Spendor SP1/2e's with 300B's?

Prime Minister

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#1
Ok, before you guys tell me I am nuts, which I likely am anyway, just think about this one a bit. Ernie and I were talking, and one realization we came to is that in my room size, and my usual listening levels, I am totally under driving my amp. I'm running a 150 watt amp at less then 1 watt in my usual listening levels in my very small room. So, as one trade off, what if I went for an amp that would be MUCH deeper into it's power band the way I usually run it? I figure I would still not get the slam and the dynamics when I was running it hard, but I'd likely get a hell of a sweet midrange the vast majority of the time.

Or, if not a 300B, how about some EL84's with a kicking power supply?

Am I completely nuts?
 
#2
Nope. But perhaps try gauging the SPL of your usual listening with a smartphone app?
The other day I was doing this for fun and I didn't even need a full watt for the loudest I listen to at home.
 

Prime Minister

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#3
David;n25124 said:
Nope. But perhaps try gauging the SPL of your usual listening with a smartphone app?
The other day I was doing this for fun and I didn't even need a full watt for the loudest I listen to at home.
I was going to do that last night, but I got too tired. I'm probably not using a ton more power then you are. I'll take a try tonight.
 

Prime Minister

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#5
billfort;n25126 said:
300B? Yes - completely nuts. :)

EL84 push-pull however...might be worth a try, can you borrow one somewhere to try?
I'd have to poke around some.

I can't imagine that I'd b pushing it much more then 90db anyway, 90% of the time. A 300B wouldn't do that?
 

billfort

Administrator
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#6
5-6w at best. I hate to talk specs but they have a place here (IMO); these are what, 88db eff.? What's the impedance curve look like?

We can certainly try mine on them but you'd have to wait till I have a 'working' 300B again.
 

Prime Minister

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#7
Found this one the internet, which means it must be right:

SP1/2
---This date from relatively recent times. The SP1/2 is a 3-way ( 2 top front ports) but design and ALL units are different from the SP1. The only similarity is the dimension. Sound is notably different, indeed not similar at all. The SP1/2 has greater texture, but lacks a bit the open, airy nature of the original. The greatest problem with these refined and textured speakers is the speed. They sound slow with almost all tube amps and indeed much livelier with ss amps,leading one to suspect voicing with ss amp. So though they are efficient and can be used with 300B amp, the original is preferred. But it is highly recommended for ss amp users. These speakers are RARELY seen.
 
#8
I think you should be fine. The only time that I could clearly hear awful distortion when I was driving the Usher Diamond monitors with the 300B was when we were playing Gangnam Style loud on a NYE night.
 
#10
My room is 14 x 16 or something like that. My amp is 150w....first 10 Class A. I use 1 maybe 2 no more than 5 watts, plenty loud....Speakers 87db.....am I under powering my amp? I have slam and deep bass and fantastic mids.
 

marantzfan

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#12
As far as I am concerned, as long as it doesn't cost you much (I.e, borrowing or buying at a resellable price) what have you got to lose? Give it a shot.

IME, 300b dynamics and bass extension are quite good and the midrange doesn't suck! ;)
 

Prime Minister

Site Owner
Staff member
#13
marantzfan;n25181 said:
As far as I am concerned, as long as it doesn't cost you much (I.e, borrowing or buying at a resellable price) what have you got to lose? Give it a shot.

IME, 300b dynamics and bass extension are quite good and the midrange doesn't suck! ;)
Exactly my thought, Anthony. It seems with my listening habits, I using the first watt 90% of the time. Why not make it a good one?
 

Prime Minister

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Staff member
#14
Ok, been doing some reading online, and it turns out that I am nothing like the first guy to run these guys with 300B's. Apparently, it works just fine.
 

Prime Minister

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Staff member
#16
slippers-on;n25145 said:
My room is 14 x 16 or something like that. My amp is 150w....first 10 Class A. I use 1 maybe 2 no more than 5 watts, plenty loud....Speakers 87db.....am I under powering my amp? I have slam and deep bass and fantastic mids.
It is an excellent question. One that requires some more research.
 
#17
After my recent experiences with the Rogers LS3/5a driven by the CazTech SE845 amps and the JBL 4430 driven by the Almarro, I'd try driving your Spendors with a SET 300B amp in a heartbeat. :)

If The 300B doesn't cut it, I'll bet you that an 845 based amp would do the trick. ;)
 
#18
But for the heat issue, I may consider consolidating my downstreams into something of a passive XO with an SET based on 845 etc.

But it gets way too hot. 300B was too much already in summer.
 

Sarchi

Registered User
#19
I do like the idea of the chief SETtling down and being all SET etc. :)

Who knows, it might even work. 300B is one of the most seductive sounds out there....
 
#20
Prime Minister;n25189 said:
It is an excellent question. One that requires some more research.
Naw...I im not under driving at all....and I don't think you are either, unless you amp is losing energy from the wall unit. If your amp is throwing off to much heat than normal, its very possible you're losing to much energy. But your amp is designed to take a week signal and make it strong enough for your speakers.....from 1 watt all the way up to 150 its not being under driven unless its defective....now its possible to under drive/power your speakers, then you got problems. I think you have a synergy problem.
 
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