In this review, we will be comparing two different types of speakers by Definitive Technology. Definitive Technology Demand Series D7 is a Bookshelf speaker whereas the Demand D17 is a Floor-standing speaker.
Let's have a brief look at the main features
of Definitive Demand D7 and Definitive Demand D17 first before getting into our more
detailed comparison.
| Key Specs | Definitive Demand D7 | Definitive Demand D17 |
|---|
| Design | 2-way | 3-way |
|---|
| Tweeter | 1" Hard-Dome | 1" dome |
|---|
| Midrange | — | 6.5" |
|---|
| Woofer | 4.5" Polypropylene | 2 x 6.5" Carbon-fiber |
|---|
| Frequency response | 67-21k Hz | 42-22k Hz |
|---|
| Sensitivity | 85 dB | 87 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 20-125 watts | 40-300 watts |
|---|
| Weight | 5.45kg / 12lbs | 29.10kg / 64lbs |
|---|
| Dimensions (H x W x D) | 9-7/8" x 5-9/16" x 9-1/8"
251.0 x 142.0 x 232.0mm | 42-3/4" x 10-1/4" x 14-3/4"
1086.0 x 261.0 x 375.0mm |
|---|
Demand D7 and Demand D17 are members of Definitive Technology's Demand series of speakers. Below you can find the loudspeakers from this series.
Definitive Technology Demand Series
History
What size room are the Definitive Demand D7 and Definitive Demand D17 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision
factor. Here we have compared their suitability to various sizes of environments considering their size
and max power parameters:
| Listening Environment* |
Definitive Demand D7 |
Definitive Demand D17 |
| Near-field |
Poor |
Bad |
| Small Room |
Average |
Poor |
| Mid-size Room |
Good |
Average |
| Large Room |
Average |
Good |
| Very Large Room |
Poor |
Average |
(* 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.)
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
**This post contains affiliate links, and we will be compensated if you make a purchase after clicking
through our links. As an Amazon Associate I earn from qualifying purchases.
Drivers
One of the fundamental differences between these two speakers is that Demand D7 is a 2-way design whereas the Demand D17 is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
Definitive Demand D7Definitive Demand D17
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
Definitive Demand D7 |
Definitive Demand D17 |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
1 x 6.5-inch |
|
Woofer
|
1 x 4.5-inch
|
2 x 6.5-inch
|
Demand D7 features a 1" Hard-Dome Tweeter and 1 x 4.5" Polypropylene Woofer. On the other hand, the Demand D17 features a 1" aluminum dome Tweeter, a 6.5" Midrange and 2 x 6.5" Carbon-fiber Woofer.
Frequency Response
Demand D7 has a frequency range of 67-21k Hz whereas Demand D17 has a frequency range of 42-22k Hz. With a minimum frequency of 42Hz, the Demand D17 can go significantly deeper on the low side and provide stronger bass compared to the Demand D7's min frequency of 67Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
Demand D7 and Demand D17 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Demand D7 sensitivity is rated at 85 dB and the Demand D17's is at 87 dB. This 2 dB difference makes the Definitive Demand D17 a more sensitive speaker compared to Definitive Demand D7, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Demand D17 can handle a max power of 300 watts RMS, whereas Demand D7 has a max power handling value of 125 watts RMS, 175 watts less than the Demand D17.
Note that higher power handling does not make a speaker louder: that depends mainly on
sensitivity and impedance. The calculator below shows how loud each of these actually plays
on a real amplifier.
Which plays louder on your amplifier?
Starting with a popular amplifier — change it to the one you own, or any you are
considering, and watch both numbers move.
Input Type and Bi-Amping / Bi-Wiring
Demand D17 features 5-Way Post posts which make bi-amping or bi-wiring possible. Demand D7 has a 5-Way post which doesn't feature bi-amping/bi-wiring.
Definitive Demand D7's 5-Way post terminals
Definitive Demand D17's 5-Way Post terminals allows Bi-amping or bi-wiring
Physical Specs
The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Definitive Demand D7's and Definitive Demand D17's external dimensions. Definitive Demand D7 has external dimensions of 251.0 x 142.0 x 232.0mm (9-7/8 x 5-9/16 x 9-1/8inch) whereas Definitive Demand D17 has external dimensions of 1086.0 x 261.0 x 375.0mm (42-3/4 x 10-1/4 x 14-3/4inch).
Definitive Demand D17 is clearly the larger of the two speakers. Its body is 119mm wider, 835mm taller and 143mm deeper than Definitive Demand D7.
Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base surface area of the Definitive Demand D7 is approximately 329.4cm2 / 51.1inch2 and base area of the Definitive Demand D17 is approximately 978.8cm2 / 151.7inch2. The Demand D7 requires 66% less surface area than the Demand D17 which gives it a small advantage on placement in tight spaces.
What's in the Box of Definitive Demand D7?
Here are the items that are included inside the box of Demand D7:
- Left bookshelf loudpseaker
- Right bookshelf loudspeaker
- 2 Grilles
- Cleaning cloth
- Owners Manual
What's in the Box of Definitive Demand D17?
Here are the items that come with the Demand D17:
- Left floorstanindg loudspeaker
- Right floorstading loudspeaker
- 2 Grilles
- 4 Jumper-straps (pre-installed)
- 2 Bases
- 8 Spike feet
- 8 Floor-glides
- 8 Lock-rings
- 8 Screws
- Cleaning cloth
- Owners Manual