Email format error
Email cannot be empty
Email already exists
6-20 characters(letters plus numbers only)
The password is inconsistent
Email format error
Email cannot be empty
Email does not exist
6-20 characters(letters plus numbers only)
The password is inconsistent
Sound barriers are materials help to block sound and noise or create soundproof walls, ceilings, or enclosures for noisy equipment.
| Octave Band Frequencies (Hz) | ||||||
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
| Sound Reduction (dB) | 16 | 18 | 22 | 26 | 35 | 47 |