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Old 5th December 2014, 09:28 PM   #1
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Default Ideas For Efficient & Musical Bass?

I'm hunting for bass design for a 3-way system. The system is for music and is horn based so I'm after 105-110db/w/m efficiency so I'm guessing another horn

I've looked at FLH & BLH folded, straight and corner horn and have become confused. 20hz sub bass is not required but it needs to be able to get up to 150hz and be light on its feet. Size wise, WAF is important but proposed mid bass is 1m long....

Fling some ideas at me!!!
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Old 6th December 2014, 02:41 AM   #2
gvasale is offline gvasale  United States
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Start by looking for raw speakers that have that level of efficiency. There are some, but I don't believe there are too many. Shameless plug for Altec & derivitaves aka Great Plains Audio. Their woofers are in the 98db and higher range...15"

They will easily handle 150Hz withou blinking an eye. 416 types have a little deeper bass than 515 series. They need somwhat large volumes for use as direct radiator systems, and are very popular in horn type systems. You must have some home grown Tannoys there too, i suspect.
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Old 6th December 2014, 06:53 AM   #3
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GPA are prohibitively expensive for a UK build . As I understand it, a driver with a rising response is ideal but they're pretty hard to find in larger 15" drivers.

There are some existing designs that I'm interested in but most are for PA/HT systems or don't have much in the way of objective 3rd party reviews etc for music making. Eg,- La Scala bass with ported extension (no measurements), 7Pi corner horn (no measurements for bass and most reviews on Pi website), PPSL looks interesting (all discussion seems to me technical and having waded through some monster threads I'm non the wiser re efficiency)

So what's recommended as musical & efficient?
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Old 6th December 2014, 07:26 AM   #4
AllenB is offline AllenB  Australia
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If matching efficiencies is getting in the way of progress, then using a separate bass amplifier removes this criterion..at least until you get to where you're going with it and even then allows you to make small adjustments, such as the inevitable dB or two you need here and there without having to change the upper crossovers.
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Old 6th December 2014, 08:35 AM   #5
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Sorry guys, should have added, full minidsp control.

I'd like to get the efficiencies fairly closely matched. Dialling down the mid/high is okay as I understand it, but raising the bass vol = more excursion = greater likelihood of distortion
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Old 6th December 2014, 12:05 PM   #6
Scott L is offline Scott L  United States
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Quote:
Originally Posted by JRKO View Post
Sorry guys, should have added, full minidsp control.

I'd like to get the efficiencies fairly closely matched. Dialling down the mid/high is okay as I understand it, but raising the bass vol = more excursion = greater likelihood of distortion
Actually, it's the larger the box= the greater the efficiency.

The must be, there has to be, some one in the UK who understands the ppsl principle and can find suitable drivers to build you a quality bass system.
30- 150Hz is pretty much a cake walk, and with decent drivers, can fetch you
102 or so, db/watt if built correctly.
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Old 6th December 2014, 12:42 PM   #7
sippy is offline sippy  United Kingdom
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Hey J, good to see you back and on track.
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Old 6th December 2014, 12:53 PM   #8
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102db/w is good enough. I couldn't find that info, thanks Scott

For that sort of dB/w figure are we looking double 12, quad 12 or double 15? What driver attributes are required?
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Old 6th December 2014, 01:13 PM   #9
AuroraB is offline AuroraB  Norway
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Intersting thread - hope it develops....
Bert Doppenbergs BD-15 is around 100.... and available in Europe........
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Old 6th December 2014, 01:30 PM   #10
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Oh and what are the benifits of PPSL vs horn? Effiency, cost, sound quality, ease of build etc?
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