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In the Forum: Audio Discussions
In the Thread: Lowther Driver
Post Subject: How to scare you and your box.Posted by Bud on: 8/19/2007
Yoshi,
What material do you have as damping material in the box and how close is it to the Lowther? These things are incredibly transparent to what is behind them. Some things to consider.
If the damping material is within 3 inches of the cone, it will actually mass load the cone, even if it is just fiber fill. If it is rock wool or real wool, it should only be on the sides of the box, or, alternatively as a tube of material standing up in the box from top to bottom. The diameter of the tube is critical here, as is the density of material (now tightly you compress it as you roll it up).
Another approach is to find the store in the Boston area that sells automotive carpet undelayment padding. This is a man made mat, made from jillions of crinkled plastic and natural fbers with some rag also throughout. The stuff is incredibly linear and efficient. You can usually replace a 100% full fiber fill with four smaller than full panel sized pads, 3/4" thick, glued in place. I use 3M 99 spray contact adhesive for that. This store can be located by calling some of the local custom auto interior installation companies in your area. They may be more willing to sell you some than the wholesale company.
It will be interesting to see what the Lowther's become after September.
BudRerurn to Romy the Cat's Site