Hi Folks,
As promised here are some measurements of the
Audio Nirvana Classic 8 driver in the CommonSense Audio Monitor MkII Speaker Enclosure. First up is the impedance response of the speaker system. The two lines show the impedance response of the speaker system with and without the baffle step compensation (BSC) filter. The flat impedance response makes for an easy load to drive with tube amplification.
Attachment:
Classic-8-Monitor-MkII-Impedance.png
The following plots show the in-room response of the speaker system. For the measurements, the speakers were positioned at a distance of 1 m from the back wall, 2 m from each other and 2 m from the listening position. The two plots show the response both with and without the BSC filter. The response is identical with the exception of about 3dB attention from the filter.
Attachment:
AN-Classic-8-Monitor-MkII-no-BSC.png
Attachment:
AN-Classic-8-Monitor-MkII-BSC.png
In hindsight, I probably should have gone with a BSC filter closer to 6dB instead of 3dB. This is a change I will make in the future and that will help balance the bass out some more.
Overall the speakers are satisfying. They would benefit with wall loading. While the bass does not go as deep as I would like, the bass that is present is very tight, accurate and fast which is very enjoyable. A larger enclosure and lower tuning frequency would help extend the lower frequency response, but would come with other compromises.
This would be an interesting driver to try with the Fostex double bass reflex enclosure for the FE206En.