The ClearSonic LidPacs are designed to substantially reduce sound that would normally escape upwards. LidPacs are especially helpful in spaces with high ceilings. We made sure that many of the same great features that have made the ClearSonic Panels and SORBER famous can also be found in our LidPacs. LidPacs are portable, durable, cost effective, and simple to set up and take down.LidPac 5-3 - (1) STC5, (2) STS5, (1) BAR - 5.5' deep x 6' wide, 3-section lidLidPac 5-4 - (1) STC5, (1) STC512, (2) STS5, (2) BAR - 5.5' deep x 7' wide, 4-section lidLidPac 4-3 - (1) STC4, (2) STS4, (1) BAR - 4' deep x 6' wide, 3-section lidLidPac 5-3 is used in IsoPac B and IsoPac E. LidPac 5-4 is for larger systems like the MegaPac, MiniMega, and IsoPac A. LidPac 4-3 is used in smaller vocal booths IsoPac F and H. The LidPacs consist of rectangular center sections, and trapezoid side sections. The STC5 and STS5 panels are 5.5' long, while the STC4 and STS4s are 4' long. Each lid section is 2' wide. If your enclosure is larger than 6' across, an additional 1' wide center section (STC412 or STC512) can be added. LidPacs utilize a light weight yet sturdy telescoping aluminum bar that attaches to the acrylic with hooks to provide support for the lid sections. The ClearSonic LidPacs require the use of an A5-6 or larger CSP. The AX12 or AX18 Height Extenders are recommended to provide additional headroom under the lid. FeaturesHigh quality making and superior finishSpecificationsColor: Dark GrayProtocols: TCP/IP, UDP, RTP, SIP, DHCP, MulticastWeight: 43 lbs