The Smaller Advent Loudspeaker

[Zilch]

EconoWave of Smaller Advent using 6" square waveguide and Selenium D220Ti, left.

The build was documented by member Jonmustang as he did it, and I expect he'll be posting that in this forum.

I haven't worked up a crossover for it yet, but may do that on the PE Tech Talk forum; we did hook it up to a stock one, enough to deem it a "worthy" endeavor.

[Spitball sucker has BASS...! :thmbsp: ]

 

[packrat]

That woofer probably has the best fb/Vb of any woofer ever made - I have 5 of them all refoamed and the fb (resonance in the box) for all of them, if I remember correctly, is right around 42Hz. fs is something like 18 to 20Hz! Like the Large Advent woofer the voice coil is wrapped around a copper former so the power handling must be very high. It's also about 84db/w/m so matching it to the 220ti must have taken a bit of padding! I'm interested in seeing what you end up with as I've always felt this was a great woofer in a nice sized (bookshelf sized!) box.

BTW, I don't think the S.A. looses an octave of bass compared to the L.A., I'm pretty sure it matches it with the same fb. Maybe Zilch knows for sure, but the often seen comment that the SA has an octave less bass than the LA seems to be repeated often but with no real proof.

 

[Doug G.]

You are correct, packrat.

Those who state the Smaller Advent sacrifices the lower octave are confusing it with the later Advent/1 which does compromise compared to the New Advent Loudspeaker.

The Smaller Advent Loudspeaker was designed to have the same useable frequency response as the original Advent Loudspeaker at a reduced efficiency. It was also designed as a 4 ohm nominal impedence to partly counteract the reduced efficiency.

The "spitwad" woofer of the Smaller Advent was specifically designed for this speaker and the added mass afforded by the "spitwad" allows the lower extension.

The Advent/1 uses the same drivers as the New Advent Loudspeaker in a smaller cabinet. Hence the sacrifice of the lowest octave.

Doug

 

[Zilch]

BTW, I don't think the S.A. looses an octave of bass compared to the L.A., I'm pretty sure it matches it with the same fb. Maybe Zilch knows for sure, but the often seen comment that the SA has an octave less bass than the LA seems to be repeated often but with no real proof.

Indeed, I compared them and a bunch of other vintage acoustic suspension designs here:

http://www.audiokarma.org/forums/showthread.php?t=247274

 

[Brian]

Per the advertised specification and Advent literature, the lowest octave of the original Advent speaker is sacrificed with The Smaller Advent Loudspeaker. The other change was to go from 8 to 4 ohms to compensate for the 3db less efficiency. With the increase in output from most SS amps, the efficiency loss becomes a near non-issue per the literature.

 

[Doug G.]

All the Advent liturature I have read indicates that the Smaller Advent has the same response range as the original Advent Loudspeaker.

Could you post the relevant specs. to which you refer?

Doug

 

[ahk26]

I am listening to my Smaller Advents right now with a Sansui G-4700 and I am reminded how great these things sound. Clarity and bass are very good. Awesome all around speakers!

 

[Zilch]

In process here, now:

http://techtalk.parts-express.com/showthread.php?p=1647899#post1647899