Fixed (Easy!) a Major Design Flaw of the Ohm Walsh Model F


Not sure if it affects all units, but I see it in several images. They obviously didn't care about actual mirror image build back then. They likely didn't think it would matter, but it does. I also do not know whether this has ever been discussed previously in forums, magazines, etc; I'm not willing to search to see, because it doesn't matter that much to me whether it's been discussed previously. If so, great, the Ohm community is on the ball. 

I refer to the nearly haphazard alignment of the metal braces for the driver, which are not aligned in the same places on both speakers. In my work to get this speaker to sound as wondrous as they say it should I noted an irritating beaming of the treble. I have encountered such prior when speakers with tweeters such as ring radiators were on axis. I recognized the vertical metal braces were not symmetrical, and from a lot of experience in the past with performance non-conformity I knew that could be a major contributor to the issue. 

Solution? Let go of the idea of both cabinets being parallel, and make the driver housings/drivers (with the metal braces) symmetrical. Beautiful, a nice tightening of the center image, chasing away of an annoying over emphasis on LF due to a touch more mid-bass filling in unobstructed, and more midrange peeking through. This is an easy fix if you are plagued with this problem, and if you and the furniture authority you live with can handle it.  

I also went with a parallel (double) speaker cable setup by using two sets of cables with banana terminations. I used spade adapters to accommodate a set of spades, and they have hollow backs which allow the second set of banana terminations to be added. This is most definitely do at your own risk, and note that I have bypassed the fuse as well, so I'm a bit more daring with this set than I would with other speakers. I have not that much into them, so if they blow up, they blow up. They were on the way to the dump when I adopted them and had them rehabbed, so I have done a great audiophile work, earning all kinds of points as a Music Lover!  ;) 

I am disproving the old adage - at least in my world - of them needing 300 Watts and blowing up at 301 Watts. I have 600wpc on them and with the double speaker cables (parallel) they are responding beautifully. Still the characteristic muffled mid/bass which will not be eliminated. Please, not interested in arguing that; I hear dozens of speakers in my room and I'm talking about direct comparison to ones I use(d), so if your perspective is different, great. So be it. YMMV etc. 

I'm not pushing them to the limit, but more than I thought I might. I have done perhaps a dozen discrete systems to get them to this state of being very enjoyable. They have responded well enough that I probably won't get rid of them. The one trick I didn't use yet in this setup is to put them on hockey pucks to elevate the soundstage and alter the tonal mix at the ear and decouple from floor. Must remember to try that! 

Current setup:
Small Green Computer sonicTransporter and SONORE Signature Rendu SE
Clarity Cable Supernatural USB
Eastern Electric Minimax Tube DAC Supreme with Staccato discrete opamps
-DAC direct to amp; absolute necessity of using software attenuation in ROON! Do NOT go direct to amp without attenuation!)
Legacy Audio i.V4 Ultra Amplifier (NOTE: channels of this amp are NOT to be joined; I am using bewaring from one channel to achieve the speaker cable doubling for the single terminations of the Model F)
Iconoclast Cables with BAV (Belden Audio/Video) PCs 

I'm gonna have my new friend who has the Tekton Moabs come over to hear.  :)

All equipment with exception of Ohm speakers have been previously reviewed for Dagogo.com 
douglas_schroeder

Showing 1 response by mapman

Nice job bringing a unique pair of old speakers back to life without having to break the bank.