In this review, we will be comparing Blackstone TL1 and A135C, two Passive Center Channel speakers from Polk Audio and JBL. Let's have a brief look at the main features
of Polk TL1 and JBL Stage A135C first before getting into our more
detailed comparison.
What size room are the Polk TL1 and JBL Stage A135C 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 Polk TL1 and JBL Stage A135C 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 Blackstone TL1 and A135C are 2-way speakers.
Driver |
Polk TL1 |
JBL Stage A135C |
Driver Setup
|
2-way
|
2-way
|
Tweeter
|
0.5-inch
|
1-inch
|
Midrange
|
- |
- |
Woofer
|
2 x 2.5-inch
|
6 x 3-inch
|
Blackstone TL1 features a 0.5" silk dome Tweeter and 2 x 2.5" Dynamic Balance Woofer . On the other hand, the A135C features a 1" aluminum dome with HDI (High Definition Imaging) waveguide technology Tweeter and 6 x 3" polycellulose Woofer .
Frequency Response
Blackstone TL1 has a frequency range of 125-20k Hz whereas A135C has a frequency range of 75-40k Hz. With a minimum frequency of 75Hz, the A135C can go significantly deeper on the low side and provide stronger bass compared to the Blackstone TL1's min frequency of 125Hz.
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 Center Channel class in our database.
Low Frequency
Center Channel Speakers
High Frequency
Center Channel 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
Blackstone TL1 is a 8 ohms speaker compared to the A135C which has a nominal impedance of 6 ohms.
These two speakers also have different sensitivity levels. Blackstone TL1 sensitivity is rated at 89 dB and the A135C's is rated at 90 dB. This 1 dB difference makes the JBL Stage A135C a more sensitive speaker compared to Polk TL1, hence will play louder with the same amount of watts.
Sensitivity
Center Channel 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.
Blackstone TL1 can handle a max power of 150 watts RMS from the amp the whereas Blackstone TL1 has a max power handling value of 125 watts RMS , 25 watts less than the A135C.
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
Blackstone TL1 features 5-way post type posts and A135C has a 5-way post type posts. None of these speakers feature bi-amping/bi-wiring.
Cabinet Type and Port Position
Blackstone TL1 has a rear firing port whereas A135C has a side firing ports.
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 Polk TL1's and JBL Stage A135C's external dimensions. Polk TL1 has external dimensions of 101.0 x 381.0 x 88.0mm ( 3-15/16 x 15 x 3-7/16inch) whereas JBL Stage A135C has external dimensions of 105.0 x 747.0 x 186.0mm ( 4-1/8 x 29-3/8 x 7-5/16inch) .
JBL Stage A135C is clearly the larger of the two speakers. Its body is 366mm wider, 4mm taller and 98mm deeper than Polk TL1.
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 Polk TL1 is approximately 335.3cm2 / 52.0inch2 and base area of the JBL Stage A135C is approximately 1389.4cm2 / 215.4inch2. The Blackstone TL1 requires 76% less surface area than the A135C 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 Polk TL1 weighs 1.84kg / 4lbs and the JBL Stage A135C weighs 7.46kg / 16.4lbs. This makes the A135C 305% heavier than the Blackstone TL1.
Here is a comparison of how Blackstone TL1 and A135C's weights compare with the average, max and min weights in Passive Center Channel class.
Weight
All Center Channel Speakers
What's in the Box of Polk TL1?
Here are the items that are included inside the box of Blackstone TL1:
Gloss-black center-channel loudspeakerDetachable black cloth grille (attached)System Diagram/Warranty sheetTemplateOnline Product Registration cardImportant Safety Instructions
What's in the Box of JBL Stage A135C?
Here are the items that come with the A135C:
Center-channel loudspeakerGrille4 Leveling feet4 Rubber feetOwners ManualWarranty Card
Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
Height |
101mm
vs
105mm
|
Easier to fit in smaller spaces |
Base Surface Area |
335cm2 (381x88mm)
vs
1389cm2 (747x186mm)
|
Takes less floor space |
Price per pair* |
79USD
vs
300USD
|
costs less (*prices may change depending on the seller, location and time) |
Max Input Power |
150 watts
vs
125 watts
|
Handle more power from your amplifier |
Sensitivity |
90 dB
vs
89 dB
|
Play louder with same amount of amplification power |
Woofer Size |
3 inches
vs
2.5 inches
|
Larger woofer |
Number of Woofers |
6
vs
2
|
More woofers |
Low Frequency Response |
75 Hz
vs
125 Hz
|
Generates deeper bass |
High Frequency Response |
40k Hz
vs
20k Hz
|
Generates higher frequency |
General |
Polk Audio Blackstone TL1 |
JBL Stage A135C |
Brand |
Polk Audio |
JBL |
Speaker Type |
Center channel speaker |
Low-profile center channel speaker |
Power Range |
10-125 watts |
20-150 watts |
Sensitivity |
89 dB |
90 dB |
Impedance |
8 ohms |
6 ohms |
Frequency Response |
125-20k Hz |
75-40k Hz |
Drivers |
|
|
Woofer Quantity |
2 |
6 |
Woofer Size |
2.5" |
3" |
Woofer Composition |
Dynamic Balance |
polycellulose |
Tweeter Size |
0.5" |
1" |
Tweeter Type |
dome |
dome with HDI (High Definition Imaging) waveguide technology |
Aimable Tweeter |
No |
No |
Midrange Driver |
No |
N/A" |
Firing Direction |
rear |
side |
Physical Specs |
|
|
Height |
101.0mm (4") |
105.0mm (4.1") |
Width |
381.0mm (15") |
747.0mm (29.4") |
Depth |
88.0mm (3.5") |
186.0mm (7.3") |
Weight |
1.84kg (4lbs) |
7.46kg (16.4lbs) |
Enclosure |
Bass Reflex |
Bass Reflex |
Available Colors |
Gloss Black |
Black |
Grille |
Yes |
Yes |
Moisture Resistancy |
No |
No |
Connections |
|
|
Biamp Inputs |
n/a |
No |
Other |
|
|
Parts Warranty |
5 Years |
5 Years |
Labor Warranty |
5 Years |
5 Years |