Onkyo D-N9BX and Subwoofer SWA-155X Speaker System

Description

The Onkyo D-N9BX is a pair of bookshelf stereo speakers often associated with Onkyo's mini hi-fi component systems. The Onkyo SWA-155X is an active subwoofer designed to complement these or similar speakers by providing extended low-frequency response. Together, they form a compact yet capable 2.1 channel audio system suitable for smaller to medium-sized rooms.  

• Two-Way Design: These speakers employ two drivers:
  • Woofer: A mid-bass driver, likely with a cone diameter around 12-13 cm (around 5 inches), responsible for reproducing the mid and lower frequencies.
  • Tweeter: A smaller high-frequency driver, usually a soft dome tweeter, designed for clear and detailed treble reproduction.
• Bass-Reflex Enclosure: The ported cabinet design helps to extend the low-frequency response of the woofer, providing a more substantial bass than a sealed enclosure of the same size.  
• Compact Size: Being bookshelf speakers, the D-N9BX are relatively compact, making them easy to place on shelves, stands, or desks without taking up too much space.  
• Binding Posts: They typically feature standard binding posts that can accept bare wire, spade connectors, or banana plugs, offering flexibility in speaker cable connections.  
• Matching Aesthetics: Designed to pair with Onkyo's mini hi-fi systems, they often have a clean and understated aesthetic that complements other components from the same series.
• Good Sensitivity: Bookshelf speakers designed for compact systems often have relatively good sensitivity, allowing them to be driven effectively by the amplifiers found in these systems.

Specifications (Likely, based on similar Onkyo bookshelf speakers):

• Type: 2-way bass-reflex  
• Woofer: Typically around 12-13 cm cone  
• Tweeter: Typically around 2.5 cm (1 inch) soft dome
• Frequency Response: Likely in the range of 50 Hz - 20 kHz (This is an estimate and can vary)
• Sensitivity: Likely around 83-86 dB/W/m (This is an estimate and can vary)
• Impedance: Typically 4 or 6 ohms
• Maximum Input Power: Likely around 70-100 Watts (This is an estimate and can vary)
• Dimensions (W x H x D): Approximately 160-170 x 260-270 x 230-240 mm (These are estimates and can vary)

Onkyo SWA-155X Active Subwoofer: The SWA-155X is an active subwoofer, meaning it has its own built-in amplifier. This allows it to provide the necessary power to reproduce low-frequency sounds effectively without relying on the main amplifier.  

• Powered Subwoofer: The integrated amplifier provides dedicated power for the subwoofer driver.
• Downward-Firing Driver: Many compact subwoofers utilize a downward-firing design, which can help to distribute bass frequencies more evenly throughout the room and make placement less critical.
• Bass-Reflex Design: Like the D-N9BX speakers, the SWA-155X likely employs a bass-reflex enclosure with a port to enhance its low-frequency output.
• Crossover Control: An essential feature of active subwoofers is a built-in low-pass filter (crossover) that allows you to adjust the upper frequency limit of the subwoofer's output. This enables seamless integration with the main speakers.
• Volume Control: A dedicated volume control on the subwoofer allows you to balance its output level with that of the main speakers.
• Phase Control (Possible): Some subwoofers include a phase switch (0 or 180 degrees) to help optimize the integration with the main speakers and minimize bass cancellations due to speaker placement.  
• Input Connections: The SWA-155X typically offers line-level inputs (RCA) to connect to a receiver or amplifier with a subwoofer output. It might also have speaker-level inputs (high-level inputs) for connecting to speaker terminals if a dedicated subwoofer output is not available.

Specifications (Likely, based on similar Onkyo active subwoofers):

• Type: Active bass-reflex subwoofer
• Driver: Likely around 16-20 cm (around 6-8 inches) cone
• Amplifier Power Output: Likely around 50-100 Watts (RMS)
• Frequency Response: Likely in the range of 30 Hz - 150 Hz (This is an estimate and can vary)
• Crossover Frequency: Typically adjustable from around 50 Hz to 200 Hz
• Input Sensitivity/Impedance: Line-level inputs (RCA)
• Dimensions (W x H x D): Approximately 230-250 x 350-370 x 300-320 mm (These are estimates and can vary)