Thanks, Toaster!
I recently discovered an 8 inch polycone woofer from PE made by GRS that has Qts of 1.15 with 3mm xmax for $10 ea in qnty of 4 or more. I think running 8 of those per side in a slot loaded woofer will give 97dB at 4 ohms with 2.87v input. That opens up capability of pairing with open back pleated mid/tweeter or higher efficiency fullrange like a 91 dB Faital Pro 4FE35.
Hmm....
GRS 4FR-8 4.5 inch full range driver for $8.20?
Has anyone tried one of these budget full range drivers from PE? I just ran across this for the first time. It has 91dB efficiency and Qts of 0.82 - perfect for OB top driver above 200 Hz. The xmax is obly 1 mm but that isn't a problem if used as the 200 Hz and above top in either an OB, or maybe even a Nautaloss monitor.
GRS 4FR-8 Full-Range 4-1/2" Speaker Pioneer Type A11EC80-02F | 292-434
Has anyone tried one of these budget full range drivers from PE? I just ran across this for the first time. It has 91dB efficiency and Qts of 0.82 - perfect for OB top driver above 200 Hz. The xmax is obly 1 mm but that isn't a problem if used as the 200 Hz and above top in either an OB, or maybe even a Nautaloss monitor.
GRS 4FR-8 Full-Range 4-1/2" Speaker Pioneer Type A11EC80-02F | 292-434
An externally hosted image should be here but it was not working when we last tested it.
What do you think of this GRS driver on the bottom? GRS 12PR-8 12" Poly Cone Rubber Surround Woofer | 292-422
Although not for open baffle, I will be teaming a CSS FR125SR (top) with an Exodus Anarchy (bottom).
Although not for open baffle, I will be teaming a CSS FR125SR (top) with an Exodus Anarchy (bottom).
Let me re-phrase my question differently:
For open baffle -
What do you think of this GRS driver on the bottom? http://www.parts-express.com/grs-12pr-8-12-poly-cone-rubber-surround-woofer--292-422
With this one the top: Vifa TC9FD-18-08 3-1/2" Full Range Paper Cone Woofer | 264-1062
I have to think that might work rather nicely; your thoughts?
The other combination, the one used in a sealed enclosure top with ported enclosure bottom - will be the CSS FR125SR and Exodus Anarchy.
For open baffle -
What do you think of this GRS driver on the bottom? http://www.parts-express.com/grs-12pr-8-12-poly-cone-rubber-surround-woofer--292-422
With this one the top: Vifa TC9FD-18-08 3-1/2" Full Range Paper Cone Woofer | 264-1062
I have to think that might work rather nicely; your thoughts?
The other combination, the one used in a sealed enclosure top with ported enclosure bottom - will be the CSS FR125SR and Exodus Anarchy.
The GRS 12PR-8 in qnty 1 still does not have enough surface area for a balanced amount of bass with the Vifa. If you want to use a single woofer go with a 15 in GRS - which is what the Manzanita uses. You need 6 x 6.5 in drivers, or 4 x 8 in drivers, or 2 x 12 in drivers, or 1 x 15 in driver.
You should get this driver if you want to keep it simple to pair with the Vifa Tc9fd. GRS 15PF-8 15" Paper Cone Foam Surround Woofer | 292-415
You should get this driver if you want to keep it simple to pair with the Vifa Tc9fd. GRS 15PF-8 15" Paper Cone Foam Surround Woofer | 292-415
So, 2 twelves may be an option, hmmmm
I am planning on the Mazanita (original w/ with the Peerless 12), but was thinking of trying something on the cheap in the mean time. Maybe I'll check the mounting diameter of the Peerless and see if I can find an inexpensive 12" with the the same cut out to drop in for now - since the Peerless in OOS.
Thank you for helping me bench race.
The latest Manzanita design uses the GRS15 I thought.
There are two versions. The original Mazanita uses the Peerless 12" coupled with the Vifa 3.5".
The designer later came out with a lower cost targeted model (referred to as the Ultra - for ultra low cost) that uses the GRS 15 coupled with the Vifa 3.5".
I am told that although the Ultra sounds great, the original design sounds much nicer - and the difference in baffle size between the two is significant (the Ultra using a MUCH larger baffle).
I have two 12 inch per side and a pair of monacor full range 8 inch 200X/4
Seems like it would fit on a sheet of foam core
Thinking of a skeletal rear to hold the drive units made from spare chipboard loft boarding cut with a jig saw...
That looks like a very nice combination actually since the Monacor SP200X/4 is 94 dB efficient and has a large Qts of 0.97 - perfect for OB.
I am not sure which Beta 12 you have - looks like it may be the coaxial? The Eminence Beta 12's (depending on variety CX, A, or LTA) are all about 0.5 Qts which is a moderate Qts that can work with some EQ'ing given that the xmax is 3.5mm. Since they are 8 ohms putting them in parallel will give you 4 ohms to match the 4 ohm Monacor top and boost the efficiency to ~102dB at 2.83V - providing lots of room to EQ down to match the Monacor.
These are all pretty heavy drivers - you will need that chip board to support the weight - or maybe 3 or 4 layes + double layer cardboard backing.
With DSP and bi-amping you should be able to tweak the EQ and XO to work out pretty nicely. It will probably take some EQ boost in the 40 to 50 Hz range to get bass out of it.
Good luck!
Inspiring stuff again...
I've not yet heard an open baffle speaker in action and reading this thread, plus a few of the other resent cheap OB projects, I'm in the mood to try it out for myself... Also, having the miniSharc means I can now play about a little more
Most UK stockists only have the more expensive range of drivers, so I'm going to turn to Conrad UK for a 3" FR and 8" woofer... budget of £60 should cover everything I need... be interesting to hear how they perform in the near/mid field position.
Paul
I've not yet heard an open baffle speaker in action and reading this thread, plus a few of the other resent cheap OB projects, I'm in the mood to try it out for myself... Also, having the miniSharc means I can now play about a little more
Most UK stockists only have the more expensive range of drivers, so I'm going to turn to Conrad UK for a 3" FR and 8" woofer... budget of £60 should cover everything I need... be interesting to hear how they perform in the near/mid field position.
Paul
Inspiring stuff again...
I've not yet heard an open baffle speaker in action and reading this thread, plus a few of the other resent cheap OB projects, I'm in the mood to try it out for myself... Also, having the miniSharc means I can now play about a little more
Did you listen to the sound clips? Now you can hear an OB in action
The miniSHARC (or miniDSP in my case) has really made it so easy to try out 2-way systems and FAST implementations.http://www.diyaudio.com/forums/full-range/249984-cheap-fast-ob-literally-8.html#post3807593
Good luck on your hunt for budget drivers. I think you can get Vifa TC9FD's in Europe easily enough. Great driver - very low distortion with great smooth mids and enough high end sparkle.
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14 Euros from here
http://www.spectrumaudio.de/breit/vifa/vifa9BN1198.html
It is currently sold out in the US from PE so quite a popular unit. Glad I bought 10 when they were on sale for $10 ea.
http://www.spectrumaudio.de/breit/vifa/vifa9BN1198.html
It is currently sold out in the US from PE so quite a popular unit. Glad I bought 10 when they were on sale for $10 ea.
They have to order from the factory, so a 10-14 day wait before shipping.
Nothing extravagant for the woofer. This 12" woofer is £30 or this 10" woofer for £27, will look at trying to find something with a reasonable price/performance ratio for <£30 each.
Just looking at this 8" Visaton, £23 or €25 from Germany
Nothing extravagant for the woofer. This 12" woofer is £30 or this 10" woofer for £27, will look at trying to find something with a reasonable price/performance ratio for <£30 each.
Just looking at this 8" Visaton, £23 or €25 from Germany
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