Not another bleeding omni FFS!

Dedicated to those large boxes at one end of the room
simon
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#46 Re: Not another bleeding omni FFS!

Post by simon »

Oh no, they're firmly on the ground floor!
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#47 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Here is the finalised retro design drawing for these speakers.
all sorts of influences in there.
Top box definitely smacks of Mr Exeter's Interocitor.

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#48 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Tried the bare boxes on their backs with a couple of bath towels thrown inside each one and a 2nd order, low pass crossover at 200Hz.
The results were highly promising, both with music and the pink noise analysis. Not sorted by any means but as I said...promising.

Removing the bath towels from the cabs and playing music was highly entertaining. Haven't heard bass like that since my Dad's KB radiogram back in the 60s. And no that's not a compliment. :lol: :lol: :lol:

But..... the design once the cabs are properly braced and damped is definitely a goer, and that is the main thing at this stage of the proceedings.
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#49 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

OK another bleeding redesign is now in progress.
We're all used to it and I'll be back in a short while with something else.
Don't get me wrong, the existing design is a goer but I'm not happy. And if I'm not happy
then it's my perogative to rethink.
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#50 Re: Not another bleeding omni FFS!

Post by chris661 »

Ooo-er. That's a shame, Steve. No chance of fixing it?

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#51 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Well it can be sorted but IMO it is not worth the bother, plus the missus is not having it :lol:

However, I have something else that is even better; something I discovered when auditioning the 10FE200 10 inch driver running wide open. Let's just say for the moment that it would be a criminal waste to use it as a bass only driver.

The look is similar to a Metronome (which has after all, become my "brand" signature design) still semi-omni, and the retro styling from a few posts ago will be more or less intact, so it is highly encouraging going forward.

Drawings soon.
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#52 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

There you go:

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andrew Ivimey
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#53 Re: Not another bleeding omni FFS!

Post by andrew Ivimey »

Well I like them!
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#54 Re: Not another bleeding omni FFS!

Post by Thermionic Idler »

Yes, that's better.
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#55 Re: Not another bleeding omni FFS!

Post by IslandPink »

Nice styling !
So are we looking at a 2-way now ?
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#56 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Thermionic Idler wrote: Thu Aug 03, 2017 10:46 pm Yes, that's better.
A bit more elegant now. :D
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#57 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

IslandPink wrote: Thu Aug 03, 2017 11:44 pm Nice styling !
So are we looking at a 2-way now ?
Yes,
The 10 inch driver has such a good midrange response that it would be plain daft to restrict it to bass duties.
The 45 deg, off-axis rolloff is also pretty nice; perfect for a semi-omni design; better even than the 6PR110.

The quarter wave line I have worked up, will easily give bass down to 30Hz when floor and rear wall loaded, which is exactly what I wanted from this bigger design, to give more scale to the presentation.

TO be perfectly honest, the down-firing' quarter-wave expanding transmission line is, for me, one of the best methods of getting deep, even, uncoloured bass, in a small to medium sized living room. There is nothing not to like about them in my experience.

I'll put some construction drawings up sometime this weekend.
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Dr Bunsen Honeydew
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#58 Re: Not another bleeding omni FFS!

Post by Dr Bunsen Honeydew »

I find any line or port causes a phase (musical timing problem), so I wont use them, but I have an open mind, you might have solved that, you never know.

I am a sealed box man. Or just maybe with some persuasion an open baffle man, but not commercially.
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#59 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Dr Bunsen Honeydew wrote: Fri Aug 04, 2017 2:31 pm I find any line or port causes a phase (musical timing problem), so I wont use them, but I have an open mind, you might have solved that, you never know.

I am a sealed box man. Or just maybe with some persuasion an open baffle man, but not commercially.
Firing the line exit at the floor tightens things up considerably at the bottom end, I have found from my own experiments.
It works even better with up-firing semi-omnis than it does with my front facing Metronomes. Probably to do with the sound firing in exact opposite vertical directions, not setting off the room and also the lack of rocking motion being generated, by said same process. Whatever it is, it works well.
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Dr Bunsen Honeydew
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#60 Re: Not another bleeding omni FFS!

Post by Dr Bunsen Honeydew »

It is only partly how and when it is released from a line, the main problem is the line itself, especially if it has damping or foam in it which store and release information unpredictably.

There is a reason why infinite baffle has the *tightest* bass of any enclosure, note not the deepest. For me tightest means musical timing, and the bass is largely from the bass instrument and along with drums are the rhythm section of any band group or orchestra. Get the timing wrong there and the music falls apart.
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