OBL-11, built by Craig/AU
Copyright 2012 © Troels Gravesen
Dear Troels,
I am running the DTQWT-10 side by side with OBL-11, using 30 watt tube power mono block tube pre amp, all separate power supplies. Question? Are both speakers voiced the same, the OBL-11 seems superior on male vocals, beautiful sound, (best C at Stevens ever heard).
Where the DTQWT is silky smooth on female vocals (best Eva Cassidy ever heard), different positions in room, speakers interacting c each other?? Have I done something in the build which would explain these perceived differences, is this a function of room characteristics? Stuffing in DTQW?
Amp is borrowed ? do you still feel Jungson 88d o9 best value option ? will this again change what I think I am hearing ? looking at a15 inch woofer makes my brain think male vocals will sound different out of this speaker. Is there any area in OBL crossover worth adjusting, I am using 2.7 resistor. The DTQWT internal wool stuffing has taken some time to get right ,I wonder if I am tuning the speaker for the room? I thankyou again for your wounder ful designs, truly amazing speakers both
PS .I am shocked more people are not building the OBL 11,I think the sound has the slight edge over DTQWT and a much easier build for the beginner.
CRAIG AUSTRALIA

Hi Craig.
Yes, in principle the two speakers are voiced the same, but open baffles just do sound quite different from anything else. It's not due to stuffing of the DTQWT if done according to instructions.
I have tried several years ago to summarise some of the issues related to narrow vs wide/open baffles: http://www.troelsgravesen.dk/Acapella_WB.htm. I think this still holds water. The quotes by José Victor Henriques and Paul Messenger pretty much summarise what’s going on.
"Narrow speakers with a very wide radiation include more of the listening room and help create an illusion of bringing the musicians into the room; while more directional designs like horns and dipole panels give a precise view onto the recording itself." Read more from the link.