which 10 or 12 bass drivers for phl1120 and neopro 5i

[slr 5000]

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

[whgeiger]

Originally Posted by slr 5000

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

[sreten]

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.

[whgeiger]

Originally Posted by sreten

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

[doug20]

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.

[sreten]

Originally Posted by whgeiger

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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[whgeiger]

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

[doug20]

One of the reasons I love using something like the MiniDSP is because it removes the entire BSC issue from the design.