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Old 30th September 2013, 10:43 PM   #1
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Default Loudspeakers for SE Tube Amp

Hi all,

I am finishing my first DIY Single Ended Tube Amp. It will able to play with KT88, 6L6, EL 34 and other tubes, in triode mode and UL. Maximum output power will be around 8 - 10 W RMS.

I would like opinions on some models of loudspeakers that are available here in Brazil to use with this amp.

As you may know, is very difficult to import loudspeakers here due to their weight and high cost of custom fees. Then, the option is to buy those arriving here via official importing.

Due to an issue of available space in the listening room, I can not buy tower speakers.

The models are:

KLIPSCH RB-81 II
KLIPSCH RB 61 II
KEF iQ 30
PARADIGM Studio 20

Many thanks
Antonio
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Old 30th September 2013, 11:08 PM   #2
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Antonio, first off let me congratulate you on your SE build, (As I am doing one also!)...as you know with the limited power available AND the limited selection in Brazil...of your choices listed the Klipsch RB-81 at 97 Db sensitivity is really the only choice here.
BTW, my build will be even more critical with loudspeaker selection as I will only have 2.5 Watts to work with. I'm going to try to get a pair of Eminence 12LTA shipped here.

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Old 30th September 2013, 11:40 PM   #3
tinitus is offline tinitus  Europe
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97db ? ... I doubt that very much

to be 'a good SE tube amp speaker' may take more than just SPL

I sure hope you have more choices
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Old 1st October 2013, 04:55 AM   #4
seanny is offline seanny  United States
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Read Tubes vs. Transistors White Paper before you choose your speakers.
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Old 2nd October 2013, 12:23 AM   #5
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"It should now be obvious why objective measurements don't seem to give much insight into the performance of amplifiers"
After coming across this sentence, I rolled my eyes & continued reading with a new-found doubt & derision. The remaining text was thereafter thought of as 'opinion interspersed with fact.


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Old 2nd October 2013, 01:03 AM   #6
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Typically you want a speaker with a flatish, smooth impedance curve with low phase angles. Crossovers are the most typical cause of the fluctuations you want to avoid.

dave
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Old 2nd October 2013, 01:10 AM   #7
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Don't all manufacturers use series notch filters for the resonant "spike" of woofer cones...........and Impedance compensation networks for Xl at the top end?? Or does it foul up phasing.


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Old 2nd October 2013, 01:15 AM   #8
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Quote:
Originally Posted by Richard Ellis View Post
Don't all manufacturers use series notch filters for the resonant "spike" of woofer cones
I expect the number that do that is very close to zero. The values required are huge.

dave
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Old 2nd October 2013, 02:02 AM   #9
system7 is offline system7  United Kingdom
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Designing speakers for SET amps is done rather well here:
Arpeggio Loudspeaker

This is with a Fostex unit, the skill is in getting impedance flat and using oversized closed box to compensate for the lack of amplifier damping.

I have had a bash at something similar using 30L closed box and visaton 8" and 2" drivers, which will look a bit like this:

Click the image to open in full size.

No idea if these will go loud enough for you, but bass with SET will go deep. Hope it helps.
Attached Images
File Type: png SET_Speaker.PNG (12.2 KB, 167 views)
File Type: png SET_Speaker_Phase.PNG (21.7 KB, 164 views)
File Type: png SET_Impedance_Correction.PNG (8.3 KB, 163 views)
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Old 2nd October 2013, 02:26 AM   #10
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Mid 80's SPL just isn't going to cut it with typical low powered SET amps, even 211/845 amps might not be enough in a big room.

jeff
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