Dual 16 ohm woofers for OB

[hasselbaink]

Hi,

My current OB setup is a three way with an ATC 15" woofer taking care of the low end. Not exactly the best match since the Q is quite low.

Two 16 ohm woofers in parallel, Q of 0.4 or higher would be better. I know of the AE Dipole15 but sensetivity is not great and the Q is 0.9 or something like that - too high I fear.

My best bet at the moment is Volt Ps15/250 which can be had at 4/8/16 ohm.
http://www.voltloudspeakers.co.uk/Ab.../about_us.html

Kind of hard to buy this speaker, so I am open for suggestions.

Cheers
Kris

[tinitus]

Search on "T-bass" by Graham Maynard

Lots of information about T-bass in other OB threads

Many positive reports, and enough reading fore a couple of days

[Rudolf]

Originally posted by hasselbaink
I know of the AE Dipole15 but sensetivity is not great and the Q is 0.9 or something like that - too high I fear.

A man has to fight his fears.

So why do you believe a Q of 0.9 is too high? If you start with a driver with a Q of 4, you need to EQ it, until it´s bass response looks like that of a Q=0.9 (at least) driver. Otherwise it will not work for OB.

[ScottG]

Originally posted by hasselbaink
Hi,

My current OB setup is a three way with an ATC 15" woofer taking care of the low end. Not exactly the best match since the Q is quite low.

Two 16 ohm woofers in parallel, Q of 0.4 or higher would be better. I know of the AE Dipole15 but sensetivity is not great and the Q is 0.9 or something like that - too high I fear.

My best bet at the moment is Volt Ps15/250 which can be had at 4/8/16 ohm.
http://www.voltloudspeakers.co.uk/Ab.../about_us.html

Kind of hard to buy this speaker, so I am open for suggestions.

Cheers
Kris

This really depends on what operating pass-band you want it for. IMO 60 Hz is about as low as you need to go to get all the benefits of an OB design.

Eminence Delta, Jensen Neo, Weber.. etc. For non-"guitar" drivers consider adding some resistance to the BD-Design BD-15.

If you want to go lower however, then consider this solution:

http://www.gr-research.com/index.asp...ROD&ProdID=141

and:

http://www.gr-research.com/index.asp...TS&Category=12

Note the statement at the bottom of the woofer page:

"..Two or three of these woofer can give you a flat response to below 20Hz, with great control, good output levels and with no enclosure. There simply is no better open baffle low frequency driver on the market."

[Telstar]

I'm on the same boat, but I'm looking for the tightest possible bass, with smooth integration around 200hz with my narrow OB.

I'm shortlisting some units from Beyma, PHL and others.

Shipping of the GRs from the US kills the budget, becoming a hefty $970+vat+taxes for 4 pieces. They do have the best lower extension, as claimed.

[ScottG]

..a single Pyle Pro 21" might serve as a suitable alternative to 2 15"er's. Or if you are really hurting for cash consider the Goldwood 18" that MJK uses.

[ScottG]

Originally posted by Telstar
I'm on the same boat, but I'm looking for the tightest possible bass, with smooth integration around 200hz with my narrow OB.

Italy? Narrow Baffle?

Sica in Italy makes Jensen. (..not suitable for low freq. extension however.. but the most eff. OB config. you can get.)

[Telstar]

Originally posted by ScottG


Italy? Narrow Baffle?

Sica in Italy makes Jensen. (..not suitable for low freq. extension however.. but the most eff. OB config. you can get.)

They have nothing with a Fs <50hz or something. So, no woofers in the current Jensen lineup. As said, I need 30-200hz.

BTW I didnt know they were italian, although Sica sounded like.

[hasselbaink]

Originally posted by tinitus
Search on "T-bass" by Graham Maynard

Lots of information about T-bass in other OB threads

Many positive reports, and enough reading fore a couple of days

I know of the T-bass. Only usable with solid state amps. I on the other hand only use valve amplification.

Originally posted by Rudolf


A man has to fight his fears.

So why do you believe a Q of 0.9 is too high? If you start with a driver with a Q of 4, you need to EQ it, until it´s bass response looks like that of a Q=0.9 (at least) driver. Otherwise it will not work for OB.

I am using passive x-over and eq at the moment hence the need for a large coil in series with the woofer. This will push Q further upwards. While I haven't really heard a 1+ Q speaker in OB, the under dampened sound is not really my cup of tea.

Originally posted by ScottG


This really depends on what operating pass-band you want it for. IMO 60 Hz is about as low as you need to go to get all the benefits of an OB design.

Eminence Delta, Jensen Neo, Weber.. etc. For non-"guitar" drivers consider adding some resistance to the BD-Design BD-15.

If you want to go lower however, then consider this solution:

http://www.gr-research.com/index.asp...ROD&ProdID=141

and:

http://www.gr-research.com/index.asp...TS&Category=12

Note the statement at the bottom of the woofer page:

"..Two or three of these woofer can give you a flat response to below 20Hz, with great control, good output levels and with no enclosure. There simply is no better open baffle low frequency driver on the market."

As I failed to mention in my initial post that I rely on tube amps which demands high sensitivity speakers. Ultimately I want the twin woofers to cover the 30 to 500 Hz range with good sensitivity. My speakers are 35" wide shallow U-baffles with rounded edges.

best
Kris

[tinitus]

Originally posted by hasselbaink


Ultimately I want the twin woofers to cover the 30 to 500 Hz range with good sensitivity.

Kris

Up to 500hz?

Ultimately use only one woofer

Double woofers that high is a compromise, especially when big

Alternatively, use a SUB