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PostPosted: 10 Aug 2020, 07:20 
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Joined: 03 Jun 2020, 11:06
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Location: France
Small Tones comes in Small Packages...

A small 3-Way project with salvage loudspeakers : WAF-3W

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The speakers - tweeter is missing for the moment :

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The boxes - sealed enclosure (QTC=0.77), maybe convertible into bass-reflex (?) - to be studied :

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The midrange back cover bricolage :

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Wait and See... ;)

-tbln

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PostPosted: 12 Aug 2020, 16:22 
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Well... Why not using an infinite baffle in the Kyzylkum desert, finally ?

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Cheers !

-tbln.

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PostPosted: 13 Aug 2020, 10:48 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, Looks nice. It has become really amazing how good smaller speakers can sound now. Even the really tiny ones with 60-100mm cones can actually sound nice. The disadvantage is physics. They are inefficient. I have seen values in the 75 dbw range on some. However since class D amps are quite powerful and small it is not so much a problem as before. Your build looks nice. Personally I'll keep my electrostatics and 205 liter subs 8-) even if they hog a goodly chunck of my listening room.

Good listening
Bruce

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PostPosted: 14 Aug 2020, 15:03 
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Location: France
gofar99 wrote:
Hi, Looks nice. It has become really amazing how good smaller speakers can sound now. Even the really tiny ones with 60-100mm cones can actually sound nice. The disadvantage is physics. They are inefficient. I have seen values in the 75 dbw range on some. However since class D amps are quite powerful and small it is not so much a problem as before. Your build looks nice. Personally I'll keep my electrostatics and 205 liter subs 8-) even if they hog a goodly chunck of my listening room.

Good listening
Bruce


Thanls @gofar99 ! :)

Yes that's true : the offer in small good sound sounding speakers is great now... But yes also : the laws of Physics remains the same.

In the past, I built some monsters, but finally dismantled and sold them to a pal who has a large room to reveal their potential :

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Because it's another issue of Physics for me : my listening room is very small... Fortunately, the sound is very good in it, thanks to non-parallel walls and ceiling, furniture and mess !

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So with the exception of my Magnepan SMGb and my Klipsch Heresy I HBR (with modded Xover) that are a little big, the rest of my DIY speakers (and amps) are rather compact :

WAF-2W using Audax Speakers :
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Triangle T17FL2 full-range 7" speaker in Beech wood enclosure :
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Hence the current WAF-3W project here...

Frontface disposition is defined :

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I extended from 0.3L to 0.6L the back cover of the 3" full-range that I use as a midrange, and finally choose PVC for a more reliable glueing with time :

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Oh, and the tweeters by Philips :

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The cablinets will be Tolexed in "Levant Orange" (sides) and "Ivory White" (top, bottom, front, back) :

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These enclosures are sealed - bassreflex convertible by simply plugging the 63mm vent :

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Here is a simulation showing what can be expected :

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Wait and See ! ;)

-tbln.

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PostPosted: 16 Aug 2020, 13:31 
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Today, presenting the loudspeakers on the box - once drilled but unfinished :

Image

-tbln.

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PostPosted: 23 Aug 2020, 16:49 
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I Tolexed the cabinets today : Ivory White and Levant Orange. Some touch-ups are required to finsh the corners.

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Quick look on speakers presentation : Fonky, Unseen or... Both ?.

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Next steps : mounting, stuffing, speaker measurements in enclosure, crossover determination...

Wait and See,

-tbln.

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PostPosted: 29 Aug 2020, 06:03 
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work is on progress (nameplate simulation) ;) :

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Including for Tolex scraps :D :

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-tbln.

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PostPosted: 06 Sep 2020, 14:59 
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Yesterday evening, first test in mono :

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Verdict :
- No noticeable tone flaw, good damping (low alignment factor n=2.45) and bass level, correct tonal balance. 8-)
- The Visaton W170S8 is a ruggered but not premium performance speaker :| : Fs appears to be 44 and 46Hz instead of 36He specs, efficiency is 86dB specs, much lower than the tweeter and midrange (see L-Pads settings pic below).

I plan to replace the W170S8 by a Monacor SPH-170 of same dimensions but better performances : Fs=38Hz and N=90dB, larger magnet... The simulations show a 10Hz gain on F3 for a similar damping (n=2.78). A good compromise for a 41 Euro unit !

Of course, other speakers could be used like ScanSpeak 18W_8545-01-8 or 18WU_4747T00-4, or SATORI_MW19P-8, but this is not at all the same budget ( 160 to 250 Euro unit).

Crossover : note that the MidRange speaker is a 4-ohms unit.

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I tested different vent configurations : all are interesting alternative, depending on speaker placement... :)

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This evening : stereo listening since I built another corssover (more tidy...) :

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I'll make measurements with my audio software to detect unnoticed flaws or paths of improvements.

Wait and See... ;)

-tbln.

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PostPosted: 15 Sep 2020, 15:49 
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Woofer change : Visaton W170S8 ----> Monacor SPH-170/8

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Larger magnet, lower Fs, higher BL, slightly lower QTS (0.44 vs. 0.47), more efficiency (90 vs. 86dB/W/m)...

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More percussive with better damping, smoother and deeper bass response and extension. This is not tremendous, but nonetheless very noticeable.

A good improvement for a 82 Euros investment 8-)

-tbln.

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