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Mini Scoops - Reality check

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odc04r View Drop Down
Old Croc
Old Croc

Joined: 12 July 2006
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2017 at 9:17am
Looking pretty good, if you're happy with it then great. At some point a swept response measurement is going to stop providing much help. It can't tell you anything about delay or harmonics for a start, the ears start to come into their own at that point. 

MEng always a sensible choice, opens up the door to CEng which is always a career winner if you're capable. It's not really that hard to get as long as you land a decent position out of Uni either. I did an MEng back in 2000, followed it with a PhD. In hindsight should have gone for the CEng instead but that's life for you. Things are going ok... And electronics/sound stays a hobby which keeps it fun.
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Diaz View Drop Down
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Joined: 09 November 2011
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Diaz Quote  Post ReplyReply Direct Link To This Post Posted: 10 April 2017 at 12:53pm
Originally posted by fatfreddiescat fatfreddiescat wrote:

The green plot looks like the lower tuned response from restricting the throat, it also looks like a more damped response but has more output? In the long run your ears are what counts in my book.
Adding some damping to the rear chamber will from my experience add to that lush deep bass sound by absorbing some of the upper harmonics etc, looking good Smile

Yes you are right. The green one is the one with the tighter throat.
We decided first to go with the more open/looser throat as the sound had less overtones/distortion.
After the last session i found that i can eliminate the 95Hz Peak causing the overtones quite good by using a steep filter around that frequency.
As the Measurement proclaims ~1db more in the tight throat version i will try the tighter version again and even try to make the throat even tighter. lets see what that does. I expect more damping, probably higher output and much more distortion around 80-90Hz but as we use them from 28Hz-65Hz this wont be a relevant factor.
Especially the damping is an issue as the cone movement around 65Hz is still very x-max touching.
I think that we can control the Excursion at 65Hz better by trying to tune the throat than to experiment with more wadding?
Anyhow it could be that we made a mistake at measuring at different volume levels and to prove that we do it again...
Lets see....
Stereofreezed Soundsystem rebuilding Pics: https://www.facebook.com/STEREOFREEZED/photos/?tab=album&album_id=1336346346387987
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