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Old 11th June 2018, 12:30 AM   #3981
toobhed is offline toobhed  United States
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Lovely! ...how about another pic of the front baffle?
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Old 11th June 2018, 12:49 AM   #3982
planet10 is offline planet10  Canada
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Quote:
dual Tang Band drivers in back to back transmission lines...
Very pretty.

The official term for back to back is push-push. With the bipole cabinets deeper than wide you will have a larger bipole dip than if they were wider than deep.

dave
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Old 12th June 2018, 02:50 AM   #3983
Arthur Jackson is offline Arthur Jackson  United States
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Default Bipolar Front Baffle

OK, here you go.
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Old 12th June 2018, 03:24 AM   #3984
Arthur Jackson is offline Arthur Jackson  United States
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Woops, yes they are push push, or if you are a pessimist pull pull? They sound fantastic in a larger room where the null can form. In small rooms they can be somewhat confused and instruments appear beyond the walls or even present a headphone type music in your head effect. Far-out, man. Oh, and don’t sit between them.
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Old 18th June 2018, 02:25 AM   #3985
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by planet10 View Post
?..With the bipole cabinets deeper than wide you will have a larger bipole dip than if they were wider than deep.

dave
Why?
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Old 18th June 2018, 04:53 AM   #3986
planet10 is offline planet10  Canada
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The output from the back is delayed just enuff to be out of phase kust below the bafflestep. The higher the width:depth ratio the less the size of the dip.

If you listen to a bipole that had the push=push drivers on the sides (like Tysen V2) there is no dip since the sound travels the same distance.

One can see from this that the dip is worst on-axis and decreases as you listen more off-axis, and gone if you listen 90 off-axis.

dave
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Old 25th June 2018, 02:06 PM   #3987
Nenola is offline Nenola  Finland
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Made a quick build to get some speakers to my office.

Had these 2" peerless laying around useless, put them into wooden chests (4/each), tuned them to 100hz. Made a thicker front baffle with a piece of plywood and some bitumen mat on the inside to add weight. Finally filled with polyfill and wrapped them with dc-fix. Amplified by 5 volt class-d PAM amplifier.
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Old 25th June 2018, 03:16 PM   #3988
GM is offline GM  United States
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Old 1st July 2018, 01:15 AM   #3989
torrence is offline torrence  United States
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Finally managed to finish my Bluetooth 'soundbar' for summer. This is inspired by the micro-Onken with an Alpair 6P in a 3L enclosure tuned to 70 Hz. This uses a Sure 2x25W TDA7492 ClassD amp from Parts Express which runs happily all day from 3 18650 batteries.

After the drivers broke in, this thing sounds great. If I put it near a wall, the bass is quite impressive.
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Old 1st July 2018, 01:20 AM   #3990
vdi_nenna is offline vdi_nenna  United States
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