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Old 26th September 2013, 12:57 PM   #1
inrank is offline inrank  United Kingdom
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Default Bass Driver Options

I had been playing about with my Fostex Open Baffles and came to the same conclusion that I did with some Magnepan MMGs, they sound great but I cant really live with them so far out in the room.

I recently acquired some Klipsch Heresy IIs as something to play with. I have wanted to try for a good while, I really like the mid-treble presentation.

I would ideally like to use them in the corners or up against the rear walls but I cant get the placement right for them to really work, although having them on stands does actually help.

Click the image to open in full size.
Klipsch Heresy II by RSdesignUK, on Flickr

Now, I seemed to have agreed to buy some Radian 850PB drivers with some 400Hz Stereolab Tractrix horn/waveguides. This comes along with some MiniDSP/MiniDigi boards too.

I already have some ~98dB Fountek JP 2.0 Ribbons which I could use as tweeters.


Now, I need a bit of advice, I want something that will go in the corners, and ideally will keep it down to 3-way for now, and a rough starting point:

Bass Driver- ???? ~60Hz - 800Hz
Mid-Range - Radian 850PB / 400Hz Stereolab 800Hz - 8kHz
Treble - Fountek JP 2.0 8kHz - ~20kHz

I was thinking of active on the bass/mid crossover then just passive between the Radian and Fountek drivers.
I will use a Decware Zen for Mid-treble and at the moment, a T-Amp for bass (not ideal) but will get me going.

Now, what to do with the bass? I don't need/want deep bass as mentioned before, its a flat so wont be annoying the neighbors below, and the Heresys actually go low enough (for me) as long as I can sort out the few bass issues from corner/rear wall placement.

Ideally I would like to have them placed in the corners or at least up against the rear walls.
I am thinking something like a 12" bass driver in a simple ported, or most likely sealed cabinet, size is not as important but ideally not a complicated design (bass horn).

High SPLs are not on the cards here, according to my phone (not accurate I know) high volumes for me are hitting 75-80dB peaks @ 1m.

Any suggestions?
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Old 26th September 2013, 02:34 PM   #2
zmyrna is offline zmyrna  United Kingdom
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I would go for a 15" pro driver with 3" voice-coil.
Fs as low as possible.
What is your budget?

Box:
Sealed=No
Bass reflex or Onken=Yes
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Old 26th September 2013, 03:24 PM   #3
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You could just bypass the Heresy xover and use them as bass cabinets.
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Old 26th September 2013, 04:09 PM   #4
inrank is offline inrank  United Kingdom
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Quote:
Originally Posted by dumptruck View Post
You could just bypass the Heresy xover and use them as bass cabinets.
The Heresys will be sold to help fund the new project
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Old 26th September 2013, 04:11 PM   #5
inrank is offline inrank  United Kingdom
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Quote:
Originally Posted by zmyrna View Post
I would go for a 15" pro driver with 3" voice-coil.
Fs as low as possible.
What is your budget?

Box:
Sealed=No
Bass reflex or Onken=Yes
Budget around 200 for the pair of bass drivers.

Any reason to go for a 15" over a 12"?
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Old 26th September 2013, 05:58 PM   #6
zmyrna is offline zmyrna  United Kingdom
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High efficiency 12" drivers have high Fs = won't make bass

Beyma has some mid-efficiency lowish Fs 12" drivers (12BR70).
Beyma SM212 may work better for you though (high-eff, highish Fs).

People usually pair 2" CDs with 15" woofers. There must be a good reason.
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Old 27th September 2013, 11:04 AM   #7
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60-800Hz should be covered easily and within budget by the Beyma 12G40

http://www.lmcaudio.co.uk/assets/pdf/beyma/12G40E.pdf
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Old 27th September 2013, 02:47 PM   #8
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He said 200 for the pair, not each.

How about JBL 2225H? Should be able to find them in your budget, high enough efficiency for tiny amps, and from your description you'd probably be fine with the bass response. In a mid size enclosure you could get a wide range of bass contours by playing with port length (to find what works for your corner placement and taste).
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Old 27th September 2013, 03:15 PM   #9
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They cost almost exactly 100 each around here.

LMC Audio Systems LTD 12" Drivers

Beyma 12G40 12" 500w low frequency driver 8 ohms 104.82
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Old 27th September 2013, 03:37 PM   #10
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Oh, so they do. Couldn't tell you why I looked at US pricing in USD for the Beyma after taking the time to check UK ebay for the JBL.
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