1850 horn measured plots

I just saw your plots , thanks a lot for sharing your efforts with us. Really a pity you didn't put that mic on the ground, but i believe the difference under 100 Hz wouldn't be much-if any.

This is the only 1850 measurement available in the universe :-)  

What i see from the plot, is that in case of a single horn per side and in a room (yes there are people using this designs for hi-fi)  bass from 50 Hz will be awesome. Maybe the 186 can better this, because of higher Qes driver, which loads better down low. 

Does the peak at cutoff indicate a smaller than needed back chamber, a larger throat or both??

Thanks again,

greetings from Athens (Greece)

Konstantinos

If the height of the mic makes so much difference, wouldnt it be more usefull to have it the same height off the ground as an average persons height??

The point wasn't being really scientific, but to test out the equipment (1850s and the measuring software) I wanted to see how different ways of stacking affects the response.
As I said we didn't drive them hard. Amp was bridged because it was wired that way already.

Thanks for the info though, we'll try to be more accurate next time


Edited by pfly - 11 May 2009 at 7:07am

Rog Mogale wrote: Halfspace loading will give 6dB of gain, so if you postion the mic 2 meters away, which will lose you 6dB, you will end up with a 1 meter reading.

So if you wanted to measure the actual halfspace response you would keep the mic at 1 metre, or do you mean that the extra 6dB results from the halfspace loading on the mic itself.

I see now that mic on the ground makes sense to maintain the same loading conditions at all frequencies, though I'd still assume that the mic being a very short distance of the floor would make very little difference at low frequencies?

So would you say that for measuring groundplane response of bassbins mic should be close to the floor so any halfwave gain would be well out of band?

Though the plots may not be accurate in terms of overall response, i think they're useful to demonstrate the changes in response from different stacking configs...something that comes up here again and again. The results seem to follow theory at least in that respect, you can see the slight extension gained by coupling and the general response slope lifting at bottom end.