In this review, we will be comparing Synchrony B600 and RP-400M, two Passive Bookshelf speakers from PSB and Klipsch. Let's have a brief look at the main features
of PSB Synchrony B600 and Klipsch RP-400M first before getting into our more
detailed comparison.
What size room are the PSB Synchrony B600 and Klipsch RP-400M 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:
In the following sections, we will get into more detail in order to better understand how the PSB Synchrony B600 and Klipsch RP-400M 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 Synchrony B600 and RP-400M are 2-way speakers.
| Driver |
PSB Synchrony B600 |
Klipsch RP-400M |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 4-inch
|
Synchrony B600 features a 1" Hard-Dome Tweeter and 1 x 6.5" Carbon fiber Woofer with a Crossover frequency at 2200Hz. On the other hand, the RP-400M features a 1" Tractrix Horn Tweeter and 1 x 4" Cerametallic Woofer with a Crossover frequency at 1500Hz.
Frequency Response
Synchrony B600 has a frequency range of 55-20k Hz whereas RP-400M has a frequency range of 52-25k Hz. With a minimum frequency of 52Hz, the RP-400M can go slightly deeper then the Synchrony B600's min frequency of 55Hz.
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 Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf 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
Synchrony B600 is a 6 ohms speaker compared to the RP-400M which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. Synchrony B600 sensitivity is rated at 88 dB and the RP-400M's is rated at 93 dB. This 5 dB difference makes the Klipsch RP-400M a more sensitive speaker compared to PSB Synchrony B600, 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. 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.
Synchrony B600 can handle a max power of 150 watts RMS from the amp the whereas RP-400M has a max power handling value of 50 watts RMS, 100 watts less than the Synchrony B600.
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
Synchrony B600 features Binding post posts which make bi-amping or bi-wiring possible. RP-400M has a Single binding posts which doesn't feature bi-amping/bi-wiring.
PSB Synchrony B600's Binding post terminals allows Bi-amping or bi-wiring
Klipsch RP-400M's Single binding posts terminals
Cabinet Type and Port Position
Both Synchrony B600 and RP-400M 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.
Klipsch RP-400M Tractrix horn-shaped 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 PSB Synchrony B600's and Klipsch RP-400M's external dimensions. PSB Synchrony B600 has external dimensions of 402.0 x 232.0 x 345.0mm ( 15-13/16 x 9-1/8 x 13-9/16inch) whereas Klipsch RP-400M has external dimensions of 298.0 x 144.0 x 191.0mm ( 11.7 x 5.6 x 7.5inch) .
PSB Synchrony B600 is clearly the larger of the two speakers. Its body is 88mm wider, 104mm taller and 154mm deeper than Klipsch RP-400M.
Below you can see the front view size comparison of PSB Synchrony B600 and Klipsch RP-400M in scale.
Comparison image of PSB Synchrony B600 and Klipsch RP-400M 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 PSB Synchrony B600 is approximately 800.4cm2 / 124.1inch2 and base area of the Klipsch RP-400M is approximately 275.0cm2 / 42.6inch2. The Synchrony B600 requires 191% more surface area than the RP-400M which gives it a small disadvantage on placement in tight spaces.
Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:
Size Comparison image of PSB Synchrony B600 and Klipsch RP-400M on a Media Console
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 PSB Synchrony B600 weighs 10.45kg / 23lbs and the Klipsch RP-400M weighs 4.10kg / 9lbs. This makes the Synchrony B600 155% heavier than the RP-400M.
Here is a comparison of how Synchrony B600 and RP-400M's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of PSB Synchrony B600?
Here are the items that are included inside the box of Synchrony B600:
Bookshelf loudspeakrGrille2 Binding-post jumpers (pre-installed)Owners ManualWarranty Card
What's in the Box of Klipsch RP-400M?
Here are the items that come with the RP-400M:
2 Bookshelf loudspeakers 2 Grilles (installed) 8 Self-adhesive rubber feet User Manual Important Safety Instructions Warranty Information
 Max Input Power |
150 watts
vs
50 watts
|
Handle more power from your amplifier |
 Woofer Size |
6.5 inches
vs
4 inches
|
Larger woofer |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Sensitivity |
93 dB
vs
88 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
| Low Frequency Response |
52 Hz
vs
55 Hz
|
Generates deeper bass |
 High Frequency Response |
25k Hz
vs
20k Hz
|
Generates higher frequency |
 Mounting Bracket |
Yes
vs
No
|
Allows mounting on walls |
 Height |
298mm
vs
402mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
275cm2 (144x191mm)
vs
800cm2 (232x345mm)
|
Takes less floor space |
 Price per pair* |
399USD
vs
2500USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
PSB Synchrony B600 |
Klipsch Reference Premiere RP-400M |
| Brand |
PSB |
Klipsch |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
15-150 watts |
up to 50 watts |
| Sensitivity |
88 dB |
93 dB |
| Impedance |
6 ohms |
8 ohms |
| Impedance |
4 ohms |
n/a |
| Frequency Response |
55-20k Hz |
52-25k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
4" |
| Woofer Composition |
Carbon fiber |
Cerametallic |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Hard-Dome |
Tractrix Horn |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2200Hz |
1500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
402.0mm (15.8") |
298.0mm (11.7") |
| Width |
232.0mm (9.1") |
144.0mm (5.7") |
| Depth |
345.0mm (13.6") |
191.0mm (7.5") |
| Weight |
10.45kg (23lbs) |
4.10kg (9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Lacquer |
MDF/Wood-grain vinyl |
| Available Colors |
Gloss Black, Satin Walnut |
Ebony, Walnut, Piano Black |
| Mounting Bracket |
No |
Keyhole |
| Recommended Stand Height |
24-26" |
28-30" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |