Hi all,
Lurker turned first-poster. I'd like to make a pair of speakers to be driven by a low wattage tube amp but im lost in this sea of information and would like to ask the forum here for some guidance on a driver selection and a suitable cabinet type/plan.
Here are some requirements/preferences i have
Lurker turned first-poster. I'd like to make a pair of speakers to be driven by a low wattage tube amp but im lost in this sea of information and would like to ask the forum here for some guidance on a driver selection and a suitable cabinet type/plan.
Here are some requirements/preferences i have
- full range driver
- drivable by 2 watt tube amp
- 11ft x 12 ft room, placement will be have to be near a wall
- Only need medium volumes, up to say 80ish dB?
- I listen to lots of music types so preference toward generalist over specialist in terms of genre suitability
- I accept that I wont get low lows and high highs out of this, but would enjoy mid-bass presence.
- preference for clarity and dynamics over, say, deep bass or big sound stage.
- prefer tower over bookshelf cabinet
- cabinet complexity is not a concern, am a capable wood worker with a shop.
- driver cost up to around $500 but less is also great 🙂 other material costs not an issue for me.
- in USA if that affects sourcing or anything else
With a 2W tube amp, I would like the efficiency to be 90dB/w.m or higher.
I recommend the CHP90mica, which is 89dB/w.m. but produces a sound that can be used in any genre.
I think the sound pressure is acceptable.
The box should be TQWT or Pensil.
I played it with a 2W+2W bus-powered D-class amp.
For more information on drivers and boxes.
https://www.diyaudio.com/community/threads/markaudio-chp-90-mica-ddvp-12-5-ml-tqwt.389031/
I recommend the CHP90mica, which is 89dB/w.m. but produces a sound that can be used in any genre.
I think the sound pressure is acceptable.
The box should be TQWT or Pensil.
I played it with a 2W+2W bus-powered D-class amp.
For more information on drivers and boxes.
https://www.diyaudio.com/community/threads/markaudio-chp-90-mica-ddvp-12-5-ml-tqwt.389031/
Attachments
Greets!
Need to know the amp's output impedance (not tap rating unless it's the same).
Need to know the amp's output impedance (not tap rating unless it's the same).
thanks! The amp in question is a decware zen triode se84ufo2. I dont see its output impedance given on the spec sheet. It does have a high/low impedance switch that I saw are nominally to 8 or 4 ohm speakers, but that's all I got sorry :/
Which one? Output impedance?
Small room, low levels, Power is unlikely to be an issue. Flat impedance response is more important likely.
Why?
Sealed, TL, or horn then.
Alpair 10p in Pensil? FHXL? Really decebt bass, glorious midrange, vintage top (tame and perhaps a bit rolled off). Also fairly sensitive, 2 w will give 93 dB peaks before compression. And fairly easily tweaked for even better performance.
I have not heard CHP-90, it gets good reviews. A little smaller, less sensitive, same DNA. Generally it goes CHN/CH(Por R)/Pluvia/Alpair was the increasingly better product lines but that has been thrown into chaos with many or the latest products.
dave
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To answer "Why?" above, I was trying to not ask for the world, but if it's available i'll take it.
+1 for the FHXL. Room is a little on the small side, and they won't rock with 2 watts, but maybe they don't need to.
jeff
Seas FA22RCZ
Around 94dB efficiency, so 2W is enough for normal listening level in your room size.
I have them in my current speakers. My room is 12x16 ft. and placement is against longer wall. Listening levels also up to 80dB.
They work really good with all kind of music. Hard&Heavy, Disco, 90's electronic, Classical, etc.
I would describe the sound as modern, open and clean. Both LF and HF extension are really good. Sub or tweeter are not necessary. Tonal balance is on the bright side but HF are easy to control by slight off-axis listening (10deg toe-out in my case). Iam not using any kind of response correction. Soundstage is a bit smaller compared to my previous 2,5way speakers but really a negligible difference.
In short, they do everything right.
For cabinet, Seas recommends 60 liter sealed box. That gives F3 around 60Hz with 12dB/oct rolloff, so bass response is good all the way to 40Hz.
Around 94dB efficiency, so 2W is enough for normal listening level in your room size.
I have them in my current speakers. My room is 12x16 ft. and placement is against longer wall. Listening levels also up to 80dB.
They work really good with all kind of music. Hard&Heavy, Disco, 90's electronic, Classical, etc.
I would describe the sound as modern, open and clean. Both LF and HF extension are really good. Sub or tweeter are not necessary. Tonal balance is on the bright side but HF are easy to control by slight off-axis listening (10deg toe-out in my case). Iam not using any kind of response correction. Soundstage is a bit smaller compared to my previous 2,5way speakers but really a negligible difference.
In short, they do everything right.
For cabinet, Seas recommends 60 liter sealed box. That gives F3 around 60Hz with 12dB/oct rolloff, so bass response is good all the way to 40Hz.
Surprisingly i haven’t measured my pair, but i doubt they are 94 dB sensitive.
Good but they need phase plugs. http://www.planet10-hifi.com/downloads/B200-phase-plug.pdf The base needs notching to accomodate the 2 “bumps” in the pole piece.
A simple sealed enclosure works well, mine are a bit less than the 60 litres recommended. Sealed is flexible.
Scott has a few more exotic enclosures: https://www.diyaudio.com/community/...-mark-audio-fostex-tb-dayton-seas-etc.323051/
dave
Hmm......(9.7822*10^-10*134*30^3)/0.38 = (0.009*100) = 9%
SPL W/m = 112.2+10*log(0.009) = ~91.74 dB mid band eff, so the 94 dB spec is apparently a bit optimistic.
SPL W/m = 112.2+10*log(0.009) = ~91.74 dB mid band eff, so the 94 dB spec is apparently a bit optimistic.
Hey all,
Thanks for the help! I went with the markaudio 10p in a pensil cabinet and here's the result! Very much enjoying them, currently experimenting with damping.
Thanks for the help! I went with the markaudio 10p in a pensil cabinet and here's the result! Very much enjoying them, currently experimenting with damping.
