Toccata Grande, Part 2

By Lars Mytting
20 Jan 1998

Notes and references

[1] This, and other data on excursion in this article are based on "SPL-generated excursion nomographs", by Siegfried Linkwitz, Speaker Builder 4/84. All the sound levels refer to full-space. Add 6 dB for half-space.

[2] Sensitivity figures must be accompanied with the room specifications too, but we will not enter that topic here.

[3] It is commonly suggested that a t-line driver should have high Q, but no complete theory for T/S parameters and t-lines has been universally accepted. Others, like Lynn Olson, claim that low Q is no drawback for a t-line. The CA25FEY has a Qts of 0.27, and does thereby correspond to Lynn's advice.

[4] The capability of the total Sd is is simplified for the clarity of the example. You must also take in account the crossover frequency. If you for example use four 18" drivers and a single 5", crossed at 70 Hz, the poor 5" will reach its limits at a stage where the 18" barely moves -- while the total Sd gives another impression.

[5] Vance Dickason, in "The Loudspeaker Cookbook"

[6] Martin Colloms, in "High Performance Loudspeakers"

[7] Every home should have a simple tone generator. They are available as kits at very low cost, and are extremely useful for a wide range of DIY-speaker purposes.

[8] Again we trust "SPL-generated excursion nomographs" by Siegfried Linkwitz, Speaker Builder 4/84.

About the
author

Print this
article

Email this
article