In this review, we will be comparing Concord and Q750, two Passive Floor-standing speakers from KLH and KEF.
Let's have a brief look at the main features
of KLH Concord and KEF Q750 first before getting into our more
detailed comparison.
| Key Specs | KLH Concord | KEF Q750 |
|---|
| Brand | KLH
United States · founded 1957 | KEF
United Kingdom · founded 1961 |
|---|
| Design | 2-way | 2-way |
|---|
| Uni-Q driver | — | 11th Generation Uni-Q |
|---|
| Tweeter | 1" | 1" Dome |
|---|
| Woofer | 2 x 6.5" Kevlar | 2 x 6.5" Aluminum |
|---|
| Frequency response | 28-23k Hz | 48-28k Hz |
|---|
| Sensitivity | 94 dB | 88 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | up to 225 watts | 15-150 watts |
|---|
| Weight | 20.45kg / 45lbs | 16.59kg / 36.5lbs |
|---|
| 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 | 37-3/16" x 12-7/8" x 12-3/8"
945.0 x 328.0 x 315.0mm |
|---|
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
Drivers
Both Concord and Q750 are 2-way speakers.
KLH ConcordKEF Q750
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 |
KEF Q750 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-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 Q750 features a 1" vented aluminum Dome Tweeter and 2 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
Concord has a frequency range of 28-23k Hz whereas Q750 has a frequency range of 48-28k Hz. With a minimum frequency of 28Hz, the Concord can go significantly deeper on the low side and provide stronger bass compared to the Q750'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
Concord and Q750 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Concord sensitivity is rated at 94 dB and the Q750's is at 88 dB. This 6 dB difference makes the KLH Concord a more sensitive speaker compared to KEF Q750, 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 Q750 has a max power handling value of 150 watts RMS, 75 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
Concord features Binding post type posts and Q750 has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.
KLH Concord's 5-Way post terminals
KEF Q750's Binding post terminals
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 KEF Q750'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 KEF Q750 has external dimensions of 945.0 x 328.0 x 315.0mm (37-3/16 x 12-7/8 x 12-3/8inch).
KEF Q750 is 81mm shorter and 65mm less deeper than KLH Concord but it is also 116mm wider.
Below you can see the front view size comparison of KLH Concord and KEF Q750 in scale.
Comparison image of KLH Concord and KEF Q750 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 KEF Q750 is approximately 1033.2cm2 / 160.1inch2. The Concord requires 22% less surface area than the Q750 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 KLH Concord weighs 20.45kg / 45lbs and the KEF Q750 weighs 16.59kg / 36.5lbs. This makes the Concord 23% heavier than the Q750.
Here is a comparison of how Concord and Q750'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 KEF Q750?
Here are the items that come with the Q750:
- Floorstanding loudspeaker
- 2 Outrigger feet
- 4 Spikes
- 6 Screws
- 6 Washers
- 4 Rubber inserts
- Hex-key
- Owners Manual
- Warranty Information
 Max Input Power |
225 watts
vs
150 watts
|
Handle more power from your amplifier |
 Sensitivity |
94 dB
vs
88 dB
|
Play louder with same amount of amplification power |
 Low Frequency Response |
28 Hz
vs
48 Hz
|
Generates deeper bass |
 Base Surface Area |
805cm2
vs
1033cm2
|
Takes less floor space |
 Price per pair* |
1000USD
vs
1800USD
|
costs less (*prices may change depending on the seller, location and time) |
 High Frequency Response |
28k Hz
vs
23k Hz
|
Generates higher frequency |
 Passive Radiator |
2 x 6.25-inch
vs
None
|
Increases the bass performance |
 Dolby Atmos Drivers |
Optional
vs
No
|
Dolby Atmos Compatibility |
 Height |
945mm
vs
1026mm
|
Easier to fit in smaller spaces |
| General |
KLH Concord |
KEF Q750 |
| Brand |
KLH |
KEF |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
up to 225 watts |
15-150 watts |
| Sensitivity |
94 dB |
88 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.8 ohms |
| Frequency Response |
28-23k Hz |
48-28k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
6.5" |
6.5" |
| Woofer Composition |
Kevlar |
Aluminum |
| Woofer Surround Material |
Butyl Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
n/a |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2500Hz |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
1026.0mm (40.4") |
945.0mm (37.2") |
| Width |
212.0mm (8.3") |
328.0mm (12.9") |
| Depth |
380.0mm (15") |
315.0mm (12.4") |
| Weight |
20.45kg (45lbs) |
16.59kg (36.5lbs) |
| Enclosure |
Bass Reflex |
Passive Radiator |
| Finish |
MDF/Wood-grain vinyl |
MDF/Wood-grain vinyl |
| Available Colors |
Black |
Walnut |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
10 Years |
5 Years |
| Labor Warranty |
10 Years |
5 Years |
These sit in different price classes - KEF Q750 costs roughly 1.8x 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 48Hz. |
| Amplifier needs | A | KLH Concord is more sensitive (94dB vs 88dB), so it goes louder on the same amplifier. |
| Headroom | A | KLH Concord takes more power (225W vs 150W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Cabinet | depends | Ported vs Passive Radiator. |
| Expandability | B | KEF Q750: Atmos drivers. |
| Price | A | KLH Concord is cheaper - $1,000 against $1,800, about 44% less; arguably a different class. |
A KLH Concord B KEF Q750
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 KEF Q750 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 48Hz 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.