Hi-Vi D6.8 Best thing to do with them? - diyAudio
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Old 20th August 2013, 05:50 PM   #1
jerryo is offline jerryo  Isle of Man
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Default Hi-Vi D6.8 Best thing to do with them?

I just purchased 8 Hi-Vi D6.8 mid bass drivers for a reasonable price so I was just wondering what would be the best thing to do with them.
Try and emulate the Mani-2 for instance!
I would like a recommendation for a suitable tweeter to go with them of possible. They are not very efficient,, so how would 4 of these per speaker
(non -Isobaric) with a suitably efficient tweeter sound.
I'm toying with the idea of laminating the cabinets internally with lead sheet, especially on the larger panels and the baffle.
They do model well in WIN isd for bass extension. Maybe not in volume but that's not an issue for me. (neighbours etc)

What do you think?
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Old 21st August 2013, 01:41 AM   #2
Jay1111 is offline Jay1111  United States
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There's this design

http://www.htguide.com/forum/showthr...highlight=neoD

You'll have to ask Jon Marsh which tweeter to use though.
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Old 21st August 2013, 07:07 AM   #3
jerryo is offline jerryo  Isle of Man
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Thanks for the link Jay1111, but I will have to join the htguide forum to view it. I will do so however.
Any body else completed a build using these drivers?
Cheers
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Old 21st August 2013, 07:09 AM   #4
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Lookup "Shrubbery" over on PETT. Uses a Seas DXT tweeter with it, and Scott knows his stuff.
Very smooth and easy on the ears.
Later,
Wolf
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Old 21st August 2013, 09:22 AM   #5
jerryo is offline jerryo  Isle of Man
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Hi wolf_teeth,
excuse my ignorance, but what is PETT?

Nice word "shrubbery"
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Old 21st August 2013, 12:54 PM   #6
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Default Mani-2 clone

Hi Jerryo!

I've noticed that you are thinking about a Mani-2 clone with the Hi-Vi D 6.8-s.
Actually I've built that thing last year (but unfortunately sold them....), and I can tell you, that with a modified Vifa XT25 TG30 tweeter they sound actually better than the Mani-2-s did (I know because I designed the M'2-s back in '92 ). Same box size and construction, slightly different tuning, different x-over. In room the low end is around 25-28 Hz, but the sensitivity is rather low (cca. 83 dB/W), also it needs LOTS of power (min 150-200W class AB power). I have some pictures of the box, and the x-over, if you want them, I cam send them to you in PM.
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Old 21st August 2013, 01:40 PM   #7
jerryo is offline jerryo  Isle of Man
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Hi dragonweed,
many thanks for your reply.
I would welcome any information at all about the original Mani-2 speakers. What sort of modification to the Vifa tweeters do you mean?
I have 8 of these drivers arriving soon so I can improve the efficiency by doubling up the bass drivers by having 2 x Isobarik pairs per speaker if that would make sense; would that be a Mani-4?!

Please do send me a PM with any information or photo's that you have or are willing to give me. It would be much appreciated.
Cross-over specification, bracing, tuning, anything at all. I have various ideas about how to use these drivers but I have read some very good reports about the Mani-2's so it would be the obvious way to go.

Cheers
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Old 21st August 2013, 07:40 PM   #8
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PETT is Parts Express Tech Talk.
Later,
Wolf
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Old 21st August 2013, 07:45 PM   #9
jerryo is offline jerryo  Isle of Man
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Got it wolf_teeth. I will check it out.

Cheers dude
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Old 25th October 2013, 11:47 AM   #10
jerryo is offline jerryo  Isle of Man
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Back again!
Like many things in life one has to prioritise, so I've been a bit "otherwise engaged" of late!

So, my broad plan at the moment is to use these eight drivers in an MTM double Isobarik set up, with an EBS -3db alignment. Got a box size and tuning from Win Isd Pro. of 29 litres and 29 Hz tuning for the vent and box. They will give me around 88db/w
The cone excursion looks good to at least 35Hz for the bass.
For the mid/high range, I'm toying with the idea of making it possible (with the same cabinet) to try two approaches.
One: use the Monacor DT 300 tweeter with the WG 300 waveguide crossed at around
2000 Hz or
Two: use a suitable 3-4" fullrange crossed at around 300 Hz (eg: Monacor Spx-32m looks interesting at the price) but a Jordan/Bandor is also a thought (power issues)
For the tweeter/fullrange I'll arrange a gas tight but removable sub-baffle between the two Isobarik pairs of the Hi Vi D6.8's There will be space available for a small enclosure behind this if required. Because of this distance requirement (200mm) between the bass drivers to allow the fullrange/waveguide I think the fullrange route might be the way to go?!
I want to keep the crossover as simple as possible which also heads in the full range direction I think.

Any thoughts on my plans? (good or bad)

Cheers
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