Specification AgeRangeDescription : Adult AudioDriverType : dynamic_driver AudioOutputMode : Surround Brand : HiQltyla BulletPoint1 : 【Port Tubes Function】speaker exposes the speaker diaphragm to produce sound, and there is also vibration at the back of the speaker. After installing the port tubes,as the diameter of the port tubes is smaller than the diameter of the speaker, a relatively strong sound wave will rush out of the inverted tube. the sound waves towards the front and back of the speaker are utilized, Improve the sound quality of the speaker BulletPoint2 : 【Dimensions】Outer diameter (including Flange): 67mm/2.64", Maximum inner diameter:53mm/2.09", Minimum inner diameter:52mm/2.05", Length:24mm/0.94" BulletPoint3 : 【Speaker Cabinet Vent Diameter】Fit for most brands of PA/DJ Subwoofer Bass Speaker Cabinets Box Vent, Cabinet Cutout: 2" BulletPoint4 : 【How to Choose Size】Set the cross-sectional area of the Port Tubes as S1, the effective vibration area of the bass horn as S2, and S1=(0.1-0.4) S2 is the optimal. Port Tubes length LV=(1.463 * 107R ^ 2)/(FB2VB) -1.463R, among them: LV is the length of the port tubes, R=the opening radius of the port tubes, all in inches; FB is the tuning frequency, in Hz; VB is the volume of the sound system, measured in cubic inches BulletPoint5 : 【Package Includes】2" x 1" Speaker Port Tubes - 2Pack Color : black CompatibleDevices1 : Home Theater CompatibleDevices2 : Karaoke Machine CompatibleWithVehicleType : Car ConnectivityTechnology : Coaxial ControlMethod : touch CustomerPackageType : FFP ExternallyAssignedProductIdentifier : 7447930133898 ExternallyAssignedProductIdentifier1 : 0768795962872 ExternallyAssignedProductIdentifier2 : 768795962872 GpsrSafetyAttestation : 1 IncludedComponents : 2" x 1" Speaker Port Tubes - 2Pack IsWaterproof : FALSE ItemName : Speaker Cabinet Port Tubes for PA/DJ Speaker Cabinets Subwoofer Bass Reflex Tube Bass Box Vent, 2" Diameter, 1" Length - 2Pack ItemPackageDimensions_Height : 15.1892 centimeters ItemPackageDimensions_Length : 2.8956 centimeters ItemPackageDimensions_Width : 10.3124 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : port-tubes Manufacturer : HiQltyla Material : Acrylonitrile Butadiene Styrene (ABS) ModelName : SCPT-2"x1" ModelNumber : SCPT-2"x1" MountingType : Wall Mount NumberOfBoxes : 1 NumberOfCircuits : 2 NumberOfItems : 2 NumberOfPowerLevels : 1 PartNumber : SCPT-2"x1" PowerSourceType : Corded Electric ProductDescription : Speaker Cabinet Port Tubes Model: SCPT-2"x1" Compatible with most brands of PA/DJ Subwoofer Bass Speaker Cabinets Box Suggest Cabinet Cutout: 2.09" Condition: New Color: Black Material: Plastic Outer diameter (including Flange): 67mm/2.64" Maximum inner diameter: 53mm/2.09" Minimum inner diameter:52mm/2.05" Length: 24mm/0.94" How to choose the speaker cabinet port tubes at suitable size? 1.Set the cross-sectional area of the Port Tubes as S1, the effective vibration area of the bass horn as S2, and S1=(0.1-0.4) S2 is the optimal. according to the calculation formula, the cross-sectional area of 2" Port Tubes fit for 3.5", 4", 5" and 6" Bass Speaker 2.Port Tubes length LV=(1.463 * 107R ^ 2)/(FB2VB) -1.463R, among them: LV is the length of the port tubes, R=the opening radius of the port tubes, all in inches; FB is the tuning frequency, in Hz; VB is the volume of the sound system, measured in cubic inches Note: The dimensions of these Port Tubes are all manually measured, which may result in some slight errors. Please measure and confirm again after receiving the goods to ensure that the speaker cabinet cutout is just right. If the cutout is too large, you can use some glue to fix it Package Includes: 2" x 1" Speaker Port Tubes - 2Pack ProductSiteLaunchDate : 2023-05-15T03:43:38.115Z RecommendedUsesForProduct : For Surround Sound Systems Size : 2"x1" SpeakerAmplificationType : Passive SpeakerSize : 2 inches SpeakersMaximumOutputPower : 10 watts SpeakerType : Subwoofer SpecificUsesForProduct : Surround Sound Systems Style : Fine SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 SurroundSoundChannelConfiguration : 2.0 TargetGender : unisex UnitCount : 2 UnspscCode : 52161500 WarrantyDescription : 1 year manufacturer WarrantyType : limited warranty