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Multi-Way Conventional loudspeakers with crossovers

The Pencil: inspired by Ohm Micro Walsh Tall
The Pencil: inspired by Ohm Micro Walsh Tall
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Old 10th March 2018, 04:01 PM   #101
boswald is offline boswald  United States
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The Pencil: inspired by Ohm Micro Walsh Tall
Juspur used the smaller Nomex HDS drivers. Peerless still makes them in poly, glass, and aluminum. They(the nomex) are still in stock at SpeakerCity, I believe, but the poly and glass are amazingly close on-axis, and all are similar from the back.

Generally speaking, all the HDS drivers will make a good Pencil(I know it's confusing, others have used pencil, pensil,etc as names). You will probably drop the crossover as you go larger.

As even Ohm has gone to smaller drivers on top with below-step woofers below, I would agree with Chris that you can stick to the smaller unless you need the maximum output of the larger ones.

It's a great project, and even if you tire of them, an HDS will never embarrass you in a 'normal' speaker.

Last edited by boswald; 10th March 2018 at 04:04 PM.
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Old 10th March 2018, 04:55 PM   #102
boswald is offline boswald  United States
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The Pencil: inspired by Ohm Micro Walsh Tall
By the way, Madisound has the poly 6.5" for 29$, you cannot beat that, except maybe with the tg9 for 9$ if you want to try a mini.
I have used the nomex 6.5 and the tc9 this way, both worked well, the little one went higher, the bigger much, much louder.
Hmmm...maybe the 6.5 on the bottom, the 3.5 with a baby audax on top....that's 81$ for a pair. Darn sales!!
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Old 10th March 2018, 11:54 PM   #103
R. Jamm is offline R. Jamm  United States
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Thanks for the information about the drivers still being available. are there any drivers that would do a better job? What about the tweeter?

Critofur -- Do you think that The Pencil sounds just as good or better than the 1000 or is it closer to the 2000? What's your overall opinion of the sound quality of the Pencil?
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Old 11th March 2018, 03:23 AM   #104
critofur is offline critofur  United States
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Damnit, I can't find it now, but, a guy from Sterophile went to the NY Audio Show and after listening in the Ohm room he was heaping some high praise on them, talking about how impressed he was that those ~$2,000 speakers sounded better than other rooms with speakers costing upwards of $20K.

I think it had been here, but they must have edited those comments out or something:

Our Final Binaural Video Report from the NYAS | Stereophile.com

If you watch the video and go to 12:20 you can still hear some comments about the Ohm speakers.

My honest opinion, and not because I was connected with Ohm for a while, is that the 1000s are going to be significantly superior to the "Pencils" because they [the 1000s] have substantially more bass output (I know this as I own and have tested both woofers, and, I know about some tricks that the Ohms use to enhance the bass response).

As to the midrange however, the "Pencils" would not nesc. be inferior, depending on the quality of the cabinet construction and the crossover design.
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Old 12th March 2018, 12:19 AM   #105
R. Jamm is offline R. Jamm  United States
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The drivers: Peerless 832873 and Morel MDT-40 (tweeter) are out of production.
Would the Peerless 6.5 driver from Madisonsound for $29 or the wg9 for $9 (or others) be almost as good, just as good or better than what was originally used? Which driver (exact model number)will give the same or better result? What tweeter (or does it matter) will match the mid/bass driver for best results?
I'll just use the simple crossover as suggested, and move the crossover point up or down accordingly.
The cabinet will be the size suggested or changed to accommodate the new driver. What crossover orcabinet changes can make this a better project?
I'm just a novice so any suggestions would be helpful....
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Old 12th March 2018, 03:19 AM   #106
boswald is offline boswald  United States
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The Pencil: inspired by Ohm Micro Walsh Tall
Since the 6.5 is cheaper now than the 5 1/4 or even the 4incher, I guess you'll have to suffer with a bit more bass, sensitivity, and loudness.

Use the 6.5, put it in 14, Mad's port 2"x5.5"(up to 8" in some placements). If you use the same form as Juspur's 5 1/4 or thereabouts put the port in the bottom and stuff almost as high as the port in the box.

Don't get hung up over Peerless part numbers, there are always identical and functionally similar items with varying numbers-oem, different runs,cosmetic differences, etc. And any competent tweeter can do this easy job.
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Old 12th March 2018, 03:20 AM   #107
critofur is offline critofur  United States
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I can tell you that the Peerless 6.5" woofers (I've only tested the Nomex version) are a good choice, as is the Seas ER18RNX (if you can fit them in your budget).

Most woofers are not good for use in this way (like Ohm Walsh or "Pencil" type speakers). In fact, most are very poor for this application. You could test 20 different woofers and find only one is good (a process I have actually done myself, it can get quite expensive and be quite disappointing until you find the one that's good).
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Old 12th March 2018, 04:48 AM   #108
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Quote:
Originally Posted by boswald View Post
Don't get hung up over Peerless part numbers, there are always identical and functionally similar items with varying numbers-oem, different runs,cosmetic differences, etc.
Not always true. Have a look at TC7FD00-04 and TC7FD04-04. Looks like the same thing until you see the frequency response - totally different beast.

The Peerless parts that show up now and again as 'buyouts' often have strange responses or significantly simpler/smaller/cheaper motors. Probably made to order to satisfy the requirements of a product run, then the spares get flogged off and find their way to us via the usual middle men as 'buyouts'.

The Peerless 830874 isn't one of those 'made to order' products afaik, instead part of the here-to-stay HDS line, so should be good.
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Old 12th March 2018, 04:57 AM   #109
critofur is offline critofur  United States
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The Peerless 830874 - at $29 how can you not try it?

However, I'm still hoping that someday somebody will want to work with me here in the Columbus area, because I know of some moderately affordable drivers which are better, and a handful of specially good tricks when it comes to making the speaker better than what you'll normally find being made... I'm just not good at solo projects, I need a team to collaborate with. I had a blast working with Ohm designing the MicroWalsh series and I've had another project on the back burner for years that I'd like to see come to fruition before I get too old to appreciate it.
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Old 12th March 2018, 10:26 PM   #110
R. Jamm is offline R. Jamm  United States
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I was thinking 6.5 driver, but whats a good driver between 4 and 6 inches that can be used?
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