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Old 5th August 2011, 06:21 AM   #1
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Default which 10 or 12 bass drivers for phl1120 and neopro 5i

gday all
i,m just about to start a new project and need some advice

i will be using a phl 1120 for mid and a neo pro5i for highs which is a fairly common combination i think so no probs there but i want to set them up in a osboune monument style speaker (i have attached a pic) in a wtmw arrangement and am not sure which bass drivers to use

12" or 10" would be nice and no more than $200 each
they will be powered by 2 stereo f4 so need to be fairly efficent

any advise or critique would be much appreciated
cheers sheafer
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Last edited by slr 5000; 5th August 2011 at 06:24 AM.
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Old 15th August 2011, 12:58 AM   #2
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Quote:
Originally Posted by slr 5000 View Post
gday all
i,m just about to start a new project and need some advice

i will be using a phl 1120 for mid and a neo pro5i for highs which is a fairly common combination i think so no probs there but i want to set them up in a osboune monument style speaker (i have attached a pic) in a wtmw arrangement and am not sure which bass drivers to use

12" or 10" would be nice and no more than $200 each
they will be powered by 2 stereo f4 so need to be fairly efficent

any advise or critique would be much appreciated
cheers sheafer
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Would use a BMTMB configuration and add a 2nd. PHL1120 (or better still PHL1370's) and c/o at a lower frequency.

That would allow you to use larger bass drivers to better cover the first decade.

Regards,

WHG
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Old 15th August 2011, 01:29 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

BMTMB is IMO a pointless domestic arrangement over BTMB unless
you have low efficiency mids, and therefore need two of them.

Simply put due to BSC twin bass drivers match to a mid with the
same sensitivity as each bass driver, but to allow for adjustment
its best to have a mid ~ 3dB higher than each bass driver.

At 96dB for the mid your looking at ~ 93dB/W for each bass driver,
and that is reasonable territory for professional 10"/ 12" bass units.

rgds, sreten.
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Old 15th August 2011, 05:10 AM   #4
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Default Non-Issue, Issue

Quote:
Originally Posted by sreten View Post
Hi,

BMTMB is IMO a pointless domestic arrangement over BTMB unless
you have low efficiency mids, and therefore need two of them.

Simply put due to BSC twin bass drivers match to a mid with the
same sensitivity as each bass driver, but to allow for adjustment
its best to have a mid ~ 3dB higher than each bass driver.

At 96dB for the mid your looking at ~ 93dB/W for each bass driver,
and that is reasonable territory for professional 10"/ 12" bass units.

rgds, sreten.
My recommendation is on point, if speech range is to be kept out of the woofers. The efficiencies are already well matched for each alternative so that is not at issue here. A one decade spread is the optimal bandwidth to operate a typical driver. In the case of the LF, this tack will allow more volume displacement where it is needed to reproduce the first two octaves of music.

Regards,
WHG
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Old 15th August 2011, 08:45 PM   #5
doug20 is offline doug20  United States
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I have been using Neopro5i/PHL1120 + The TD12S drivers for years. You could use the TD12M for higher sensitivity (losing extension).

AE Speakers --- Superb Quality, Unforgettable Performance, Definitely. is where I buy all my woofers.

I think they are over $200 though

btw, Im a huge fan of the Neopro5i/PHL1120 MT design, nice choices

If you are looking for an XO for the Neopro5i/PHL1120 then you might want to contact Curt C over on HTGuide.com. He has build custom designs with them.

Last edited by doug20; 15th August 2011 at 08:47 PM.
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Old 16th August 2011, 12:27 AM   #6
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Quote:
Originally Posted by whgeiger View Post
My recommendation is on point, if speech range is to be kept out of the woofers.
The efficiencies are already well matched for each alternative so that is not at issue here.
A one decade spread is the optimal bandwidth to operate a typical driver. In the case
of the LF, this tack will allow more volume displacement where it is needed to reproduce
the first two octaves of music.

Regards,
WHG
Hi,

No. Not at all. IMO ridiculous midband efficiency means huge bass boxes.
It may be on point for a PA system, but not IMHO a domestic system.

You don't seem to be familiar with BSC, "Baffle Step Compensation",
it changes everything regarding domestic driver sensitivity matching.

rgds, sreten.

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Last edited by sreten; 16th August 2011 at 12:40 AM.
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Old 16th August 2011, 05:16 PM   #7
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Default Agenda?

BSC, as you well know, is mitigated by diver placement and signal tailoring in the c/o. At say, a c/o frequency of 200 Hz, the onset of BSC is isolated well into MF driver range only, where it can be easily dealt with. When doing this, output capacities of the MF driver(s) must be increased to meet the demands of a lower c/o frequency were BSC is not at issue. You know this as well, so your agenda here has nothing to do with the issues you continue to raise.

WHG
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Old 16th August 2011, 05:39 PM   #8
doug20 is offline doug20  United States
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One of the reasons I love using something like the MiniDSP is because it removes the entire BSC issue from the design.
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