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Old 23rd February 2010, 09:37 PM   #1
santiu is offline santiu  United States
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Default looking for a small simpled sealed option

Hello all.

I would like to make my first foray into full range speakers. I wanted to keep it simple. Just a sealed enclosure with 3-6" driver, maybe with a rear-firing tweeter. Will be crossed actively to a pair of folded horns, so no worries about low end extension.

So basically I'm out for 3-6" driver (with possible filter) suggestions that would work well sealed you guys think a Fostex 108ez or 107e would work? WAF is important here, so it has to be a nice looking driver :P Any thoughts on a rear firing tweeter, cheap Parts express piezo?

thanks!!
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Old 23rd February 2010, 11:09 PM   #2
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Quote:
Originally Posted by santiu View Post
Any thoughts on a rear firing tweeter, cheap Parts express piezo?
I have only one thought on the tweeter - you're better off without it. Any good quality full range driver won't need one. A cheap tweeter is only going to spoil the sound.
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Old 24th February 2010, 12:29 AM   #3
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I bought a pair of Mark Audio CHR-70s for a portable project I am working on and knocked up this test setup.

Click the image to open in full size.

I cannibalized an old set of Onkyo mini-speakers and cut a baffle out of 3/4" particle board. So far I am quite pleased, though I have not done exhaustive testing. On the high end it does as well as 50 year old ears can manage to detect. On the bottom end it sounds like it starts to roll off around 80Hz or a bit lower but certainly has usable output low enough to cover the bass guitar as long as super loud is not on the agenda at the same time.

See my post here for a more detailed description of my first impressions.

Mark Audio CHR-70 Application Thread
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Old 24th February 2010, 01:01 AM   #4
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What kind of amp do you have? At what point do you intend to cross to the woofers? What kind of budget? What kind of levels do you listen at.

There is a huge range of suitable candidates. Answers to the above will narrow things down considerably.

dave
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Old 24th February 2010, 01:36 AM   #5
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Also, define small. People have different expectations of what small means - are we talking Bose cube (say, 1-2 litres), uFonken (5 litres), mini-monitor (7ish litres) or standmount (say, 10-12ish litres)?
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Old 24th February 2010, 02:14 AM   #6
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uFonken is 2 litres, bose cube probably 1/2 litre

dave
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Old 24th February 2010, 02:43 AM   #7
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Oops, I seem to have misplaced an example volume while proofreading that post - it should have read:

are we talking Bose cube (say, 1/2 - 1 litre), uFonken (2 litres), mFonken (5 litres), mini-monitor (7ish litres) or standmount (say, 10-12ish litres)?
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Old 24th February 2010, 03:28 AM   #8
santiu is offline santiu  United States
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more details:
-small for me is around 8 liters or less. 5 or less would be cooler.
-amp will be low power and part of the build. hoping to use a 41hz Amp3 board (14W/ch)
-listening levels are low to medium. for use in apartment, so not much cranking.
-crossover is 120hz or 180hz. stereo bass though, so i can crossover a bit on the high side if needed
-budget is around $100/driver

just a couple other notes. I'm drawn to a sealed box not for any technical reason. I just like the pure simplicity of it, and hope i can find a suitable driver to do it. Even if it had a rear tweeter (or not as suggested) it would be unseen from the front and have aesthetically negligible impact on cabinet size. Oh, and if the rear tweeter isn't a horrible idea, i forgot i have a pair of Vifa D26TG-35-06 that could use a home if any of you think they might be worth using for that job.

thanks a bunch guys!!!

Last edited by santiu; 24th February 2010 at 03:33 AM.
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Old 24th February 2010, 04:07 AM   #9
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With that XO you have a huge selection of drivers... for instance FE126 in 7 litre will get you to 125 Hz, 92-93 dB. CHR-70 will <80 in 5-6 litre but almost 10 dB less efficient... EL70, FE127, FE103, FE108eS, Alpair 6, Alpair 7, FR125 should all work... and there are TBs, and more.

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Old 24th February 2010, 03:36 PM   #10
santiu is offline santiu  United States
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Great. that's a good list there!

Okay, so I'll be honest. I'm not entirely sure how to narrow down the choices! Sensitivity is important to me due to wanting to use low power digital amps. Off axis performance is also important to me, which is why I was originally thinking of using a 4 inch driver since I'm worried about beaming with say a 6" (and also why i was considering the use of a rear-tweeter although to be honest, i'm still a bit confused on that front).

Do any drivers stick out as being particularly note-worthy as being good sealed box performers with good sensitivity and off axis performance?

thanks again!!!

Last edited by santiu; 24th February 2010 at 03:38 PM.
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