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1st build: full range sealed for 4 liters
1st build: full range sealed for 4 liters
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Old 26th May 2017, 05:43 PM   #1
zgtc is offline zgtc  Europe
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1st build: full range sealed for 4 liters
Default 1st build: full range sealed for 4 liters

Hi,

I will build my first pair of speakers. I want something easy, so I would go for a cube sealed box, around 4 liters (so probably max size around 6") and should be 8Ω.

I am seeking guidance on what numbers I should look for in the specs of a full range driver (ie. SPL? F3? etc). Obviously, driver suggestions are welcome, but I'd prefer to understand how to interpret the marketing talking first.

A bit more of background info:
I am also deciding on a design to build the amp (mostly decided for LM3886 Done Right, around 2x45W at 8Ω), and the kind of music I like is Gabriel, Bowie, and symphonic/rock (Pink Floyd, Dream Theater, Marillion, ...). I set the limit on around $150 for a pair of drivers.

Thank you so much
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Old 26th May 2017, 08:05 PM   #2
revelator is offline revelator  United States
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I would say ...Why limit the design to sealed ? Generally Bass reflex sounds much better. Consider for example Markaudio drivers....some of these drivers are voiced and designed to the extent of not having to add baffle step compensation circuit (that is an inductor paralleled with resistor connected in series to one lead of the fullrange) to flatten the midrange which brings out the appropriate bass...at the expense of loosing some efficiency.

I don't have any of the newest MA drivers ( I do own A pair of CHR 1st generation 4 inches) in a recommended bass reflex enclosure and the overall sound is good especially the bass.

Here a link to Alpair 6 in 3.3 liter bass reflex for example

https://www.madisoundspeakerstore.co...lpair6M-BR.pdf

I have evaluated a variety of small drivers and fullrange including CSS, Tang band and Peerless but all in bass reflex. I personally don't like sealed for small drivers ..unless you have plans to add subwoofer later. Lets see what others recommend....

Hasta Luego....
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Old 26th May 2017, 08:42 PM   #3
zgtc is offline zgtc  Europe
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1st build: full range sealed for 4 liters
Hello,

Sealed: mainly because i want something really small and I (unknowingly) thought vented required much more volume. Well, at the very least you have to account the space for the cone. Also, I like square boxes, but I guess I could get a 4", put it in a 3 liters box and still be able to use vented (will have to design to make sure it all fits)

thank you for the suggestion!
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Old 26th May 2017, 09:44 PM   #4
GDO is offline GDO
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Quote:
Originally Posted by zgtc View Post
A bit more of background info:
I am also deciding on a design to build the amp (mostly decided for LM3886 Done Right, around 2x45W at 8Ω), and the kind of music I like is Gabriel, Bowie, and symphonic/rock (Pink Floyd, Dream Theater, Marillion, ...
Diomío, if you had mentioned Narciso Yepes, Paco de Lucia, Niño Josele con Estrella Morente, or small jazz performances, even barocco or opera, might understand that gear choice...

Now...If i were you i would change my musical program or the project idea...
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"Fitz: I want to use an 8 inch woofer for more bass and a dipolar ribbon tweeter for sweet highs. And the enclosure should be a box with a vent, like everybody uses." S.L. Conversations with Fitz https://www.youtube.com/watch?v=59C7KZ5i42A
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Old 26th May 2017, 09:50 PM   #5
zgtc is offline zgtc  Europe
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1st build: full range sealed for 4 liters
my current system is an oldish panasonic sc pm01 microshit, i dont think the diy would sound any worse
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Old 26th May 2017, 09:54 PM   #6
GDO is offline GDO
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Quote:
Originally Posted by zgtc View Post
my current system is an oldish panasonic sc pm01 microshit, i dont think the diy would sound any worse
Nor much better. Its more or less the boombox i have in the kitchen when i want to enjoy non critícal pop rock programs...

This kind of music dont sound especially engaging on small systems, even if refined sounding. Minimum bruteforce sizematters required...
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"Fitz: I want to use an 8 inch woofer for more bass and a dipolar ribbon tweeter for sweet highs. And the enclosure should be a box with a vent, like everybody uses." S.L. Conversations with Fitz https://www.youtube.com/watch?v=59C7KZ5i42A

Last edited by GDO; 26th May 2017 at 09:57 PM.
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Old 26th May 2017, 11:06 PM   #7
suprf1y is offline suprf1y  Canada
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I built these and I'm very happy with them

"Dragon Foals" writeup - Techtalk Speaker Building, Audio, Video Discussion Forum
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Old 27th May 2017, 03:31 AM   #8
planet10 is online now planet10  Canada
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1st build: full range sealed for 4 liters
One of the reasons to go vented is because most of the small speakers are designed to be used vented (if you want any bass response). The Aura NS3 is the only counter example i can think of.

My 1st choice would be one of the Alpair 6.2s. My miniOnken alignment tends to generTE smallish boxes relatively). Both A6 fit into a 2.5 litre net volume miniOnken (with vent less than 4 litre), the metal is optimum in 3.6 litre net, the paper in 5 litre.

dave
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Old 27th May 2017, 02:52 PM   #9
zgtc is offline zgtc  Europe
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1st build: full range sealed for 4 liters
Quote:
Originally Posted by GDO View Post
This kind of music dont sound especially engaging on small systems, even if refined sounding. Minimum bruteforce sizematters required...
I have a space restriction, thus the 4L limit, so I will have to at least get the most efficient drivers I can for the money I have. I would love to have huge speakers but then I would need a second house for them. I am trying to be realistic.

Quote:
Originally Posted by suprf1y View Post
Noted. I will have a proper look at your detailed post, thank you!

Quote:
Originally Posted by planet10 View Post
One of the reasons to go vented is because most of the small speakers are designed to be used vented (if you want any bass response). The Aura NS3 is the only counter example i can think of.

My 1st choice would be one of the Alpair 6.2s. My miniOnken alignment tends to generTE smallish boxes relatively). Both A6 fit into a 2.5 litre net volume miniOnken (with vent less than 4 litre), the metal is optimum in 3.6 litre net, the paper in 5 litre.

dave
Great, vented in less than 4 liters! I will definitely have a look at those mini Onken plans, thank you.

Also, in general, what are the key parameters I should look for in a FR speaker (vented or sealed) for such volume below 4 liters? I have a list of 3-6" FR but beyond SPL and F3 I am not so sure how to compare them.

Thank you all again
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Old 27th May 2017, 04:31 PM   #10
zman01 is offline zman01  Bangladesh
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1st build: full range sealed for 4 liters
Quote:
Originally Posted by GDO View Post
This kind of music dont sound especially engaging on small systems, even if refined sounding. Minimum bruteforce sizematters required...
Would agree with GDO here. Small single driver systems don't to well with complex rock. A small 2 way perhaps can cope a bit better.

That being said the Dragon Foals might fit the bill, as AFAIK the designer likes rock/metal and in the conclusion he says that the speakers work with rock.

Last edited by zman01; 27th May 2017 at 04:38 PM.
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