TWS Reference Design with
Consumer-Preferred Sound and ANC
Reference Design
KN2
Part number TC-35064-000
The Knowles Preferred Earphone Response Curve is the result of extensive consumer testing.
This reference design demonstrates how meeting the curve using a BA tweeter delivers
premium sound that users demand.
Key Benefits
Key Features
Fast time to market for TWS with consumerpreferred sound, ANC, and advanced features
Turnkey reference design, aesthetic
customizations possible
Manufactured by a leading ODM
Knowles balanced armature + dynamic
combined to achieve the Knowles Preferred
Listening Curve
Top-quality Knowles balanced armature
tweeters and MEMS microphones
Hybrid ANC with transparency mode
8 hours battery life streaming
Hybrid
Dynamic woofer
BA tweeter
Dual-mic outgoing noise reduction
Temperature and in-ear sensors
Qualcomm QCC5144 supporting SBC, AAC,
aptX. (aptX Adaptive with license)
Configuration of a hybrid earphone
In a hybrid configuration, each driver plays to its
strengths. The dynamic woofer provides warm bass
with sufficient output to support quality ANC. The
balanced armature tweeter delivers clear, precise
extended treble that adds life and vibrancy to the
music. Hybrids are the fastest way to achieve premium
sound with ANC compatibility and plenty of headroom
for hearing personalization.
KN2 | TWS Reference Design with Consumer-Preferred Sound and ANC
1
Performance Measurements
0dBFS-Response vs. Frequency
KN2 - Sample data, BT (00dBFS), TWS Earpiece into 711 (RA401), 08/29/2022
130
Frequency response with ANC on
and off.
dB SPL
120
110
100
Knowles Curve
ANC off
90
ANC on
80
10
100
Frequency (Hz)
1,000
10,000
1/3rd Octave ANC Noise Reduction Average
KN2 - Sample data, TWS Earpiece into 711 (RA401), 08/29/2022
10
ANC performance, active and
passive. Average of four directions
and two ears.
dB SPL
0
-10
-20
Total
Passive
-30
Active
-40
10
100
Frequency (Hz)
1,000
10,000
Occluded Sound Reduction vs. Frequency
KN2 - Sample data, TWS Earpiece into 711 (RA401), 08/29/2022
20
Vent
Occlusion reduction provided by
combination of front vent and ANC.
dB re Sealed
10
ANC
Vent + ANC
0
-10
-20
-30
10
100
Frequency (Hz)
KN2 | TWS Reference Design with Consumer-Preferred Sound and ANC
1,000
10,000
2
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