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Advent speakers with ST-70

198.175.154.212
Posted on July 21, 2009 at 09:16:56
wjcorbinjr
 I have a question for the group. I have a modified ST-70 with Joe's premium driver board and quad cap replacement board. Would the ST-70 be able to handle the 70's era Large Advent speakers? These were 8 ohm, min. 15 watts per channel speakers. Does anybody here run vintage speakers (type/model?) off the ST-70? Thanks!

Bill

I'll be the odd man out., posted on September 13, 2009 at 08:56:22
olddude55
Audiophile

Posts: 25149
Location: Pittsburgh
Joined: July 12, 2003
 I used large Advents with my own Stereo 70 for a year or two and was not happy with the combination, particularly stacked. They were very shouty and somewhat harsh with the ST-70 but much better when I switched to a solid-state integrated amp.
Large Advents are nominally 8 ohms but are actually more like 6 ohms. If you stack them, like I did, the impedance can drop as low as 2 ohms under certain conditions and the Stereo 70 just doesn't seem to be very happy driving that kind of load.
I recently switched to NSM Model 5 mini-monitors and Velodyne subwoofers. The Stereo 70 sounds really sweet with this combo, particularly using the 16-ohm taps.
___
From the Industrial Hub of the Mid-Mon Valley!
RE: Advent speakers with ST-70, posted on July 22, 2009 at 07:09:15
wjcorbinjr
 I want to thank Joe and others for the helpful responses here. I have a chance to get a pair of these speakers and will go ahead with it since these would make a nice addition to my vintage audio collection.

Bill

RE: Advent speakers with ST-70, posted on July 22, 2009 at 07:30:59
GP49
Audiophile

Posts: 111
Location: No Cal
Joined: April 21, 2009
 If you do, take the grills off and look carefully at the drivers. Many Advent woofers have had their foam surrounds deteriorate. By itself this is not a fatal problem if the cone is OK and the voice coil is intact, because the speaker can be easily refoamed; in fact there are special kits specifically for the Advent woofer (and the Dahlquist DQ-10 woofer, which is the same). The problem arises when someone just replaces the woofer with something else that fits the opening. The Advent Loudspeaker used a woofer with the frame of a 12-inch woofer but only the cone of a 10-inch. Replace the woofer with a 12-inch model and the speaker's bass will roll off due to the too-large cone area vs. the cabinet's air volume.

Advent used this design because it allowed for less restriction to free movement of the cone than a conventional 10-inch woofer frame.

Quite often, unknowledgable salespeople more interested in selling cellphone contracts would tell an Advent owner whose foam surrounds had deteriorated, that the larger woofer cone of a regular 12-inch woofer was an upgrade; when the trusting owner installed the new woofer and threw away the original Advent one, the loudspeaker was ruined.

Original Advent woofers had a fiberboard annulus mounted to the frame (they're called "Masonite woofers", and the foam surround of the smaller cone mounted to the fiberboard. Newer replacements from Advent were of the type supplied for the New Advent Loudspeaker, made with a specially designed steel frame to fit the large opening and also the smaller cone/surround. Both work just fine.

Good luck with the Advents. They're a classic.
GP49
RE: Advent speakers with ST-70, posted on July 21, 2009 at 14:21:38
sprucemoose
Audiophile

Posts: 30
Location: Williamsburg, VA
Joined: July 27, 2007
 been running double new large advents on the 4 ohm taps for several years on a stock st70/pas combo. no problems in a 12x19 room with open arches on each end.

RE: Advent speakers with ST-70, posted on July 21, 2009 at 11:33:38
Joe Curcio
Manufacturer

Posts: 1094
Location: Northern CA
Joined: October 10, 2001
Contributor
  Since: July 1, 2002
 Depends on the size of the room your trying to fill BUT - I recently replaced my lab system with a pair of large advents that I restored with new surrounds and better crossover components and with any ST-70 that arrives here for repair/ restoration /mod - these things just rock - no problem at all driving them. Sometimes when I'm listening, the sound is so captivating that I just stop and savor. Frankly, I enjoy the experience as much (sometimes more) than the any of the main systems.

RE: Advent speakers with ST-70, posted on July 21, 2009 at 09:25:01
GP49
Audiophile

Posts: 111
Location: No Cal
Joined: April 21, 2009
 Yes, but more power would be nice. The Advents were somewhat more efficient than the AR-3, on which the Stereo 70's output stage is a bit strained. They're more on a par with the AR-2 series.

Of course all this depends on your listening room. In a small room you'll be fine but such a room also won't support all the low end that Advents are capable of if their woofer foam hasn't rotted out over the decades...or if they have been reconditioned.

Most of us "old guys" who futzed with Stereo 70s when they were still available from Dynaco (the original Dynaco, not the Japanese Panor wannabe) as new amplifiers have probably run this and similar combinations!
GP49

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