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Advent Maestro speakers

Tube Radio

Tube Radio

Super Member
I am getting a pair of Advent Maestro speakers for free.

If they need to be refoamed, what foam should I use?

Also on a Facebook vintage audio group, someone mentioned that Human Speakers makes a replacement woofer that is better than the stock woofer. Anyone know anything about that?
 
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I just used generic foam surrounds.
I used to get them on eBay cheap.

FWIW, the Maestros perform much better with high power amplifiers. They really wake up when I use something above 100wpc. Not that I run them loud, they just work much better with that much power even at low volume.
 
Tube Radio said:
... someone mentioned that Human Speakers makes a replacement woofer that is better than the stock woofer. Anyone know anything about that?
Click to expand...

If it were me I would go straight to the source and contact HS directly

www.humanspeakers.com

HUMAN Speakers: Advent information

HUMAN Speakers builds new speakers and DIY kits in the USA, offers a full range of speaker repairs, and in-depth support for Genesis Physics and EPI/Epicure models.
www.humanspeakers.com
 
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The speakers probably love an amp that can supply a lot of current.

I'm also getting an adcom GFA 535 and 545 for free. Both can supply a lot of current to the speakers even though one is 60WPC and the other is 100WPC.
 
Got the speakers today.

The owner had refoamed them a few years back so no need to worry about that.

I got film caps on order to replace the stock non-polar caps.

One thing I did notice is that there seems to be a hole in the response near the crossover point between the woofer and midrange.

Has that been noticed by anyone and is there a proper fix for it.
 
Definitely.

I'm going to try a 70Hz 24 dB/octave active two way crossover with the speakers tomorrow to see if they sound better with a proper high pass crossover as at the moment I have the speakers running full range and the sub crossover set at 40Hz.
 
So I had found a schematic of these speakers someone drew up who restored a pair and noticed the midrange and tweeter were wired opposite polarity to the woofer.

So I rewired them to be correct and the sound improved some.

However, it still doesn't sound right on some songs.

The only specs I could find list the crossover as 900Hz and 4.5kHz.

Is that correct?

Also does anyone know the impedance of the individual drivers?

I'd like to plug in the numbers to a crossover calculator (if i can find one that allows me to enter both frequencies instead of just one and filling in the other at some octave below or above) and see if the stock crossover is right.
 
Ok, based on calculations I have done using the crudely measured driver impedances, the stock crossover values are way off.

I have no real idea what to do other than take one speaker home then measure the driver impedances and calculate new component values for the crossover or get a prebuilt Dayton Audio three way crossover and use resistors in series with the mid and tweeter to bring the impedance of them up to 8 ohms.
 
I did calculations and here's what I came up with.

Advent Maestro crossover.png

For the midrange I put a 15uF cap in parallel with the stock 14uF cap.

I noticed an immediate improvement in the sound quality. Still not quite there yet as I need to modify the inductors to their new values. Will do that tonight then will install the new 14uF and 4uF film caps. For now I'll put the 15uF electrolytic across the 14uF cap until I get a 30uF film cap.

I'll give them a good listen Monday once I get the crossovers reinstalled.

The only thing missing is male vocals aren't 100% there as they should be due to the woofer inductor being too large in value.

Also after only adding the resistors and the cap, I noticed the sub integrated much better and I no longer had to adjust the level depending on the music that I was listening to.

The jury is still out on the tweeter level though. Will wait until I get the inductors right before deciding on if the tweeter level needs to be reduced. If it does ned to be reduced it won't need much of a reduction and I'll just use a series and parallel resistor to keep the impedance correct
 
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Crossovers are finished and ready to install in the speakers tomorrow.

20240406_163658.jpg

The speakers sounded much better Friday when I tested them with the resistors and cap with the sub no longer needing to be adjusted based on the music being played.

They will sound even better with the inductors the proper value.
 
The Maestro is Jensen's version of the Advent 6003. Jensen reduced the cost and complexity of the XO along with making a more conventional speaker cabinet dimensions.
Click to expand...

Given that, would it be possible to use the crossover from an Advent 6003 in these Maestros and get them sounding right?
 
Concerning these speakers, I've put all work on them on hold as I needed to use them temporarily at church given our one powered column speaker with a built in sub we bought in 2017 won't power on anymore and we aren't in a position to replace it just yet.

While dealing with another stereo, I wanted to go active with the crossover and saw the Xkitz active crossovers.

So I thought about it and determined that maybe this three way active crossover

www.xkitz.com

Linkwitz-Riley 3-Way Active Crossover, Fully Assembled [XOVER-3]

Notice to our customers: Due to ongoing supply line issues, we currently have a back-log of about 1 week. We will process orders in the order they come in. We apologize for the inconvenience. Thank you, Xkitz Bi-Amping or Tri-Amping your speakers is the single most powerful, low cost, and...
www.xkitz.com www.xkitz.com

Would be better than trying to figure out a passive crossover, although it would require three amplifiers.

Do y'all think that would be a better way to go and if so what reasonably priced amplifiers should I use? Amps need to be at least 100WPC at 8 ohms.

Now given these only go to about 40Hz, I would use a sub or two. I can then use this crossover

www.xkitz.com

Linkwitz-Riley 2-Way Active Crossover, Fully Assembled [XOVER-2]

Notice to our customers: Due to ongoing supply line issues, we currently have a back-log of about 1 week. We will process orders in the order they come in. We apologize for the inconvenience. Thank you, Xkitz Bi-Amping your speakers is the single most powerful, low cost, and simplest way for...
www.xkitz.com www.xkitz.com

between the low out of the three way with a crossover frequency of 60Hz.

I would do 900Hz for the woofer to mid and 4.5kHz for the mid and tweeter.

I also learned about baffle step compensation and realized Advent's solution to that was to put foam on the baffle.

That fact is another reason why I really don't want to try and make the passive crossover proper as I could get it right without the foam and it may not sound right with the replacement foam.

The active crossover is nice as I can tweak the levels to where the drivers sound balanced.

However, what I may do is order the resistors needed to pad the midrange and tweeter properly and replace the foam then see how the speaker sounds. If it sounds good enough I may add the zobel networks as shown on the 6003 crossover and see how much the sound improves.

It could be that I won't need the active crossover.
 
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