OB-5 questions.

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nodiak

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OB-5 questions.
« on: 9 Jun 2008, 03:37 am »
I've heard the OB-5's have a nice clear sound, with great imaging from the mtm section. Do they keep it together at loud volumes without too much strain? Anyone using lower power tube amps, 20 watts or less?
My room is 300 ft2, have been using 94 db speakers and 3-20 watt tube amps. A single Rythmik sub completes it, works great from quiet to loud.
I've fallen into one of those diy speaker spree's, it's turned me back to my curiosity of using stereo subs and OB-5 mtm section. My next amp will use EL34 or KT88's and is reportedly 7 watts/SE and 14watts/UL. I think that could drive the mtm section, and I'd get another sub.
This could take a little time to get together (sell some things first). But would love to hear of related experiences, would help me narrow down my choices.
I should add that have used enough single drivers to like their "coherency", but not all have good treble. So how do you feel the ribbon mates with the midwoofers tone-wise? Have been told the xo is pretty invisible sonically.
Thanks, Don

ebag4

Re: OB-5 questions.
« Reply #1 on: 9 Jun 2008, 04:06 am »
Hey Don,
I'm running the MTM section of the OB5 with a factory modded Jolida 102B, it sounds great (small room, 10.5'x12.5'x8').  It plays much louder than I could ever listen and I do like to listen loud at times.  200hz and down is handled by a pair of Augies each with their own 100 watt amp.  The MTM has never started to break up at all, just gets louder.  The Neo3PDR is a great tweeter.  Of course my nervosa has me playing with other things again, but that is no reflection on the OB5 MTM section.  Here is the speaker:


Best,
Ed

pbrstreetgang

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Re: OB-5 questions.
« Reply #2 on: 9 Jun 2008, 04:56 am »
Are you selling your OB5s or just moving them over for a while?

ebag4

Re: OB-5 questions.
« Reply #3 on: 9 Jun 2008, 10:51 am »
Are you selling your OB5s or just moving them over for a while?


I'm just playng with some other stuff right now.  Also,I have just ordered a Glow amp one, it will be interesting to hear it with my OB4A but I don't believe it will have quite enough gas, even in my small room. 

Ed

Bill Baker

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Re: OB-5 questions.
« Reply #4 on: 9 Jun 2008, 12:34 pm »
Hi Don.
 I have a pair of OB-7's (with the upgraded woofers in the bass section) and have run various amps from 20 watts to 200 watts. As far as the speaker is concerned, it will play much louder than you ears should be exposed to without break-up but proper amplification is required.
 If you have a problem with break-up, It will come from the amplifier and not the speakers. Pushing the speakers too far with a 7/14 watt amplifier would put stress on the amp which is what causes break-up (clipping).

ebag4

Re: OB-5 questions.
« Reply #5 on: 9 Jun 2008, 03:08 pm »
Hi Bill,
Are you using a separate amp for the woofers or a single amp to drive the entire speaker?

Best,
Ed

Bill Baker

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Re: OB-5 questions.
« Reply #6 on: 9 Jun 2008, 03:22 pm »
Quote
Hi Bill,
Are you using a separate amp for the woofers or a single amp to drive the entire speaker?

 I have set these speakers up in several different configurations including bi-amping and running only the MTM section with a 20 watt tube amp. The amplifier will obviously perform more to it's potential when driving only the MTM section which is a friendly load.

 Right now I am running the speakers with a single 60 watt PP KT88 stereo amplifier (Big Blue - Bella 3205 Reference MKII) and never run out of steam. Every application is different and the only way to find out the answers to your inquiry is to test the waters. Your amp will tell you when it has reached it's limit and running out of steam.

 The MTM will not play quite as loud and effortlessly as your 94dB speakers but your question, "Do they keep it together at loud volumes without too much strain"? has many variables and interpretations. How loud is "loud volumes".


Update....... Sorry Ed: Just realized I was answering your question and not Don's.

nodiak

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Re: OB-5 questions.
« Reply #7 on: 9 Jun 2008, 04:08 pm »
Thanks guys.

Hi Ed, yes aware of your speaks from your thread and as we've discussed by pm's, very good job on those. We have parallel interests in gear. I had Augies and considered the same idea but in my room the Augies are too hard to control (bass lift problems). The Rythmik sub has solved that issue by design and amp controls, plus plays low enough for electronic music and movies. I may go ahead and add another sealed version of Rythmik, and later switch them over to the w-frame Danny's worked out (have done the math, but in my $ituation may be best option). Very good to hear the mtm handles power in your situation. I have a Scott 222c (soon up for sale) that is rated same power as your Jolida, but will switch over to Tubelabs Simple SE.

Hi Bill, Good points of course, I kept the question open ended considering the variety of rooms and gear as well as subjectivity. What you guys have said helps me get a feel for the mtm's power handling, I think they could do fine. There's always that point of how loud you can play the system before it stops sounding good. I agree this is different for all of us, especially dependent on the room and amp. So just a few anectodes from users helps me imagine how they would work out here.
Your comment is what I wanted to hear: "If you have a problem with break-up, It will come from the amplifier and not the speakers."

I've tried 4 single drivers and 2 coax's (using compression drivers) in the 94db range. Some break up in the highs, some sound too ghostly in the mids. They all have good points, and I could live with a couple of them, but that's not what we're doing here y'know  :lol: ! I'm wondering if the ob5 mtm's are better all around speaks. The gear search can get out of hand but ultimately it's like travelling and worth it.
Comments on the ribbon tweeters vs. "x" anyone?

Don   
 

ebag4

Re: OB-5 questions.
« Reply #8 on: 9 Jun 2008, 04:14 pm »
Hi Don,
Sorry about that  :oops:, I had forgotten those were the speakers we had PM's about.  Too many speakers to keep track.

Best,
Ed


nodiak

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Re: OB-5 questions.
« Reply #9 on: 9 Jun 2008, 04:27 pm »
No, no problem Ed, sometimes I'm a bit too dry and to the point, keyboard communication is not my best form. Also, with your speaks and me having had the Augies just confirms rooms/peoples differences. I'm not putting the Augies or you down in any way, they just boom in my room, and it's actually larger than yours. I find these types of things instructive.
I like the deepest bass, sub 20hz. The Rythmik is working in this boomy room so I better stick with it, and will keep checking out the top end solution.
Don (having a tough time communicating today, sick as hell)
« Last Edit: 10 Jun 2008, 04:29 am by nodiak »

Danny Richie

Re: OB-5 questions.
« Reply #10 on: 10 Jun 2008, 10:54 pm »
You know, a pair of the SW-12-16FR's on an open baffle will play up high enough to reach the MTM section of the OB-5 and OB-7.  aa

nodiak

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Re: OB-5 questions.
« Reply #11 on: 11 Jun 2008, 12:10 am »
I know I know  :lol: ! The instant you guys first mentioned those ob subs I imagined that combo. Unfortunately it's a $ thing lately or I would've done that right away. Trying to get there in parts, so it's all fine...as long as my patience holds on.
Also waiting for others to get that  8) OBVIOUSLY FINE  :green: system together and get the pics up so I can live it vicariously!
Don