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In Reply to: RE: GT Audio 2.5 anyone heard them posted by Cameraman on November 09, 2015 at 14:23:47
From the Whats Best Forum:
Quote Originally Posted by TitaniumTroy View Post
Glad to see you here Greg, I tried recently to start a thread about the GT Audio 2.5s over at the Planer Asylum with not much effect. http://www.audioasylum.com/cgi/etv.mpl?forum=mug Though I did read some postive posts over at the Audio Circle about the 2.0 version, that model had 8" woofers I believe. I had a question about the 2.5's midrange which is 8.5" wide, being so wide doesn't that cause some beaming in the higher midrange? I am interested in your speaker as I am hardcore planer fan and own Magnepan 3.6s. How do the 2.5's do against Magnepan 20.7's I know different price point but thought I would ask anyway. Thanks,
Troy
Hi Troy,
The 2.5 uses powered twin 10" woofers in a sealed enclosure, the planar and ribbon are powered by the customers amp.
The model 2 had a powered 8" sub in a vented enclosure, it also had passive twin 8" mid bass units which were part of a 3 way system including a planar and ribbon driver.
The new GTA 2.5 is an easier load for your amp, and the twin powered 10" woofers do a better job integrating with the planar driver than the 8" powered sub and twin 8" mid bass units of the GTA2.
Regarding the 8.5" width of the planar panel, this is the overall dimension, the actual driven area of the planar diaphragm is 7", but your question is still a valid one.
Even though I do not use electrical filters to achieve a desired driver pass band. I do use mechanical means to roll off the upper range, damp resonances and blend the drivers output with the ribbon tweeter.
While the best listening position is in the sweet spot, off axis is still very good.
Nothing as extreme as Sanders electrostatic who designs for on axis listening experience, he will tell you beaming is not a bad thing as it limits room interactions.
As far as Maggie 20.7's I have heard them and find them to be fine speakers, I have enjoyed owning a couple of Maggie models myself.
I believe my GTA 2.5's offers a smaller footprint, better W.A.F. more dynamic bass, higher efficiency , ability to resolve dynamic contrast even at low listening levels, and lower cost are among its attributes.
Regards,
Greg
Follow Ups:
- RE: GT Audio 2.5 anyone heard them - TitaniumTroy 17:33:41 11/29/15 (1)
In Reply to: RE: GT Audio 2.5 anyone heard them posted by TitaniumTroy on November 29, 2015 at 17:31:53
Quote Originally Posted by TitaniumTroy View Post
Greg, I believe where the 10" sealed woofers take over is at 80hz. That is pretty low in frequency in comparison with other hybrid speakers. Which I think is a good thing, keeping as much of the planer sound as you can. Until you reach the range where they start lack impact and can make a smooth transition. Any thoughts on this and any thing else you can elaborate on that you did to make a seamless handoff to the dynamic woofers? What are the woofers made out of any way, aluminum?
Troy,
The 400 watt Hypex subwoofer amp is user adjustable for gain, phase, xover freq. with a max upper range of 120hz, bass Eq of 0- 6db within the range 20-50hz.
The planar driver has usable output down to 60 hz.
The best setting will require experimentation and depend on the room and the system.
I believe the direct connection of the planar driver to the driving amp without any crossover contributes to the seamless hand off to the sub woofers.
The sub woofer cones are made of Nomex.
Greg
- RE: GT Audio 2.5 anyone heard them - TitaniumTroy 17:34:56 11/29/15 (0)
In Reply to: RE: GT Audio 2.5 anyone heard them posted by TitaniumTroy on November 29, 2015 at 17:33:41
Quote Originally Posted by TitaniumTroy View Post
Greg, do you have any pics of the various drivers you could post, while not giving away any trade secrets? What type of amps go well with the 2.5s and how much power? Also what is your set up routine once you get the speakers in a customers home?
I thought I had saved pics, but my computer skills are poor at best. I will have to look around to see where those files may be.
At 90 db and a stable 4 ohm load, they are easy to drive with any moderately powered amp, tube or S/S.
I use 100 wpc S/S monos, http://www.paradoxpulse.com/our-products
They have worked well with amps from 35wpc to 200wpc. If you like to listen to orchestral crescendos at full tilt, I would recommend at least 100wpc.
I always inquire as to weather or not the system inverts phase as many pre amps do.
It surprises me how many people don't consider absolute phase when setting up a system.
Setup requirements are nothing special, I like 7 or 8 feet from center to center of the speakers and at least that much or more to my listening chair.
I like the speakers distance from the wall to be a 3rd or 5th or 7th of the room length.
I want the speakers toed in directly facing me. To adjust for proper toe in, I use a laser pointer mounted to a straight edge to place against the speaker, which allows precise alignment to a center point on the back of my listening chair where my head rests.
Once the speakers are playing music, I have a few go to disks to dial in the subs, to achieve the proper balance.
Greg
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