I'm thinking of taking one of my subwoofers outside and making some listening tests. Any suggestions on tracks to listen to, preferably on Spotify? I'm guessing good acoustic recordings should sound nice.
I'll do some recordings as well
/Anton
Thumb up you also share recordings will look forward, regarding tracks think doesn't matter so much pick the ones with personal good relation.
I've been listening outdoors with a subwoofer (8" Tangband W8-740P tuned to 27 Hz) and I'm blown away! Both by the sound and how obvious the high directivity is, even my SO was impressed 
Here's the XO between subwoofer and speaker:
Distortion at ~90 dB which was the high level I listened at (otherwise at ~80 dB):
Here's a plot I haven't showed earlier, Group delay:
And I promised to show how the frustumized holes look like, so here's a pic:
I read in Legis thread (here) that it could be a good idea to add damping in the front chamber (between cone and horn wall). So I tried that:
Here's woofer response without damping:
And here with the added damping:
No huge difference, the resonances outside the passband are slightly more attenuated and output around 1 kHz is also down a few dB. Maybe the volume that I can fill is too small to have any significant impact.
/Anton
Here's the XO between subwoofer and speaker:
Distortion at ~90 dB which was the high level I listened at (otherwise at ~80 dB):
Here's a plot I haven't showed earlier, Group delay:
And I promised to show how the frustumized holes look like, so here's a pic:
I read in Legis thread (here) that it could be a good idea to add damping in the front chamber (between cone and horn wall). So I tried that:
Here's woofer response without damping:
And here with the added damping:
No huge difference, the resonances outside the passband are slightly more attenuated and output around 1 kHz is also down a few dB. Maybe the volume that I can fill is too small to have any significant impact.
/Anton
Attachments
The damping does however seem to affect the CSD in a positive way:
No damping (0.5 ms rise time):
With damping:
I felt like testing the linearity of the speaker so I measured at 85, 90 and 95 dB (1 m, 15 deg):
Looks good around these levels. Here's distortion for the three measurements:
/Anton
No damping (0.5 ms rise time):
With damping:
I felt like testing the linearity of the speaker so I measured at 85, 90 and 95 dB (1 m, 15 deg):
Looks good around these levels. Here's distortion for the three measurements:
/Anton
Attachments
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Ain't that the truth!
I've got a pair of these coming to try and build the smallest synergy yet....
https://www.madisoundspeakerstore.com/ribbon-tweeters/audiopur-pla200-6-planar-ribbon-tweeter-200mm/
If the specs are accurate, should be a very interesting outcome. Might wind up with a cube foot synergy.
I've got a pair of these coming to try and build the smallest synergy yet....
https://www.madisoundspeakerstore.com/ribbon-tweeters/audiopur-pla200-6-planar-ribbon-tweeter-200mm/
If the specs are accurate, should be a very interesting outcome. Might wind up with a cube foot synergy.
Great work there Onni. They must sound fantastic. They sound so good you don't want to stop listening - that is how I recall hearing my Trynergies for the first time.
I am back to listening to my xBush bookshelf horn now that I sorted out that anomalous bass boost from SRS. Here is how mine measure at present:
I am back to listening to my xBush bookshelf horn now that I sorted out that anomalous bass boost from SRS. Here is how mine measure at present:
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The BG speakers aren't really a good candidate for a synergy. The neo 3 is so large, you wind up with a throat that's too big.
I guess you could use a neo8 as a Synergy midrange, but there are way more affordable options.
On second thought, the neo3 might work well; there was someone who horn loaded it here with good results.
I cant help but wonder could you make a larger horn for the TPL-150 and add mids to that for a SH?
I know there are limitations but I love the AMT sound over CD and am curious. I will be trying my hand at a few CD/small mid combos for my SH first but am hoping it is possible with a AMT. Huge throat though so maybe not.
I know there are limitations but I love the AMT sound over CD and am curious. I will be trying my hand at a few CD/small mid combos for my SH first but am hoping it is possible with a AMT. Huge throat though so maybe not.
Something to be consider -
The Synergy mids or woofers do apply lower frequency pressure to the throat of their horn. It is somewhat like the effect of a LF driver on a big baffle onto another driver very nearby on the same baffle, but worse because the horn shape will concentrate it some.
If the higher frequency driver at the throat has a some stiffness from trapped air behind it and/or from a very stiff suspension (i.e., like a compression driver) then it doesn't cause a big problem. With a compression driver, the diaphragm resists getting pushed around.**
With a ribbon driver.... not so much.
**Still, Danley also uses an inductor across the HF driver as his last crossover component to short out EMF from low frequencies helping to stiffen the compression driver more. (His stuff is for very high SPL, though, so not the same situation as a living room).
The Synergy mids or woofers do apply lower frequency pressure to the throat of their horn. It is somewhat like the effect of a LF driver on a big baffle onto another driver very nearby on the same baffle, but worse because the horn shape will concentrate it some.
If the higher frequency driver at the throat has a some stiffness from trapped air behind it and/or from a very stiff suspension (i.e., like a compression driver) then it doesn't cause a big problem. With a compression driver, the diaphragm resists getting pushed around.**
With a ribbon driver.... not so much.
**Still, Danley also uses an inductor across the HF driver as his last crossover component to short out EMF from low frequencies helping to stiffen the compression driver more. (His stuff is for very high SPL, though, so not the same situation as a living room).
I am hoping the AMT is much stronger. In theory, to me at least, it seems like a much more rigid design. I am mainly thinking of the TPL-150/200. They do have a horn for that design already and I would try to copy that and extend the horn.
Thanks Bwaslo I didnt realise about the pressures that a tweeter has to absorb while being in the SH. It will take me a few more months until I can even start my try.
I was looking at buying a pair of TPL-150's for my future 3way build anyways. I might just buy a single TPL-200 for the SH attempt. Would be amazing if I could pull it off. I think the 150 would probably more than enough for my SPL wants but figured the 200 has more power handling and may be more robust in all other forms.
Thanks Bwaslo I didnt realise about the pressures that a tweeter has to absorb while being in the SH. It will take me a few more months until I can even start my try.
I was looking at buying a pair of TPL-150's for my future 3way build anyways. I might just buy a single TPL-200 for the SH attempt. Would be amazing if I could pull it off. I think the 150 would probably more than enough for my SPL wants but figured the 200 has more power handling and may be more robust in all other forms.
I have read through this great thread many times. I bought two of these: https://www.soundimports.eu/en/scan-speak-r2604-833000.html and I have some nice vintage Isophon AlNiCo woofers of 170 mm diameter that should work together in a living room sized synergy pair.