SpeakerDecision
  • SPEAKERS by TYPE
    • Passive Bookshelf Speakers
    • Passive Floor-standing Speakers
    • Passive Center Channel Speakers
    • Passive In-wall Speakers
    • All Passive Speakers
    • Powered Subwoofers
    • Powered Stereo Speakers
  • AMPLIFIERS
  • SMART FIND
  1. Home
  2. Definitive-Technology Speakers
  3. Passive Bookshelf Speakers
Definitive Technology Demand D9 Review
Definitive Technology Demand Series D9

Main Features

  • 1" Hard-Dome Tweeter
  • 5.25" Polypropylene Woofer
  • 64-22k Hz Frequency Response
  • 88 dB Sensitivity
  • Impedance: 8ohms
  • Power Range: 20-150watts
  • Weight:17.01 lbs / 7.73 kg
  • Dimensions(HxWxD): 11-13/16"x6-9/16"x12-7/16" / 301.0 x 167.0 x 316.0mm
CHECK PRICE

Compare To

x
Add a Speaker for comparison
Definitive Demand D9 Review
Definitive Demand D9 Definitive Demand D9
See at AMAZON

Definitive Technology Demand Series D9 is a 2-way Passive Passive Radiator Bookshelf speaker by Definitive Technology. It features a 1" Hard-Dome Tweeter and 1 x 5.25" Polypropylene Woofer. The speaker has a frequency range of 64-22k Hz and a sensitivity of 88 dB. Definitive Demand D9 has an MSRP of 749$ per pair but can often be found around 599$ per pair.

Room Size Suitability

The size of the room where you plan to use the Definitive Demand D9 is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:

Listening Environment* Suitability
Near-fieldPoor
Small RoomAverage
Mid-size RoomGood
Large RoomAverage
Very Large RoomPoor

(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2. Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)

Definitive Technology's Demand Series of Loudspeakers

Demand D9 is a member of Definitive Technology's Demand series of Passive speakers. Below you can see the main specs of these speakers.

Definitive Technology Demand Series Speakers
Model Frequency SensitivityImpedance Woofer
Definitive Demand D17
Compare
42-22k Hz 87 dB8Ω 2 x 6.5"
Definitive Demand D7
Compare
67-21k Hz 85 dB8Ω 1 x 4.5"
Definitive Demand D15
Compare
48-22k Hz 85.5 dB8Ω 2 x 5.25"
Definitive D5C
Compare
42-22k Hz 85.5 dB8Ω 2 x 5.25"
Definitive Demand D11
Compare
61-22k Hz 90 dB8Ω 1 x 6.5"
Definitive Demand D9
64-22k Hz 88 dB8Ω 1 x 5.25"


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Frequency Response of the Definitive Demand D9 Speaker

Definitive Demand D9 has a Frequency response range of 64-22k Hz at ±3dB and Power Range of 20-150 watts. With a minimum frequency of 64 Hz, it is hard to expect a strong bass response from Demand D9 so depending on your use case, using a subwoofer will significantly help to widen the response range.

To focus on the subwoofers that are in a similar price range with Definitive Demand D9, check out the Powered Subwoofers under $750. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how Demand D9's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Bookshelf Speakers
Definitive Demand D9
Min
Average
Max
High Frequency
Bookshelf Speakers
Definitive Demand D9
Min
Average
Max

Impedance and Sensitivity

Definitive Demand D9's nominal impedance level is 8 ohms and has a sensitivity of 88 dB.

Sensitivity
Bookshelf Speakers
Definitive Demand D9
Min
Average
Max

8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Definitive Technology Demand Series D9 is not considered a difficult to drive speaker from nominal Impedance perspective.

Sensitivity

88dB of the Definitive Technology Demand Series D9 is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise.

Check the amplifiers that are in a similar price range to the Definitive Demand D9:

  • Integrated Amps under 500 USD
  • Integrated Amps under 750 USD
  • Integrated Amps under 1000 USD
  • All Integrated Amplifiers

Input Type

Demand D9 has 5-Way post type connectors and lets bi-amping/bi-wiring. Bi-wiring can enhance the overall transparency of your loudspeakers by using separate speaker wires for the low and high-frequency drivers from a single amplifier. Bi-amping, on the other hand, involves using separate amplifiers for the high and low-frequency drivers, potentially resulting in a greater dynamic range and reduced distortion.

Definitive Demand D9 External Dimensions and Weight

Definitive Demand D9 has external dimensions of (Height x Width x Depth) 11-13/16 x 6-9/16 x 12-7/16inch (301.0 x 167.0 x 316.0mm ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of Definitive Demand D9 is approximately 527.7cm2 / 81.8inch2.

To get a better perspective on the real life size of Definitive Demand D9, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).

Definitive Demand D9 Real Life Body Size Comparison
Definitive Demand D9 Speaker Size Compared to a Compact Disc

Here we place the Definitive Demand D9 virtually next to a standard width amplifier and turntable on a BDI Octave Media Cabinet to get a better idea about the size.

Definitive Demand D9 placed next to an amplifier and turntable
Definitive Demand D9 Speaker next to an amplifier and turntable

Weight

The Definitive Demand D9 weighs 7.73kg / 17lbs per piece. Here is a comparison of how Demand D9's weight compares with the average, max and min weights in its class.

Weight
All Bookshelf Speakers
Definitive Demand D9
Min
Average
Max
Weight
Bookshelf Speakers under $750
Definitive Demand D9
Min
Average
Max

How does the Definitive Demand D9 compare to the Definitive Technology Demand Series D11?

One of the natural alternative to the Definitive Demand D9 is the Demand D11 which is located one step higher in Definitive Technology's Passive Bookshelf selection.

Check the Detailed Comparison of Definitive Demand D9 vs Demand D11 for more details.

Cabinet type and Materials

Definitive Demand D9 has a Passive Radiator type cabinet and a MDF/Aluminum finish.

Available colors

Definitive Demand D9 is available in Gloss White and Piano Black.

Wall Mounting

Demand D9 doesn't sport any built-in mounting bracket, so you need an external structure to mount it on walls.

Does the Definitive Demand D9 come with a Grille?

Demand D9 comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.

What's in the Box of Definitive Demand D9?

Here are the items that are included inside the box of Demand D9:
  • Left bookshelf loudpseaker
  • Right bookshelf loudspeaker
  • 2 Grilles
  • 4 Jumper-straps (pre-installed)
  • Cleaning cloth
  • Owners Manual
  • Recommended Accessories

    Here is a list of accessories that we think you may need for the Definitive Technology Demand Series D9.

    • Speaker Cable and Connectors
      • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
      • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
      • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
    • Vibration Isolators: IsoAcoustics isolators more affordable options too.
    • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
    • Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.

    Warranty

    5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.

    Definitive Technology Demand Series D9 Alternatives in Passive Bookshelf Speakers
    Model Type Sensitivity Impedance Frequency
    Definitive Demand D11
    Compare
    2-way 90 dB 8 ohms 61-22k Hz
    Definitive Demand D7
    Compare
    2-way 85 dB 8 ohms 67-21k Hz
    KEF Q150
    Compare
    2-way 86 dB 8 ohms 51-28k Hz
    B&W 606
    Compare
    2-way 88 dB 8 ohms 52-28k Hz
    Polk ES20
    Compare
    2-way 86 dB 8 ohms 41-40k Hz
    B&W 606 S2
    Compare
    2-way 88 dB 8 ohms 52-28k Hz
    Definitive Demand D15
    Compare
    3-way 85.5 dB 8 ohms 48-22k Hz
    Definitive D5C
    Compare
    2-way 85.5 dB 8 ohms 42-22k Hz
    Frequently Asked Questions about Definitive Technology Demand Series D9
    What is the External Dimensions of Definitive Technology Demand Series D9
    What is the Speaker Sensitivity of Definitive Technology Demand Series D9
    is the Definitive Technology Demand Series D9 an easy to drive speaker?

    Definitive Demand D9 Detailed Specifications

    General
    BrandDefinitive Technology
    Full Model NameDefinitive Technology Demand Series D9
    Speaker Type2-way Bookshelf
    Power Range20-150 watts
    Sensitivity88 dB
    Impedance8 ohms
    Frequency Response64-22k Hz
    DRIVERS
    Woofer Size5.25-inch
    Woofer CompositionPolypropylene
    Woofer SurroundRubber
    Tweeter Size1-inch
    Tweeter TypeHard-Dome

    CONNECTIONS
    Connector Type5-Way post
    Biamp InputsYes
    PHYSICAL SPECS
    Height301.0mm ( 11-13/16-inch)
    Width167.0mm ( 6-9/16-inch)
    Depth316.0mm ( 12-7/16-inch)
    Height301.0mm ( 11-13/16-inch)
    Weight7.73kg ( 17.01 lbs)
    EnclosurePassive Radiator
    FinishMDF/Aluminum
    Available ColorsGloss White,Piano Black
    Mounting BracketNo
    Recommended Stand Height24-28
    GrilleYes
    Moisture ResistanceNo
    OTHER
    Handheld RemoteNo
    Parts Warranty5 Years
    Labor Warranty5 Years
    LATEST BLOG POSTS

    Klipsch La Scala AL6 and Klipschorn AK7 Speakers are Unveiled
    New Audiolab 6000A MkII with upgraded DAC and new HDMI ARC connection
    Q Acoustics 3000c Series Loudspeakers added to the database
    WiiM VibeLink Amp: A Game-Changer for Budget Hi-Fi in 2025
    KEF Meta and Reference Meta Floorstanding Speaker Size and Specs Comparison
    Triangle Borea Bookshelf and Floorstanding Speaker Size and Specs Comparison


    Latest Passive Bookshelf Speakers
    Q Acoustics 3010c
    Q Acoustics 3010c
    2-way Bookshelf | 85 dB | 6 ohms
    Q Acoustics 3020c
    Q Acoustics 3020c
    2-way Bookshelf | 87 dB | 6 ohms
    Q Acoustics 3030c
    Q Acoustics 3030c
    2-way Bookshelf | 86.5 dB | 6 ohms
    Q Acoustics 3010i
    Q Acoustics 3010i
    2-way Bookshelf | 86 dB | 6 ohms
    Triangle Borea BR04
    Triangle Borea BR04
    2-way Bookshelf | 90 dB | 8 ohms
    ELAC Debut 3.0 DB63
    ELAC Debut 3.0 DB63
    2-way Bookshelf | 87 dB | 6 ohms
    ELAC Debut 3.0 DB53
    ELAC Debut 3.0 DB53
    2-way Bookshelf | 86.5 dB | 6 ohms
    Monitor Audio Gold 100 6G
    Monitor Audio Gold 100 6G
    3-way Bookshelf | 86.5 dB | 4 ohms
    Monitor Audio Gold 50 6G
    Monitor Audio Gold 50 6G
    2-way Bookshelf | 85 dB | 4 ohms
    Wharfedale SUPER LINTON
    Wharfedale SUPER LINTON
    3-way Bookshelf | 90 dB | 6 ohms


    Copyright © 2025 by SpeakerDecision
    About Privacy Contact US Camera Decision
    Compare List

      Add a speaker to the List