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Old 5th February 2006, 04:04 PM   #1
moo is offline moo  United Kingdom
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Default high efficiency speakers for 2A3

Hi,

I would like to build a pair of high efficiency floor standing speakers. The amplifier is Sun Audio SV2A3. I have used this amp with a pair of old JM Lab speakers (94db sensitivity) with superb results and I have friends using the same amp with less sensitive speakers namely Infinity Primus 360 with no signs of stress at all. So Id say anything with 92db and above sensitivity is ok for me. The speakers should go as low as 30Hz, is this too much to ask? The use of subwoofer is not an option in my set-up.

I listen to mainstream jazz, pop, rock, world, metal. I like nuances, thumping/fast mid bass and extended low bass, especially when I spin Portishead.

My listening room size is 10 (W) x 16 (D) x 7.5 (H), solid side and back walls.

I am open to any suggestion but I tend to prefer/used to the sound of bass reflex speakers. Since I reside in London now, shipping components from outside of EU will cost me more and take longer, but Im willing to take the plunge if its worth while.

Tentatively Im setting my budget at GBP300/USD530/EUR450 (components and shipping), but excluding cost of the cabinet as I have access to table saws, cnc router and other tools, and I already have 2 pieces of 1 thick 3x 8 birch ply, no problem getting more if necessary, and Im addicted to soldering fume.

Thanks in advance for your input.

Regards,
Moo.

P/S is the London Live DIY HiFi Circle still active?
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Old 6th February 2006, 08:58 AM   #2
sreten is offline sreten  United Kingdom
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http://speakerbuilder.net/web_files/...oject/eros.htm

http://speakerbuilder.net/web_files/...ct/erosmk2.htm

Generally you can't have >90dB/w and <30Hz bass in a reasonably
sized floor standing speaker. Though something approaching this
is possible if you carefully utilise room gain and go for an extended
overdamped reflex alignment.

/sreten.

Edit : a design with more recent drivers

http://www.zaphaudio.com/audio-speaker16.html

the floorstanding version.
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Old 6th February 2006, 01:55 PM   #3
el`Ol is offline el`Ol  Germany
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Here are some speakers that have Fs<30Hz and sensitivity 95dB.
http://www.sibatech.co.jp/FAL/SystemCat.pdf
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Old 6th February 2006, 02:00 PM   #4
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by el`Ol
Here are some speakers that have Fs<30Hz and sensitivity 95dB.
http://www.sibatech.co.jp/FAL/SystemCat.pdf
I did say in a reasonable sized speaker. 1.3mx0.6mx0.5m is not reasonable.

/sreten.
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Old 6th February 2006, 03:26 PM   #5
el`Ol is offline el`Ol  Germany
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FS have an AER modification with 99.5dB sensitivity and Fs 29Hz. Vas isn`t really small, but reasonable size is a matter of definition.
http://www.fullrange-speakers.com/5v...md2Btech-e.htm
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Old 7th February 2006, 04:20 AM   #6
el`Ol is offline el`Ol  Germany
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If unreasonable size is an option you could use 38cm woofers from Altec-Lansing, Fertin, and probably some others.
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Old 7th February 2006, 06:34 AM   #7
moo is offline moo  United Kingdom
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unreasonable size is an option and no WAF to worry about. was considering speakers like Altec, TAD, etc. but aren't these hard to come by? besides, they're definately over my budget, right?

would it be wise in my case to spend all my money on the drivers and build OB as:
a)saving on component (no crossover, no extra wood needed)
b)high sensitivity easily achieved

but then again will i get the sound that i like with OB, or even close?

thank you for your input and feel free to keep them coming. i will process the information and report back.

moo.
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Old 7th February 2006, 09:43 AM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by moo

but then again will i get the sound that i like with OB, or even close?
moo.
Hi,

I can't really comment. Most high efficiency designs I've seen are flawed.

http://store.hifiauthority.com/olsherkits.html

the Basszilla seems much more thought out than most.

But ~ double the budget.

/sreten.
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Old 7th February 2006, 10:07 AM   #9
el`Ol is offline el`Ol  Germany
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Hello moo!

Of course this is all far above your budget.

With large frontloaded basshorns like Klipsch-style edge horns or Cerwin-Vega-style folded horns you can get the desired sensitivity and Fs with quite normal drivers (low Qts), but forget BR, sealed, or OB.
Crossover would be around 200 and above it a fullranger or professional coaxial, if you like compression drivers. If you REALLY like compression drivers you could do everything above 250Hz with BMS coaxial compression drivers.

greets, Oliver
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Old 22nd February 2006, 06:07 AM   #10
el`Ol is offline el`Ol  Germany
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The Goodmans Axiom 301 in backloaded corner horns should also do the job. You would just need a supertweeter.

http://cgi.ebay.de/ws/eBayISAPI.dll?...e=STRK:MEWA:IT
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