In this review, we will be comparing Theva No3 and Opticon 8 MK2, two Passive Floor-standing speakers from Focal and DALI. Let's have a brief look at the main features
of Focal Theva No3 and DALI Opticon 8 II first before getting into our more
detailed comparison.
Focal Theva No3 Key Specs
- 3-way Design
- 1" inverted dome Tweeter
- 6.5" Midrange
- 2 x 6.5" Slatefiber Woofer
- 48-28kHz Frequency Response
- 91 dB Sensitivity
- Impedance: 8ohms
- Power Range:40-250watts
- Weight:20.00kg
- Dimensions (H x W x D): 991.0" x 8-3/8" x 15-1/4"( 991.0 x 213.0 x 388.0mm )
DALI Opticon 8 II Key Specs
- 3-way Design
- 17 x 45 mm ribbon + 1.125" Soft-dome + ribbon Hybrid Tweeter
- 6.5" Midrange
- 2 x 8" Wood Fiber Woofer
- 6.5" Midrange
- 38-30k Hz Frequency Response
- 88 dB Sensitivity
- Impedance: 4ohms
- Power Range:40-300watts
- Weight:37.10kg
- Dimensions (H x W x D): 1150.0" x 9-1/2" x 18-1/16"( 1150.0 x 245.0 x 459.0mm )
What size room are the Focal Theva No3 and DALI Opticon 8 II 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* |
Focal Theva No3 |
DALI Opticon 8 II |
| 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.)
In the following sections, we will get into more detail in order to better understand how the Focal Theva No3 and DALI Opticon 8 II compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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Drivers
Both Theva No3 and Opticon 8 MK2 are 3-way speakers.
| Driver |
Focal Theva No3 |
DALI Opticon 8 II |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
17 x 45 mm ribbon + 1.125-inch
|
|
Midrange
|
1 x 6.5-inch |
1 x 6.5-inch |
|
Woofer
|
2 x 6.5-inch
|
2 x 8-inch
|
Theva No3 features a 1" TNF Al/Mg inverted dome Tweeter , a 6.5" Midrange and 2 x 6.5" Slatefiber Woofer with a Crossover frequency at 270 Hz - 2700 Hz. On the other hand, the Opticon 8 MK2 features a 17 x 45 mm ribbon + 1.125" Soft-dome + ribbon Hybrid Tweeter , a 6.5" Midrange and 2 x 8" Wood Fiber Woofer with a Crossover frequency at 380Hz, 2200Hz and 14,000Hz.
Frequency Response
Theva No3 has a frequency range of 48-28kHz whereas Opticon 8 MK2 has a frequency range of 38-30k Hz. With a minimum frequency of 38Hz, the Opticon 8 MK2 can go significantly deeper on the low side and provide stronger bass compared to the Theva No3's min frequency of 48Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
Theva No3 is a 8 ohms speaker compared to the Opticon 8 MK2 which has a nominal impedance of 4 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the Opticon 8 MK2 can provide this impedance level.
These two speakers also have different sensitivity levels. Theva No3 sensitivity is rated at 91 dB and the Opticon 8 MK2's is rated at 88 dB. This 3 dB difference makes the Focal Theva No3 a more sensitive speaker compared to DALI Opticon 8 II, 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. While using an amplifier within this range ensures the nominal performance , inputting a power that is higher than the max wattage can result in a damaged speaker.
Theva No3 can handle a max power of 300 watts RMS from the amp the whereas Theva No3 has a max power handling value of 250 watts RMS , 50 watts less than the Opticon 8 MK2.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
Opticon 8 MK2 features Post posts which make bi-amping or bi-wiring possible. Theva No3 has a Binding post which doesn't feature bi-amping/bi-wiring.
DALI Opticon 8 II's Post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both Theva No3 and Opticon 8 MK2 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
DALI Opticon 8 II Port
Physical Specs
Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Focal Theva No3's and DALI Opticon 8 II's external dimensions. Focal Theva No3 has external dimensions of 991.0 x 213.0 x 388.0mm ( 39 x 83/8 x 151/4) whereas DALI Opticon 8 II has external dimensions of 1150.0 x 245.0 x 459.0mm ( 45-1/4 x 9-1/2 x 18-1/16inch) .
DALI Opticon 8 II is clearly the larger of the two speakers. Its body is 32mm wider, 159mm taller and 71mm deeper than Focal Theva No3.
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 Focal Theva No3 is approximately 826.4cm2 / 128.1inch2 and base area of the DALI Opticon 8 II is approximately 1124.6cm2 / 174.3inch2. The Theva No3 requires 27% less surface area than the Opticon 8 MK2 which gives it a small advantage 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 Focal Theva No3 weighs 20.00kg / 44lbs and the DALI Opticon 8 II weighs 37.10kg / 81.6lbs. This makes the Opticon 8 MK2 86% heavier than the Theva No3.
Here is a comparison of how Theva No3 and Opticon 8 MK2'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 DALI Opticon 8 II?
Here are the items that come with the Opticon 8 MK2:
Floorstanding loudspeakerGrille2 Binding post jumpers (pre-installed)4 Outrigger feet4 Spikes (with lock nuts)4 Rubber pads4 ScrewsHex-keyWrenchQuick Start GuideCongratulations Card