
Part # IPA1044D-VF
Holland Electronics, 4-OUTPUT AMPLIFIER, PASSIVE DATA PORT, 4 dB GAIN FORWARD, PASSIVE REVERSE, POWER SUPPLY
Part # IPA1004DL-VF
Holland Electronics, 4-OUTPUT AMPLIFIER, PASIVE DATA PORT, PASSIVE REVERSE, LOCAL POWER PORT, POWER SUPPLY
Part # IPA1044D-RSVF
Holland Electronics, 4-OUTPUT AMPLIFIER, PASSIVE DATA PORT, 4 dB GAIN FORWARD/REVERSE, POWER SUPPLY
Part # IPA1044DS-RSVF
Holland Electronics, 4-OUTPUT AMPLIFIER, PASSIVE DATA PORT, 4 dB GAIN FWRD/REV, DATA STABILIZATION, POWER SUPPLY
Part # IPA1002
Special Pricing Available - Holland Electronics, 2-OUTPUT AMPLIFIER, FORWARD GAN 11 dB, PASSIVE REVERSE, POWER SUPPLY
Part # IPA1008D-VF
Holland Electronics, 8-OUTPUT AMPLIFIER, PASIVE DATA PORT, PASSIVE REVERSE, POWER SUPPLY
Part # IPRA1001
Holland Electronics, REVERSE AMPLIFIER, 5-42 MHz, REVERSE 10 dB GAIN, FIC DIRECT CONNECT PORT
Part # BDC1120H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 20 dB
Part # BDC1127V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 27 dB
Part # BDC1124V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 24 dB
Part # BDC1124H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 24 dB
Part # BDC1120V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 20 dB
Part # BDC1116V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 16 dB
Part # BDC1109RW
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, RACEWAY, 09 dB, 1 GHZ
Part # BDC1130H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 30 dB
Part # BDC1130V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 30 dB
Part # LPF-1002-70 Filter
Holland Electronics MoCA POINT OF ENTRY FILTER, > 70 dB REJECTIN
Part # BDS104FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS103FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS102HP
Holland Electronics, BROADBAND DIGITAL SPLITTER - 2-WAY, HORIZONTAL, POWER PASSING
Part # BDS104HP
Holland Electronics, BROADBAND DIGITAL SPLITTER - 4-WAY, HORIZONTAL, POWER PASSING
Part # BDS208H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, HORIZ, 5 - 1002 MHZ, MOCA 1125 - 1675MHZ
Part # BDS203VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS208VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDPS1612VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 6 dB Data Port, 2 RF Ports, Vertical True Flex
Part # BDPS1615VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 6 dB Data Port, 5 RF Ports, Vertical True Flex
Part # BDPS1912VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9dB Data Port, 2 RF Ports, Vertical True Flex
Part # BDPS1913VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9dB Data Port, 3 RF Ports, Vertical True Flex
Part # BDPS1914VF
Holland Electronics, 'Broadband Digital Data Plus Splitter, 1 9dB Data Port, 4 RF Ports, Vertical True Flex
Part # BDPS1915VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9 dB Data Port, 5 RF Ports, Vertical True Flex
Part # POE-S203VF
Holland Electronics, BROADBAD DIGITAL , 3-Way, POE FILTER, True Flex
Part # BDILA – In Line Attenuator
Special Pricing Available - In Line Attenuator - Power Blocking/Passing Available, 1dB - 20dB
Part # Holland Electronics104TP – Topless Splitter
Special Pricing Available - RF Passive, 4 Output, 1.2GHz, RoHS, Quickmount
Part # TFC-dsh10026r – 2-Way Splitter
Special Pricing Available - RF Splitter, 2-Output, 5-42, 1GHz
Part # TFC-dsh10036r u[1] – 3 Way Splitter – Unbalanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Unbalanced
Part # TFC-dsh10046r – 3-Way Slitter – Balanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Balanced
Part # TFC-dsv10036r – 3-Way, Vertical, Unbalanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Unbalanced, Vertical
Part # Ground Block – G-G2B2
Holland Electronics, BONDING BLOCK, 1-OUTPUT, UL LISTED, DIE CAST
Part # F-Splice
F-Splice, 3GHz Operation, Brass
Part # DS – G-PF-59 Lab Quality Push On Adapter – 65-0174 Rev. 1.0
The G-PF-59 is a high-performance push-on F-connector adapter.
Part # Feed-Thru Connector F81CPBC – F81CP1NW
Feed-Thru F Connector, Circumference Premium Contact, Brass
Part # BDS102HP
Holland Electronics, BROADBAND DIGITAL SPLITTER - 2-WAY, HORIZONTAL, POWER PASSING
Part # BDS102H
Holland Electronics, BROADBAND DIGITAL SPLITTER - 2-WAY, HORIZONTAL
Part # BDS106FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 6 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS106VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 6-WAY, VERTICAL TRUE FLEX
Part # BDS104FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS104VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, VERTICAL TRUE FLEX
Part # BDS103FVFB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3 OUTPUT, BALANCED, 5-13 MHz FILTER
Part # BDS103VFB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, BALANCED, VERTICAL TRUE FLEX
Part # BDS103FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS103VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, VERTICAL TRUE FLEX
Part # BDS102FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS116H
Holland Electronics, BROADBAND DIGITAL SPLITTER - 16-WAY, HORIZONTAL
Part # BDS108H
Holland Electronics, BROADBAND DIGITAL SPLITTER - 8-WAY HORIZONTAL
Part # BDS104HP
Holland Electronics, BROADBAND DIGITAL SPLITTER - 4-WAY, HORIZONTAL, POWER PASSING
Part # BDS104H
Holland Electronics, BROADBAND DIGITAL SPLITTER - 4-WAY, HORIZONTAL
Part # BDS103HP
Holland Electronics, BROADBAND DIGITAL SPLITTER - 3-WAY, HORIZONTAL, POWER PASSING
Part # BDS103HB
Holland Electronics, BROADBAND DIGITAL SPLITTER - 3-WAY, HORIZONTAL, BALANCED
Part # BDS103H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY HORIZONTAL
Part # BDS102RW
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, RACEWAY, 1 GHZ
Part # BDS102VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERTICAL TRUE FLEX
Part # BDS208VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS1202H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, HORIZ, 5-1218 MHZ
Part # BDS1203H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, HORIZ, 5-1218 MHZ
Part # BDS1203HB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, HORIZ, 5-1218 MHZ
Part # BDS1204H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, HORIZ, 5-1218 MHZ
Part # BDS1208H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, HORIZ, 5-1218 MHZ
Part # BDS1202VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 5-1218 MHZ
Part # BDS1203VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, VERT, 5-1218 MHZ
Part # BDS1203VFB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY BAL, VERT, 5-1218 MHZ
Part # BDS203VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS202VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS208H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, HORIZ, 5 - 1002 MHZ, MOCA 1125 - 1675MHZ
Part # BDS204H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, HORIZ, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS203H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, HORIZ, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS202H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, HORIZ, 5-1002MHZ, MOCA 1125 - 1675MHZ
Part # BDS108FVF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8 OUTPUT, WITH 5-13 MHz FILTER
Part # BDS108VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, VERTICAL TRUE FLEX
Part # BDS204VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, VERT, 5 - 1002 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics1208VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # BDPS1615VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 6 dB Data Port, 5 RF Ports, Vertical True Flex
Part # BDPS1612VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 6 dB Data Port, 2 RF Ports, Vertical True Flex
Part # BDPS1614VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 6 dB Data Port, 4 RF Ports, Vertical True Flex
Part # BDPS1912VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9dB Data Port, 2 RF Ports, Vertical True Flex
Part # BDPS1913VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9dB Data Port, 3 RF Ports, Vertical True Flex
Part # BDPS1914VF
Holland Electronics, 'Broadband Digital Data Plus Splitter, 1 9dB Data Port, 4 RF Ports, Vertical True Flex
Part # BDPS1915VF
Holland Electronics, Broadband Digital Data Plus Splitter, 1 9 dB Data Port, 5 RF Ports, Vertical True Flex
Part # IPGSM04D-VF
Holland Electronics, MoCA GATEWAY SPLITTER
Part # IPGH3M4-VF
Holland Electronics, GATEWAY PASIVE, 1002 MHZ, 3 HYBRID PORTS, 4 MoCA PORTS, TRUE FLEX HOUSING
Part # Holland Electronics1203VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics1202VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics1208H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, HORIZ, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics1204H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, HORIZ, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics1203H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, HORIZ, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics2202H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, HORIZ, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # BDS1208VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 8-WAY, VERT, 5-1218 MHZ
Part # BDS1206VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 6-WAY, VERT, 5-1218 MHZ
Part # BDS1204VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, VERT, 5-1218 MHZ
Part # Holland Electronics1204VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, 6KV RING/COMBO, 5 - 1218 MHZ, MOCA 1125 - 1675 MHZ
Part # Holland Electronics2203H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, HORIZ, MOCA, 5-1.218 GHz
Part # Holland Electronics2204VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, VERT, MOCA, 5-1.218 GHz
Part # Holland Electronics2204H
Holland Electronics, BROADBAND DIGITAL SPLITTER, 4-WAY, HORIZ, MOCA, 5-1.218 GHz
Part # Holland Electronics2203VFB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY BAL, VERT, MOCA, 5-1.218 GHz
Part # Holland Electronics2203VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY, VERT, MOCA, 5-1.218 GHz
Part # Holland Electronics2203HB
Holland Electronics, BROADBAND DIGITAL SPLITTER, 3-WAY BAL, HORIZ, MOCA, 5-1.218 GHz
Part # Holland Electronics2202VF
Holland Electronics, BROADBAND DIGITAL SPLITTER, 2-WAY, VERT, MOCA, 5-1.218 GHz
Part # POE-S203VF
Holland Electronics, BROADBAD DIGITAL , 3-Way, POE FILTER, True Flex
Part # POE-S202VF
Holland Electronics, BROADBAD DIGITAL , 2-Way, POE FILTER, True Flex
Part # Holland Electronics104TP – Topless Splitter
Special Pricing Available - RF Passive, 4 Output, 1.2GHz, RoHS, Quickmount
Part # TFC-dsh10026r – 2-Way Splitter
Special Pricing Available - RF Splitter, 2-Output, 5-42, 1GHz
Part # TFC-dsh10036r u[1] – 3 Way Splitter – Unbalanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Unbalanced
Part # TFC-dsh10046r – 3-Way Slitter – Balanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Balanced
Part # TFC-dsv10036r – 3-Way, Vertical, Unbalanced
Special Pricing Available - RF Splitter, 3-Output, 5-42, 1GHz, Unbalanced, Vertical
Part # Holland Electronics 1200H/VF Horizontal & TrueFlex™ Broadband Digital Splitter Series
Zinc die cast housing and fully soldered back ensure the best electrical performance in a variety of splitter types and outputs. Precisely engineered electrical components and materials guarantee peak performance in every condition, location, and environment. Broadband digital splitters are designed to meet the highest technical performance in the broadband industry. Trust your network with the Holland Electronics Digital Splitter.
Part # Linear Series Broadband Digital Splitters & Taps
Linear Digital Splitters and Taps are the industry optimum DOCSIS 3.1 ready passive products. Providing future proof RF performance and long-term reliability through design excellence, innovation and quality manufacturing. Zinc die cast housing and fully soldered back ensure the best electrical performance in a variety of splitter and tap types and outputs. Precisely engineered electrical components and materials guarantee peak performance in every condition, location and environment. Trust your network with Holland Electronics Digital Splitters and Taps.
Part # BB1SP
Holland Electronics, BONDING BLOCK, SURGE PROTECTED, INTEGRATED MoCA POINT OF ENTRY FILTER
Part # POE-BB1SP-VF
Holland Electronics, BONDING BLOCK, SURGE PROTECTED, INTEGRATED MoCA POINT OF ENTRY FILTER, TRUE FLEX HSG
Part # Ground Block – G-G2B2
Holland Electronics, BONDING BLOCK, 1-OUTPUT, UL LISTED, DIE CAST
Part # POE70-BB1SP-C / WS
The POE70-BB1SP-C and POE70-BB1SP-C-WS integrates a MoCA POE filter and surge protected bonding block into a unique cylindrical housing. This provides high insertion loss at the MoCA frequencies to isolate the MoCA home network from the CATV plant while providing protection for subscriber terminal equipment from high voltage transient conditions.
Part # CPI-DG-CE Barrel Isolator
The CPI-DG-CE is a double-galvanic barrel isolator, capable of fully isolating the in-home network from harmful voltages that could be present on the external CATV network.
Part # Holland Electronics-CMDR-IL-1
CleanFreq Holland Electronics-CMDR-IL-1 INLINE CHOKE
Part # DPD2
SATELLITE DIPLEXER, 2A, ECHO STAR APPROVED, PREMIUM GRADE
Part # HPF-54HR
HIGH PASS FILTER, SLIM LINE DESIGN HIGH RETURN LOSS
Part # LPF-1002-70 Filter
Holland Electronics MoCA POINT OF ENTRY FILTER, > 70 dB REJECTIN
Part # MPOE-TM
Holland Electronics, MoCA POINT OF ENTRY FILTER, > 40 dB REJECTION
Part # POE-F201C
Special Pricing Available - Holland Electronics, MoCA POINT OF ENTRY FILTER, > 40 dB REJECTION, 6 kV COMBO, 6KA RING, WEATHER SEAL
Part # STVC
Holland Electronics, SATELLITE DIPLEXER, 2150 MHz
Part # BDILA – In Line Attenuator
Special Pricing Available - In Line Attenuator - Power Blocking/Passing Available, 1dB - 20dB
Part # F-Splice
F-Splice, 3GHz Operation, Brass
Part # DS – G-PF-59 Lab Quality Push On Adapter – 65-0174 Rev. 1.0
The G-PF-59 is a high-performance push-on F-connector adapter.
Part # Feed Thru Connector G-F81XL
Holland Electronics has advanced the traditional F-splice technology with a patented design offering a higher level of electrical and mechanical features. The advanced features provide increased return loss beyond 3 GHz, more than twice the pin contact area and increased holding force for higher current handling and greater reliability.
Part # POE – LPF-1002-70-SS
This is a new design, available only for limited use in networks intending to improve MoCA security by enhancing the isolation of the POE filter to 70 dB. The higher isolation ideally attenuates MoCA signals, which can egress out of a customer’s home, to below the noise floor, assuming this filter is installed within the customer’s premises.
Part # POE70-BB1SP-C / WS
The POE70-BB1SP-C and POE70-BB1SP-C-WS integrates a MoCA POE filter and surge protected bonding block into a unique cylindrical housing. This provides high insertion loss at the MoCA frequencies to isolate the MoCA home network from the CATV plant while providing protection for subscriber terminal equipment from high voltage transient conditions.
Part # BDC1104H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUPUT, HORIZONTALL, 04 db
Part # BDC1127V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 27 dB
Part # BDC1127H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 27 dB
Part # BDC1124V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 24 dB
Part # BDC1124H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 24 dB
Part # BDC1120V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 20 dB
Part # BDC1120RW
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, RACEWAY, 20 dB, 1 GHZ
Part # BDC1120H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 20 dB
Part # BDC1116V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 16 dB
Part # BDC1116H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 16 db
Part # BDC1112V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 12 db
Part # BDC1112RW
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, RACEWAY, 12 dB, 1 GHZ
Part # BDC1112H
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, HORIZONTAL, 12 dB
Part # BDC1109V
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, VERTICAL, 09 dB
Part # BDC1109RW
Holland Electronics, BROADBAND DIGITAL DC - 1-OUTPUT, RACEWAY, 09 dB, 1 GHZ
Part # BDC1109H
Holland Electronics, BROADBAND DIGITIAL DC - 1-OUTPUT, HORIZONTAL, 09 dB