What speakers work well for low watt amps?

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-Richard-

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Re: What speakers work well for low watt amps?
« Reply #120 on: 24 Dec 2018, 07:55 pm »
Hi FullRangeMan ~ It is equally nice to read all of your posts, always interesting insights and highly informative.

Yes, I was into audio beginning when I was 12 years old. My uncle put together a lovely system using Wharfedale co-axial drivers and of course a tube amp, this was many years before Solid Sate circuits were invented. I heard it and was transformed. 16-ohm drivers ruled the day and were a perfect match for low watt amplifiers.

The Lowther PM5 Alnico/Ticonal drivers are 16 ohm, a very important factor in their satisfying performance with my 2 watt Yamamoto flea amp. I had Shigeki Yamamoto replace his standard 8-ohm output transformers with 16-ohm transformers. I ordered the amp directly from him in Japan. Shigeki agreed that the larger transformers would be a much better match for the 16-ohm Lowthers. That is why I suggest that a little research is very helpful when putting together a small watt system. The payoff is the potential for a heightened 'you-are-there' ultra-dimensional musical experience.

Here are 3 interesting posts from the esteemed Nelson Pass that go back to 2009 on the DIY forum. He also uses, or at least used, the Lowther PM5A with his 5 watt amplifier in large open baffle panels:

"I have just finished a detailed subjective comparison between the
PM6A, PM5A, and PM4A, all 16 ohm and all Alnico, in my Big Open
Baffles (BOB).

You may recall that they are very similar except for magnet size,
with the PM4 having the most monstrous magnet (It requires a big
butt brace) and the PM6A having the smallest.

All the drivers have comparable response curves in this system, where
they are crossed to a 15 inch woofer at 150 Hz and 12 dB/oct. All have
a mild notch filter at 4.5 KHz, -3db.

The PM5A edges out the other two for upper midrange naturalness,
but the PM4A had the older whizzer design without the rolled edge,
and I speculate that it would have equaled or perhaps bested the
PM5A.

Nevertheless, the PM5A is the one that sits in the system day-to-day."
---
"Typically I don't need more than 25 watts for the low end, and I usually
use about 5 watts for the top end.

Two drivers, FR and woofer.

Filtering, simple 12 dB/oct and a simple notch - anyone can do it.

Small footprint.... You got me there, but the BLH's that I like tend to
be on the large side.

Anyways, I like the lack of internal box reflections and the way a dipole
"illuminates" the room."
---
"There are a lot of possibilities, but the ones that work out the best
all seem to have high efficiency, light cones and low resonant frequency
down around 20 to 30 Hz. The inexpensive Eminence 15" alpha
and beta are good candidates. Martin King likes the alpha; I have
tried and liked the beta.

I biamp with an active crossover, and I can also EQ the bass response
which helps a lot. Given that, there a large number of woofers that will
do the job, and I have been able to get satisfactory results from SEAS,
PHL, Polydax, Vifa, and Fostex, and OEM parts out of Taiwan."
---

I don't use a notch filter on the Lowthers. Also, not having the resources or space that Nelson has I used what I had on hand to combine with the Lowther and Yamamoto. I stayed with it continuing to research and experiment, and I am happy to say that I am now in love with what this system delivers in musical bliss.

Merry Christmas, Merry Solstice, Happy New Year to all our friends on audio circle ~ Richard


OzarkTom

Re: What speakers work well for low watt amps?
« Reply #121 on: 25 Dec 2018, 05:38 am »
I have found that most speakers with no crossovers work well with low powered amps. At the SPL I listen to, even the low efficiency Zellatons worked well with a 2 watt SET amp..

Folsom

Re: What speakers work well for low watt amps?
« Reply #122 on: 25 Dec 2018, 05:51 am »
They can't be low efficiency and work on 2 watts. They could be low sensitivity, but not efficiency.

Single drivers without crossovers tend to be more efficient because crossovers can eat some power.

FullRangeMan

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Re: What speakers work well for low watt amps?
« Reply #123 on: 25 Dec 2018, 10:33 am »
Thanks Richard, you most kind as always.
I have noted at the DIY Audio forum the experts that wind his own OPTs are windy secondary in 15 ohms instead 16 as a tech reserve.
Merry Christmas to you and all your family :thumb:

OzarkTom

Re: What speakers work well for low watt amps?
« Reply #124 on: 25 Dec 2018, 12:35 pm »
They can't be low efficiency and work on 2 watts. They could be low sensitivity, but not efficiency.

Single drivers without crossovers tend to be more efficient because crossovers can eat some power.

For the Zellatons, they are somewhat low. About 86db. But I listen in the 65-80 db range most of the time. That helps save my hearing and my marriage.

Slam

Re: What speakers work well for low watt amps?
« Reply #125 on: 8 Jan 2019, 03:26 am »
https://nsmt-loudspeakers.com/content/model-50jamaica-speaker

Anyone try these yet? They claim 101 sensitivity

planet10

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Re: What speakers work well for low watt amps?
« Reply #126 on: 16 Jan 2019, 01:35 am »
The words that accompany that speaker, Jamaica, leaves a lot of questions.

For instance, where do you find an 8” driver of that hi-efficiency (101> 98 dB efficiency for the pair or 93 dB each), that at the same time gets below 40 Hz and fits into such a small TL. And where do you find a dome tweeter efficient enuff. Phase coherence up to the XO is certainly possible (althou such a large centre-to-centre is going to cause combing issues in the top part of its band), but above that a tweeter on a 2nd order XO is likely 180° out of phase with the woofers..

dave

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Re: What speakers work well for low watt amps?
« Reply #127 on: 16 Jan 2019, 11:18 am »
If 98 - 101dB they must be 16 ohms to parallel for nominal 8 ohms.

planet10

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Re: What speakers work well for low watt amps?
« Reply #128 on: 16 Jan 2019, 04:31 pm »
8Ω would make the task of finding drivers, fitting them in such a small “TL”, and getting any bass of them is a set of contradictory requirements. I am sceptical, but until they have actually been heard — who knows.

This is the same approach as the ZUs… bigAss midWoofers that naturally roll off with a (horn) tweeter to help out.

dave


Slam

Re: What speakers work well for low watt amps?
« Reply #129 on: 16 Jan 2019, 08:34 pm »
Yeah it seems too good to be true, but I’m no speaker designer...

Just wondering if anyone had any first hand experience with them.

FullRangeMan

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Re: What speakers work well for low watt amps?
« Reply #130 on: 16 Jan 2019, 08:35 pm »
The Zu remind me the wonderful coaxial PHY-HP 12'' Alcicos...

planet10

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Re: What speakers work well for low watt amps?
« Reply #131 on: 16 Jan 2019, 08:42 pm »
Quote
the wonderful coaxial PHY-HP 12''

In my experience, not all that great.

dave

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Re: What speakers work well for low watt amps?
« Reply #132 on: 16 Jan 2019, 09:24 pm »
It dont have the vintage Alnico kind of sound?

planet10

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Re: What speakers work well for low watt amps?
« Reply #133 on: 16 Jan 2019, 11:20 pm »
Not that i am familiar with… and with so many other parts in a speaker contributing to the sonics, it would be hard to say what “alnico sound” is.

dave

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Re: What speakers work well for low watt amps?
« Reply #134 on: 17 Jan 2019, 02:54 pm »
It is great, much better than Ferrite and better than Neo, they have wonderful over tones.