides the correct equalization to maintain the same woofer alignment as when operated in
U-frame format. When the NaO II woofer system is place in sealed box mode, as might be done during home
theater use, the single woofer per side version can produce low frequency sound pressures that are in
excess of those which can be achieved with a typical, single 12" subwoofer without the need for an additional
amplifier or crossover. Thus, there is no need for an additional subwoofer with the NaO II, even when used in
home theater applications. If even higher sound pressures are required the dual woofer configuration of the
NaO II U-frame would be recommended, providing greater low frequency capability than a home theater
system employing two typical 12" subwoofers. The modular format of the NaO II also allows considerable
architectural flexibility in its cabinet design without impacting performance.
*A fully active version of the NaO II is also available.
** The Hybrid version of the NaO II is now available with pre-programmed miniDSP digital crossover.
additional amplifiers. The hybrid version of the NaO II is also available with substitution of the miniDSP digital
crossover for the analog ACEU.
The midrange is handled by two18 cm Scan Speak 8545 drivers in an MTM format with a 1 inch, fabric
dome Seas T25CF-002 front tweeter. A switchable rear tweeter (Seas 27TDFC) is included for improved
spectral balance at higher frequencies.
The NaO II can also be build as a fully active speaker by installing an optional, midrange/tweeter active
crossover board.
The NaO II system employs a damped U-frame woofer system, using either a single or dual Peerless 10"
XLS woofers for each channel. The U-frame format achieves nominally 6dB greater sensitivity on axis than a
more conventional H-frame or W-frame dipole woofer of similar bulk size and driver compliment. As a result,
the single woofer version of the NaO II U-frame can produce low frequency sound pressures of the same
magnitude as a system using dual 10" XLS woofers in an H or W-frame format of similar front to back length.
The custom designed active crossover/eqaulization unit adds flexibility in tuning the system to your tastes
and to your room.
A unique feature of the NaO II woofer system is that it can also be operated in a sealed box format through
the installation of a removable rear panel on the woofer enclosure and flipping a switch on the ACEU. The
ACEU then provides the correct equalization to maintain the same woofer alignment as when operated in
U-frame format. When the NaO II woofer system is place in sealed box mode, as might be done during home
theater use, the single woofer per side version can produce low frequency sound pressures that are in
excess of those which can be achieved with a typical, single 12" subwoofer without the need for an additional
amplifier or crossover. Thus, there is no need for an additional subwoofer with the NaO II, even when used in
home theater applications. If even higher sound pressures are required the dual woofer configuration of the
NaO II U-frame would be recommended, providing greater low frequency capability than a home theater
system employing two typical 12" subwoofers. The modular format of the NaO II also allows considerable
architectural flexibility in its cabinet design without impacting performance.
*A fully active version of the NaO II is also available.
** The Hybrid version of the NaO II is now available with pre-programmed miniDSP digital crossover.
Não em uma caixa.
"Not in a box"
"Not in a box"
The NaO Note is the latest generation of NaO DIY Dipole
loudspeakers. Introduced in the fall of 2010 the NaO Note
represents the next step forward in the design of dipole speakers
using conventional dynamic drivers. The design objectives of the
NaO Note are similar to those of the NaO II but they are addressed
loudspeakers. Introduced in the fall of 2010 the NaO Note
represents the next step forward in the design of dipole speakers
using conventional dynamic drivers. The design objectives of the
NaO Note are similar to those of the NaO II but they are addressed
from a different design approach. The design differences are directed at achieving
constant directivity above the sparsely populated room mode frequency range (above
approximately 100 Hz) in the form of more uniform horizontal polar response in the front
hemisphere and retention of the dipole pattern to significantly higher frequency than
currently seen in other dipole designs. The picture to the right shows the NaO Note
speaker system. The driver complement for the Note panel consists of two Seas
ER18RNX mid woofers, a Scan Speak Discovery 10F4424 upper midrange and a B&G
Neo 3 PDR tweeter. The Neo 3 tweeter operates in dipole mode, without a rear
chamber, and is mounted in a simple, front and rear symmetrical wave guide eliminating
the need for s separate rear tweeter. The panel is a 3.5 way design with the lower ER18
being used only boost the output below 300 Hz. The woofer system uses two Peerless
XXLS 835016 woofers in a U-frame format.
In addition to the improvement in controlling directivity, the NaO Note also addresses
cost. The NaO Note can be built for about $2000. The plan set is available for $220.
Many of the features which made the NaO II a speaker of the highest quality are retained
in the NaO Note. The Note remains a modular design consisting of 4 components:
constant directivity above the sparsely populated room mode frequency range (above
approximately 100 Hz) in the form of more uniform horizontal polar response in the front
hemisphere and retention of the dipole pattern to significantly higher frequency than
currently seen in other dipole designs. The picture to the right shows the NaO Note
speaker system. The driver complement for the Note panel consists of two Seas
ER18RNX mid woofers, a Scan Speak Discovery 10F4424 upper midrange and a B&G
Neo 3 PDR tweeter. The Neo 3 tweeter operates in dipole mode, without a rear
chamber, and is mounted in a simple, front and rear symmetrical wave guide eliminating
the need for s separate rear tweeter. The panel is a 3.5 way design with the lower ER18
being used only boost the output below 300 Hz. The woofer system uses two Peerless
XXLS 835016 woofers in a U-frame format.
In addition to the improvement in controlling directivity, the NaO Note also addresses
cost. The NaO Note can be built for about $2000. The plan set is available for $220.
Many of the features which made the NaO II a speaker of the highest quality are retained
in the NaO Note. The Note remains a modular design consisting of 4 components:
1) A midrange/tweeter panel;
2) A unique U-frame woofer system;
3) A passive panel crossover;
4) An Active Woofer/Panel Crossover Equalization Unit (ACEU).
The NaO Note follows the active/passive hybrid design philosophy used in all NaO designs resulting in an
efficient, biamplified system. A passive crossover is used to combine the drivers on the main panel without the
use of resistive attenuation. The crossover between the woofer system and the panel is controlled by an active
crossover which also applies the required active equalization to the woofer and the panel so as to achieve the
desired acoustic targets.
While the NaO Note is designed as a complete system with U-frame woofer, it is possible to build the system
using alternate woofer formats. For those who feel a true dipole system should use a dipole woofer as well, all
NaO Note plan sets include modifications for a fully designed and tested dipole woofer using two Peerless
XXLS 835016 woofers per speaker mounted in opposition. The dipole woofer has the advantage of
cancellation of even order distortion, and may couple to the room modes differently than the U-frame format.
The disadvantage is that the maximum sound pressure at the lowest frequencies is reduced by between 4 to 6
dB compared to the U-frame. For those on a tighter budget sealed and ported box options using only a single
woofer per speaker are also provided. The sealed box system provides maximum sound pressure
capabilities similar to the dual woofer U-frame option and is designed to have the same alignment. The ported
options provides even greater maximum sound pressure capability but with the potential draw backs of any
ported design. Each woofer system has be carefully designed and tested to mate properly to the NaO Note
main panel.
As should be evident, the NaO Note represents an advance in the design of DIY dipole speaker systems while
at the same time providing flexibility to suite the acoustic and/or economic requirements of the builder.
Regardless of the woofer format chosen you ca be assured that the performance of the NaO Note will be of the
highest quality.
Please use the menu to the left and above to explore further details of the NaO Note.
2) A unique U-frame woofer system;
3) A passive panel crossover;
4) An Active Woofer/Panel Crossover Equalization Unit (ACEU).
The NaO Note follows the active/passive hybrid design philosophy used in all NaO designs resulting in an
efficient, biamplified system. A passive crossover is used to combine the drivers on the main panel without the
use of resistive attenuation. The crossover between the woofer system and the panel is controlled by an active
crossover which also applies the required active equalization to the woofer and the panel so as to achieve the
desired acoustic targets.
While the NaO Note is designed as a complete system with U-frame woofer, it is possible to build the system
using alternate woofer formats. For those who feel a true dipole system should use a dipole woofer as well, all
NaO Note plan sets include modifications for a fully designed and tested dipole woofer using two Peerless
XXLS 835016 woofers per speaker mounted in opposition. The dipole woofer has the advantage of
cancellation of even order distortion, and may couple to the room modes differently than the U-frame format.
The disadvantage is that the maximum sound pressure at the lowest frequencies is reduced by between 4 to 6
dB compared to the U-frame. For those on a tighter budget sealed and ported box options using only a single
woofer per speaker are also provided. The sealed box system provides maximum sound pressure
capabilities similar to the dual woofer U-frame option and is designed to have the same alignment. The ported
options provides even greater maximum sound pressure capability but with the potential draw backs of any
ported design. Each woofer system has be carefully designed and tested to mate properly to the NaO Note
main panel.
As should be evident, the NaO Note represents an advance in the design of DIY dipole speaker systems while
at the same time providing flexibility to suite the acoustic and/or economic requirements of the builder.
Regardless of the woofer format chosen you ca be assured that the performance of the NaO Note will be of the
highest quality.
Please use the menu to the left and above to explore further details of the NaO Note.
The NaO II:
The NaO II has its roots in the original NaO prototype loudspeaker introduced in
2003. The design was refined to the NaO II in 2005. While on a technical basis the
NaO II polar response is surpassed by the NaO Note, the NaO II remains the top of
the line NaO speaker in terms of listening performance and naturalness of
reproduction. A complete plan set with required PCB is available for $250. The NaO
II can be build for about $2500 plus cabinets. The system is of a modular format
consisting of four components:
1) A midrange/tweeter panel;
2) A unique U-frame woofer system;
3) A passive midrange/tweeter crossover;*
4) An Active Woofer/Panel Crossover Equalization Unit (ACEU)**.
The NaO II uses a hybrid active/passive design philosophy in a cost effective,
biamplified format. A carefully designed passive crossover is used between the
midrange and the tweeter. The ACEU controls the woofer/panel crossover and
required dipole equalization for both the woofer and the midrange. The result
The NaO II has its roots in the original NaO prototype loudspeaker introduced in
2003. The design was refined to the NaO II in 2005. While on a technical basis the
NaO II polar response is surpassed by the NaO Note, the NaO II remains the top of
the line NaO speaker in terms of listening performance and naturalness of
reproduction. A complete plan set with required PCB is available for $250. The NaO
II can be build for about $2500 plus cabinets. The system is of a modular format
consisting of four components:
1) A midrange/tweeter panel;
2) A unique U-frame woofer system;
3) A passive midrange/tweeter crossover;*
4) An Active Woofer/Panel Crossover Equalization Unit (ACEU)**.
The NaO II uses a hybrid active/passive design philosophy in a cost effective,
biamplified format. A carefully designed passive crossover is used between the
midrange and the tweeter. The ACEU controls the woofer/panel crossover and
required dipole equalization for both the woofer and the midrange. The result
The NaO Mini:
The NaO Mini, introduced in 2006, was a very popular introductory level dipole design. It was a 2-way hybrid
design based on the Peerless Exclusive 7" midwoofer and Seas 27TDFC tweeter in an MTM format
combined with a conventional sealed box subwoofer based on the Peerless XXLS woofer. The Mini MTM
panels can be used as a stand alone 2-way system at moderate listening levels with limited bass response.
The Peerless XXLS woofer has since been discontinued. Plans for the NaO Mini are no longer available.
NaO systems are available in several optional formats from complete plans, including the required printed
circuit board for the active circuits, to assembled and tested active crossovers. An optional active
midrange/tweeter crossover module is also available for the NaO II making it a fully active system requiring a
minimum of 3 channels of amplification per speaker. To learn more about NaO speakers please browse
using the menu to the left or contact Music and Design with your questions or to arrange an audition.
The NaO Mini, introduced in 2006, was a very popular introductory level dipole design. It was a 2-way hybrid
design based on the Peerless Exclusive 7" midwoofer and Seas 27TDFC tweeter in an MTM format
combined with a conventional sealed box subwoofer based on the Peerless XXLS woofer. The Mini MTM
panels can be used as a stand alone 2-way system at moderate listening levels with limited bass response.
The Peerless XXLS woofer has since been discontinued. Plans for the NaO Mini are no longer available.
NaO systems are available in several optional formats from complete plans, including the required printed
circuit board for the active circuits, to assembled and tested active crossovers. An optional active
midrange/tweeter crossover module is also available for the NaO II making it a fully active system requiring a
minimum of 3 channels of amplification per speaker. To learn more about NaO speakers please browse
using the menu to the left or contact Music and Design with your questions or to arrange an audition.
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