Looking for Best driver for 5lt/.18 cu" front vent cabinet - diyAudio
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Old 27th January 2008, 10:52 AM   #1
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Default Looking for Best driver for 5lt/.18 cu" front vent cabinet

I'm a newbie and would appreciate any help you can offer. I'm planning my own build for a 2nd room.

I've searched through the forum and could really appreciate any advice on the driver and cabinet design for my situation.

I'm looking for the best full range single driver for a front or bottom vented cabinet of approx. 5 liter/ .18 cu ft. cabinet. Price doesn't matter so much, I'll be spending a lot of time on it and want it to sound & look nice with veneer. I have the wife approval issue and need to keep cabinet small in scale. Will not be played loudly, mostly low volume.

I liked the DelSol and other similar speakers.
example 1

Example 2


nice example 3


Speaker will be for a small reading room approx. 8' ax 9'. Listening distance will be 6-7' max. They will be sitting on a very thick 6" solid Baltic birch plywood bench (16" ht.) positioned only 4" against the wall. Needs to be shielded as there is a plasma screen in the middle.

I really prefer not to have a forward/front row sound, something a bit mellower than my Totem Ones.

Read good things about the Bamboo driver. What's the latest & greatest for such a project.

Cheers,

Macgee


Photo's below from forum is another example that I like:

Click the image to open in full size.

Click the image to open in full size.
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Old 27th January 2008, 01:12 PM   #2
bredin is offline bredin  Sweden
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I don't think plasmas are sensitive for magnetic fields.
And you can screen a speaker by putting some layers of aluminium foil to the inner walls. Like a faridale cage.
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Old 27th January 2008, 09:25 PM   #3
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Thanks Bredin,

Good to know about Plasma's.

I was wondering about that, whether I needed a shielded driver or not.

Cheers
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Old 27th January 2008, 10:00 PM   #4
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Is there a link to building plans for such a speaker? 5-6 cubic liters, front or down ported.

Is there a difference in characteristics between down and front firing ports?

Cheers and thanks for the help.

Macgee
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Old 28th January 2008, 05:58 AM   #5
chrisb is offline chrisb  Canada
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Quote:
Originally posted by mr_macgee
Is there a link to building plans for such a speaker? 5-6 cubic liters, front or down ported.

Is there a difference in characteristics between down and front firing ports?

Cheers and thanks for the help.

Macgee

I'd guess that the speakers pictured are Fostex FE126 in the recommend BR design ( 10.5 liter / tuned to about 60Hz) - it's approx 85mm deeper than the single BR design for the FE127, 10liter / tuned to 71Hz. Both those designs are available at Madisound's website.


In theory there might be some advantages to a down firing port, if it's close enough to the floor - otherwise it simply makes for a more awkward stand mount- then of course there's debate over rear or front firing port. FWIW, I think the final arbiter of that question is the ultimate installation - many of the smaller designs might well fit on a bookshelf or table top flanking a TV screen, but performance of a rear port would be severely compromised, and a down firing port would be out of the question.


The FE126E is far better suited to a BLH design, and unfortunately those tend to be physically much bigger than either of the BR designs. Of course if you're intending to stand mount a little BR cabinet of any design, that's a moot point, as the total footprint of some small floorstander designs might not be any larger, and I dare say the performance of good examples of the latter would more than compensate for any extra floorspace. Enclosures such as the Mileva, PAWO, Brynn, BIB, etc immediately come to mind.

Box designs for many of those are available at

http://www.frugal-horn.com/spawn.html

and

http://www.zillaspeak.com/bib.asp



Having built more than a few of them myself, I can attest that there are quite a few "DIY" designs that easily outperform many of the Fostex "factory" designs, and in particular those for the FE126/127. For example, there are numerous designs posted on the Planet10 website Box Plans Library,

http://www.planet10-hifi.com/boxes-fostex.html

Of particular interest might be the Fonken family - most notably the first 2 on the list. The Fonken has already enjoyed quite a few DIY builds (aside from the 8 or so pairs I've built myself) - the total dimensions are not hugely greater than those of the factory BR, and within limits imposed by the driver's T/S parameters, the performance is quite superb.

Dave has a downsized Fonken design for FE127E, for which the drawings have not yet been published on his site - they give up some of the bass extension and articulation of the larger box, but are a substantially easier build. e-mail him at his website if interested
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Old 28th January 2008, 06:47 AM   #6
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Quote:
Originally posted by chrisb
a downsized Fonken design for FE127E
mFonken (milliFonken) was a stab at making the smallest possible box for the FE127. Took us 3 tries to get it right It is 4.5 liter (almost exactly the same as the BBC LS3/5A). And about the same bass extension (good to ~90 Hz).

With the necessary proximiity of the walls of the box it gives up a bit of openess compared to the larger Fonken.

Plans just need one more QC pass before they go up so i can mail the existing to anyone that wants a head start.

They are the ones in the middle.

dave
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Old 28th January 2008, 03:56 PM   #7
chrisb is offline chrisb  Canada
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On the cabinet behind the Fonken trio in Dave's picture, discerning eyes will note the latest version of CSS SDX7 mid-woofer, with optional EnABL process.

This will raise the question as to the viability of CSS FR125 in a similarly small enclosure. Aside from approx 5dB difference in sensitivity, which can be a bit of a deal breaker with low powered SET amps, and some minor differences in tonal balance, the CSS125 is a great candidate.
(smoother bass response with more gradual roll-off in an aperiodic box than BR)
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Old 29th January 2008, 04:48 AM   #8
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Quote:
Originally posted by planet10


Plans just need one more QC pass before they go up so i can mail the existing to anyone that wants a head start.

They are the ones in the middle.

dave

Hi Dave & Chrisb,

First of all; I have to say thank you for all your input that you have written in the countless posts in different forums. They have been informative & useful to myself and probably countless others.

After some reading, I have a better idea what I may need but I'm still a bit lost on deciding which driver.

I'm a newbie and my first desire is sound and the idea of making the speaker. My knowledge is low in regards to speaker design and would be very happy just to find a correct driver and a good looking cabinet for me to build. Later on I hope to learn more about design. After reading the forums, It looks like I'm not alone.

I do realize putting the speaker close the rear wall is not a good thing but I'm limited to this position, Because of this I believe I would need a forward or down ported cabinet.

I'm also limited on dimensions. The width can not be more than 7", the depth no more than 9.5", the height as high as 12".

What is the largest driver I can have within those dimensions while still achieving a high quaility sound? Sensitivity is not really an issue. Does the CSS FR125 fit within these parameters? The FF85K?

I was a little confused between Fonken sizes and which drivers go with which box, I could not find dimensions for µFonken & milliFonken.

I'm really ready to pull the trigger on drivers and start cutting some Baltic Birch. Veneer will be Tineo.

Again, thanks for the help.

Cheers,

Mr_Macgee
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Old 29th January 2008, 07:20 AM   #9
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Quote:
Originally posted by mr_macgee
I'm also limited on dimensions. The width can not be more than 7", the depth no more than 9.5", the height as high as 12".
If one assumes 12mm (1/2") BB then you have a maximum gross internal volume of ~8.8 litres allowing for some bracing.

Quote:
What is the largest driver I can have within those dimensions while still achieving a high quaility sound?
You can fit FE127e or FR125SR. What amplifier are you using (that could seriously sway the choice one way or another)

Quote:
I was a little confused between Fonken sizes and which drivers go with which box, I could not find dimensions for µFonken & milliFonken.
The FE127e goes in all the Fonken boxes except for the µFonken (FF85k). The CSS FR125 goes into a miniOnken

The Fonken & miniOnken are identical except for the port heights and the shape of the internal holey brace. The GR & FS Fonkens are the same "size" as the regular Fonken but twisted into different shapes to suit different needs, (all of these have a net volume of 13 litres)

The mFonken is the smallest box i could squeeze the FE127 in (net 4.5 litres). The µFonken is net 2 litres.

I have added the preliminary plans for the mFonken & µFonken to the Fonken page (please report bugs & omissions. That and a 3D visualization for the mFonken are all that are missing from these plans)

http://www.planet10-hifi.com/fonken.html

As we have moved forward we have personally come to prefer the FR125 in a 4.5-7 litre aperiodic/resistive vent box.

dave
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Old 29th January 2008, 04:05 PM   #10
chrisb is offline chrisb  Canada
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Quote:
Originally posted by planet10


If one assumes 12mm (1/2") BB then you have a maximum gross internal volume of ~8.8 litres allowing for some bracing.



You can fit FE127e or FR125SR. What amplifier are you using (that could seriously sway the choice one way or another)



The FE127e goes in all the Fonken boxes except for the µFonken (FF85k). The CSS FR125 goes into a miniOnken

The Fonken & miniOnken are identical except for the port heights and the shape of the internal holey brace. The GR & FS Fonkens are the same "size" as the regular Fonken but twisted into different shapes to suit different needs, (all of these have a net volume of 13 litres)

The mFonken is the smallest box i could squeeze the FE127 in (net 4.5 litres). The µFonken is net 2 litres.

I have added the preliminary plans for the mFonken & µFonken to the Fonken page (please report bugs & omissions. That and a 3D visualization for the mFonken are all that are missing from these plans)

http://www.planet10-hifi.com/fonken.html

As we have moved forward we have personally come to prefer the FR125 in a 4.5-7 litre aperiodic/resistive vent box.

dave

No two driver models will sound exactly alike, even in enclosures optimized for as close to identical performance as their respective T/S parameters will allow.
A perfect example is the CSSFR125 in mini-onken and the FE127E in the Fonken.

Ultimately the factor of personal preference will enter the calculus, and once you'll got a sense of yours, you need the confidence to override advice of the best intentioned arm-chair quarterbacks. That many of us have arrived at very passionate support of specific driver/enclosure combination should be no surprise, and our choices will not satisfy everyone.

FWIW, and if not already abundantly clear, my current favorites are the FE127E in any of the Fonken designs into which it'll fit, and the FF85K in the microFonken. Note that the latter definitely needs bass support in anything other than intimately near field (i.e. computer monitor) application.

Having said that, if you're willing to pay the not insignificant sensitivity penalty of the XBL motor design, for bang for the buck in the teeniest package, the newest version of FR125 in approx 5 liter resistive vent box would be pretty hard to beat.

My most recent build for those was Dave's design with the angled back and rear facing vent (array of small holes partially stuffed with resistive damping foam). He could advise if a near wall installation would be detrimental to the performance - my intuition is that an overhead boundary might be more of an issue than the rear - but I've certainly been wrong before.

Click the image to open in full size.


If front firing ports are mandated by placement, I'd imagine the mFonken could work as well - although the tuning of port slots would likely need to be adapted. Early in the prototyping of this smaller cabinet, we played with a standard round port, and definitely preferred the sound of the slotted port - it takes only slightly more work, and actually contributes to the side to side cabinet wall bracing.
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