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jessie.dazzle wrote:

Hi Klaus, Spec sheet on the bass driver you plan to use here: http://www.greatplainsaudio.com/downloads/515_G.pdf

got it, thx. used this data to simulate in hornresponse,looks very promising. but i know...its just a simulation........

jessie.dazzle wrote:

Throat diameter : 9.9 inches ? I'm just a beginner, and will refrain from writing about things I haven't proven for myself (I have only "proven it" in the case of the upper bass horns), but if you haven't already done so, read the following thread (scroll down to the paragraph near the image of the black JBL enclosure): http://www.goodsoundclub.com/Forums/ShowPost.aspx?postID=806#806

whats wrong with 9,9"? its rougly 55% of sd? you think, 43" is too short for a 62hz horn?
btw, i follow your project with interest! i searched this forum since weeeks before asking stupid questions;-). sometimes its hard to understand...the language...

jessie.dazzle wrote:

Crossing the bass horn at 500Hz to an S2 : If using a 6dB/octave slope, I might start to get a bit nervous about running an S2 that low. I use one pair of S2s to cover a theoretical 800Hz to 3200Hz into a 180Hz Tractrix, and have heard no signs of distress at all (still need to measure the output and see where it is really rolling off when taking into account the combined effects of the horn+room). The diaphragms you describe seem to be one of the later versions, which are referred to as the "plastic-suspended" variety.

will try 2nd order at 500, but also 700 1st order. we will see. the diaphragma, please look at my reply to romy!
i would like to try different diaphragmas( especially the real metals, my instinct tells me they would sound very good with my poweramps), but as you know, they are difficult to find and expensiv, my budget is limited. same for the alnicos, the price is 50% higher, no easy decision for me.

thx, klaus

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