In this review, we will be comparing Ultra Tower and Demand D15, two Passive Floor-standing speakers from SVS and Definitive Technology.
Let's have a brief look at the main features
of SVS Ultra Tower and Definitive Demand D15 first before getting into our more
detailed comparison.
| Key Specs | SVS Ultra Tower | Definitive Demand D15 |
|---|
| Brand | SVS
United States · founded 1998 | Definitive Technology
United States · founded 1990 |
|---|
| Design | 3-way | 3-way |
|---|
| Tweeter | 1.0" Dome | 1" dome |
|---|
| Midrange | 2 x 6.5" | 5.25" |
|---|
| Woofer | 2 x 8.0" Polypropylene | 2 x 5.25" Carbon-fiber |
|---|
| Frequency response | 28-32k Hz | 48-22k Hz |
|---|
| Sensitivity | 88 dB | 85.5 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 20-300 watts | 30-300 watts |
|---|
| Weight | 34.27kg / 75.4lbs | 23.60kg / 51.9lbs |
|---|
| Dimensions (H x W x D) | 45-5/8" x 13-15/16" x 17-1/2"
1159.0 x 355.0 x 445.0mm | 40-1/4" x 9-1/16" x 12-3/4"
1023.0 x 231.0 x 324.0mm |
|---|
What size room are the SVS Ultra Tower and Definitive Demand D15 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* |
SVS Ultra Tower |
Definitive Demand D15 |
| Near-field |
Bad |
Bad |
| Small Room |
Poor |
Poor |
| Mid-size Room |
Average |
Average |
| Large Room |
Good |
Good |
| Very Large Room |
Average |
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.
Drivers
Both Ultra Tower and Demand D15 are 3-way speakers.
SVS Ultra TowerDefinitive Demand D15
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
SVS Ultra Tower |
Definitive Demand D15 |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1.0-inch
|
1-inch
|
|
Midrange
|
2 x 6.5-inch |
1 x 5.25-inch |
|
Woofer
|
2 x 8.0-inch
|
2 x 5.25-inch
|
Ultra Tower features a 1.0" aluminum Dome Tweeter, a 6.5" Midrange and 2 x 8.0" Polypropylene Woofer with a Crossover frequency at 160HZ and 2000Hz. On the other hand, the Demand D15 features a 1" aluminum dome Tweeter, a 5.25" Midrange and 2 x 5.25" Carbon-fiber Woofer.
Frequency Response
Ultra Tower has a frequency range of 28-32k Hz whereas Demand D15 has a frequency range of 48-22k Hz. With a minimum frequency of 28Hz, the Ultra Tower can go significantly deeper on the low side and provide stronger bass compared to the Demand D15's min frequency of 48Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing 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
Ultra Tower and Demand D15 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Ultra Tower sensitivity is rated at 88 dB and the Demand D15's is at 85.5 dB. This 2 dB difference makes the SVS Ultra Tower a more sensitive speaker compared to Definitive Demand D15, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing 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.
Both handle the same maximum of 300 watts RMS, though Ultra Tower is rated 20-300 watts and Demand D15 30-300 watts.
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
Both Ultra Tower and Demand D15 features dual binding post speaker terminals for bi-amping or bi-wiring.
SVS Ultra Tower's Binding post terminals allows Bi-amping or bi-wiring
Definitive Demand D15'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 SVS Ultra Tower's and Definitive Demand D15's external dimensions. SVS Ultra Tower has external dimensions of 1159.0 x 355.0 x 445.0mm (45-5/8 x 13-15/16 x 17-1/2inch) whereas Definitive Demand D15 has external dimensions of 1023.0 x 231.0 x 324.0mm (40-1/4 x 9-1/16 x 12-3/4inch).
SVS Ultra Tower is clearly the larger of the two speakers. Its body is 124mm wider, 136mm taller and 121mm deeper than Definitive Demand D15.
Below you can see the front view size comparison of SVS Ultra Tower and Definitive Demand D15 in scale.
Comparison image of SVS Ultra Tower and Definitive Demand D15 Size and External Dimensions
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 SVS Ultra Tower is approximately 1579.8cm2 / 244.9inch2 and base area of the Definitive Demand D15 is approximately 748.4cm2 / 116.0inch2. The Ultra Tower requires 111% more surface area than the Demand D15 which gives it a small disadvantage on placement in tight spaces.
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The SVS Ultra Tower weighs 34.27kg / 75.4lbs and the Definitive Demand D15 weighs 23.60kg / 51.9lbs. This makes the Ultra Tower 45% heavier than the Demand D15.
Here is a comparison of how Ultra Tower and Demand D15's weights compare with the average, max and min weights in Passive Floor-standing class.
Weight
All Floor-standing Speakers
What's in the Box of SVS Ultra Tower?
Here are the items that are included inside the box of Ultra Tower:
- Floorstanding loudspeaker
- Cloth grille
- 2 Metal grilles
- Foam port plug
- 4 Elastomer isolation feet (pre-installed)
- 4 Spike feet
- 4 Nuts
- 4 Protective discs
- 2 Terminal jumpers (pre-installed)
- Owners Manual
- SVS brochure
- Online Product Registration Card
What's in the Box of Definitive Demand D15?
Here are the items that come with the Demand D15:
- Left floorstanding loudspeaker
- Right floorstanding 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
 Sensitivity |
88 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
8.0 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
28 Hz
vs
48 Hz
|
Generates deeper bass |
 High Frequency Response |
32k Hz
vs
22k Hz
|
Generates higher frequency |
 Price per pair* |
2600USD
vs
2798USD
|
costs less (*prices may change depending on the seller, location and time) |
 Passive Radiator |
2 x 10-inch
vs
None
|
Increases the bass performance |
 Height |
1023mm
vs
1159mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
748cm2
vs
1579cm2
|
Takes less floor space |
| General |
SVS Ultra Tower |
Definitive Technology Demand D15 |
| Brand |
SVS |
Definitive Technology |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
20-300 watts |
30-300 watts |
| Sensitivity |
88 dB |
85.5 dB |
| Impedance |
8 ohms |
8 ohms |
| Frequency Response |
28-32k Hz |
48-22k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
8.0" |
5.25" |
| Woofer Composition |
Polypropylene |
Carbon-fiber |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1.0" |
1" |
| Tweeter Type |
Dome |
dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
6.5" |
5.25" |
| Crossover Frequency |
160HZ and 2000Hz |
n/a |
Physical Specs |
|
|
| Height |
1159.0mm (45.6") |
1023.0mm (40.3") |
| Width |
355.0mm (14") |
231.0mm (9.1") |
| Depth |
445.0mm (17.5") |
324.0mm (12.8") |
| Weight |
34.27kg (75.4lbs) |
23.60kg (51.9lbs) |
| Enclosure |
Bass Reflex |
Passive Radiator |
| Finish |
MDF/Oak veneer |
MDF/Aluminum |
| Available Colors |
Black Oak,Piano Gloss Black,Piano Gloss White |
Gloss Black |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
A generation apart: Definitive Demand D15 is the newer design, against a 2013 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass | A | SVS Ultra Tower digs deeper - 28Hz against 48Hz. |
| Amplifier needs | A | SVS Ultra Tower is more sensitive (88dB vs 86dB), so it goes louder on the same amplifier. |
| Headroom | evenly matched | Similar power handling (300W vs 300W). |
| Size | depends | Definitive Demand D15 is easier to place; SVS Ultra Tower is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Ported vs Passive Radiator. |
| Expandability | depends | SVS Ultra Tower: bi-amping; Definitive Demand D15: bi-amping. |
| Price | evenly matched | Much the same money ($2,600 vs $2,798 a pair). |
A SVS Ultra Tower B Definitive Demand D15
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
SVS Ultra Tower has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 48Hz anyway, so judge these on the other rows instead. In a large or open-plan room, SVS Ultra Tower has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Definitive Demand D15 is the easier speaker to get right.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.