In this review, we will be comparing Concord and Opticon 6 MK2, two Passive Floor-standing speakers from KLH and DALI.
Let's have a brief look at the main features
of KLH Concord and DALI Opticon 6 II first before getting into our more
detailed comparison.
| Key Specs | KLH Concord | DALI Opticon 6 II |
|---|
| Brand | KLH
United States · founded 1957 | DALI
Denmark · founded 1983 |
|---|
| Design | 2-way | 3-way |
|---|
| Tweeter | 1" | 17 x 45 mm ribbon + 1.125" Soft-dome + ribbon Hybrid |
|---|
| Woofer | 2 x 6.5" Kevlar | 2 x 6.5" Wood Fiber |
|---|
| Frequency response | 28-23k Hz | 49-30k Hz |
|---|
| Sensitivity | 94 dB | 88 dB |
|---|
| Impedance | 8 ohms | 4 ohms |
|---|
| Power range | up to 225 watts | 25-200 watts |
|---|
| Weight | 20.45kg / 45lbs | 19.30kg / 42.5lbs |
|---|
| Dimensions (H x W x D) | 40-3/8" x 8-5/16" x 14-15/16"
1026.0 x 212.0 x 380.0mm | 39-3/4" x 7-5/8" x 13-3/8"
1010.0 x 195.0 x 340.0mm |
|---|
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
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Drivers
One of the fundamental differences between these two speakers is that Concord is a 2-way design whereas the Opticon 6 MK2 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.
KLH ConcordDALI Opticon 6 II
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KLH Concord |
DALI Opticon 6 II |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
17 x 45 mm ribbon + 1.125-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 6.5-inch
|
2 x 6.5-inch
|
Concord features a 1" anodized aluminum Tweeter and 2 x 6.5" Kevlar Woofer. On the other hand, the Opticon 6 MK2 features a 17 x 45 mm ribbon + 1.125" Soft-dome + ribbon Hybrid Tweeter and 2 x 6.5" Wood Fiber Woofer with a Crossover frequency at 800Hz, 2200Hz and 14,000Hz.
Frequency Response
Concord has a frequency range of 28-23k Hz whereas Opticon 6 MK2 has a frequency range of 49-30k Hz. With a minimum frequency of 28Hz, the Concord can go significantly deeper on the low side and provide stronger bass compared to the Opticon 6 MK2's min frequency of 49Hz.
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
Concord is a 8 ohms speaker compared to the Opticon 6 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 6 MK2 can provide this impedance level.
These two speakers also have different sensitivity levels. Concord sensitivity is rated at 94 dB and the Opticon 6 MK2's is rated at 88 dB. This 6 dB difference makes the KLH Concord a more sensitive speaker compared to DALI Opticon 6 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. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Concord can handle a max power of 225 watts RMS, whereas Opticon 6 MK2 has a max power handling value of 200 watts RMS, 25 watts less than the Concord.
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
Opticon 6 MK2 features Post posts which make bi-amping or bi-wiring possible. Concord has a 5-Way post which doesn't feature bi-amping/bi-wiring.
KLH Concord's 5-Way post terminals
DALI Opticon 6 II's Post terminals allows Bi-amping or bi-wiring
DALI Opticon 6 II Port
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 KLH Concord's and DALI Opticon 6 II's external dimensions. KLH Concord has external dimensions of 1026.0 x 212.0 x 380.0mm (40-3/8 x 8-5/16 x 14-15/16inch) whereas DALI Opticon 6 II has external dimensions of 1010.0 x 195.0 x 340.0mm (39-3/4 x 7-5/8 x 13-3/8inch).
KLH Concord is clearly the larger of the two speakers. Its body is 17mm wider, 16mm taller and 40mm deeper than DALI Opticon 6 II.
Below you can see the front view size comparison of KLH Concord and DALI Opticon 6 II in scale.
Comparison image of KLH Concord and DALI Opticon 6 II 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 KLH Concord is approximately 805.6cm2 / 124.9inch2 and base area of the DALI Opticon 6 II is approximately 663.0cm2 / 102.8inch2. The Concord requires 22% more surface area than the Opticon 6 MK2 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 KLH Concord weighs 20.45kg / 45lbs and the DALI Opticon 6 II weighs 19.30kg / 42.5lbs. This makes the Concord 6% heavier than the Opticon 6 MK2.
Here is a comparison of how Concord and Opticon 6 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 KLH Concord?
Here are the items that are included inside the box of Concord:
- Floorstanding loudspeaker
- Grille
- 4 Spike feet (w/ locking nut attached)
- 4 Protective discs
- 4 Rubber feet
- Port plug
- Manual
- ATTENTION! note
What's in the Box of DALI Opticon 6 II?
Here are the items that come with the Opticon 6 MK2:
- Floorstanding loudspeaker
- Grille
- 2 Binding post jumpers (pre-installed)
- 4 Outrigger feet
- 4 Spikes (with lock nuts)
- 4 Rubber pads
- 4 Screws
- Hex-key
- Wrench
- Quick Start Guide
- Congratulations Card
 Max Input Power |
225 watts
vs
200 watts
|
Handle more power from your amplifier |
 Sensitivity |
94 dB
vs
88 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
 Low Frequency Response |
28 Hz
vs
49 Hz
|
Generates deeper bass |
 Price per pair* |
1000USD
vs
2500USD
|
costs less (*prices may change depending on the seller, location and time) |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 High Frequency Response |
30k Hz
vs
23k Hz
|
Generates higher frequency |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Height |
1010mm
vs
1026mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
663cm2
vs
805cm2
|
Takes less floor space |
| General |
KLH Concord |
DALI Opticon 6 MK2 |
| Brand |
KLH |
DALI |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
up to 225 watts |
25-200 watts |
| Sensitivity |
94 dB |
88 dB |
| Impedance |
8 ohms |
4 ohms |
| Frequency Response |
28-23k Hz |
49-30k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
6.5" |
6.5" |
| Woofer Composition |
Kevlar |
Wood Fiber |
| Woofer Surround Material |
Butyl Rubber |
Rubber |
| Tweeter Size |
1" |
17 x 45 mm ribbon + 1.125" |
| Tweeter Type |
n/a |
Soft-dome + ribbon Hybrid |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
800Hz, 2200Hz and 14,000Hz |
| Firing Direction |
n/a |
rear |
Physical Specs |
|
|
| Height |
1026.0mm (40.4") |
1010.0mm (39.8") |
| Width |
212.0mm (8.3") |
195.0mm (7.7") |
| Depth |
380.0mm (15") |
340.0mm (13.4") |
| Weight |
20.45kg (45lbs) |
19.30kg (42.5lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood-grain vinyl |
MDF/Wood-grain vinyl |
| Available Colors |
Black |
Satin Black, Tobacco Oak, Satin White |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
Yes |
Other |
|
|
| Parts Warranty |
10 Years |
5 Years |
| Labor Warranty |
10 Years |
5 Years |
These sit in different price classes - DALI Opticon 6 II costs roughly 2.5x what KLH Concord does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | A | KLH Concord digs deeper - 28Hz against 49Hz. |
| Amplifier needs | A | KLH Concord is more sensitive (94dB vs 88dB), so it goes louder on the same amplifier. |
| Amplifier match | A | KLH Concord is the easier load at 8 ohms; the other is 4 ohms and wants an amplifier rated for it. |
| Headroom | evenly matched | Similar power handling (225W vs 200W). |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | B | DALI Opticon 6 II: bi-amping. |
| Price | A | KLH Concord is cheaper - $1,000 against $2,500, about 60% less; arguably a different class. |
A KLH Concord B DALI Opticon 6 II
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?
KLH Concord is the easier recommendation: it leads on most of the measured areas and costs less. Take DALI Opticon 6 II if its size, looks or fit in your room suit you better. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 49Hz anyway, so judge these on the other rows instead. If your amplifier is modest, vintage or valve-based, KLH Concord is the safer partner - the other will want more current or more watts to sound its best.
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.