They look like foam to me - I have the rubber ones, and they are darker and smoother (I've compared with a identical foam surround which was sent to me as a sample). 

I've not had any problems with fitting the rubber surrounds on mine, and the inner edges bend down on the cone just fine once you get some glue on them. I agree with the point about the outer edges (That it wouldn't hurt, if they were a bit bigger), but the surrounds can be used, if you take your time to get the surrounds placed correctly on the cone so they have the same amount of space on each site of the outer edge and out to the basket. 

- Dennis

Same experience Dennis, that's why if Beobuddy find them useless I surely can use them!

Re: Foam/Rubber, I did both types. 

Foam from speaker friends.
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Rubber from Good Hifi.
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They will both work. I don´t think the rubber will get loose by time due to vibrations. As said earlier the foam where easier to work with, but also the foam rings could have been larger in the outer diameter. From a sound quality perspective the foam-ring would in theory sound better, since the less weight, and since that't what the whee originally equipped with. However I must say that it is absolutely impossible to hear any difference. In theory the rubber ring will last longer, but you never know until afterwards.

Regarding receiver: If you run active speakers i doesn't matter so much which receiver you use since the power amplifier is not used. Personally I'd say the BC 9500 is better built than the 2300 and much more good locking than the newer systems. I also offers two way communication.

Okay, more experiences from other users! Bo, what's the other suplliers name, "speaker or audiofriends"?

Sorry, Audiofriends it is. 

Did you do recapping of Penta 3's? If yes could you please give me more details where you bought them?

Just checked the values:

3x 68uF/100V

1x 22uF/100V

2x 8,2uF/100V

1x 27uF/100V

I recapped, two pair of Pentas. The crossovers are slightly different from speakers with serial 04771089.

Part list for speakers prior to 04771089:

Part list for speakers from 04771089 and forward.

I bought caps from link.

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Pos   Qty     Articleno           Article description                     Price           Sum            

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1     6       1341225             MKTA/3.9/160                            1,30 Euro       7,80 Euro      

2     2       1341233             MKTA/5.6/160                            1,70 Euro       3,40 Euro      

3     6       1341240             MKTA/8.2/160                            2,50 Euro       15,00 Euro     

4     4       1341210             MKTA/2.2/160                            0,80 Euro       3,20 Euro      

5     2       1341200             MKTA/1.0/160                            0,50 Euro       1,00 Euro      

6     6       1341106             ERA/22/100/1                            1,10 Euro       6,60 Euro      

7     2       1341108             ERA/33/100/1                            1,30 Euro       2,60 Euro      

8     8       1341110             ERA/68/100/1                            2,00 Euro       16,00 Euro     

9     2       1341220             MKTA/3.3/160                            1,10 Euro       2,20 Euro      

10    2       1341030             ERA/10/100                              0,80 Euro       1,60 Euro      

11    2       1341105             ERA/47/100/1                            1,60 Euro       3,20 Euro       

12    2       1341112             ERA/82/100/1                            2,20 Euro       4,40 Euro      

13    2       1341090             ERA/220/63/1                            2,40 Euro       4,80 Euro      

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Delivery costs................: 15,00 Euro

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Sum excl. Vat.................: 72,87 Euro Vat (19%) ....................: 13,93 Euro Sum incl. Vat.................: 86,80 Euro

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Note the burned coil. Some of the coils on the crossover from No. 04771089 are underdimensioned (too thin wire). They will run too hot when listening to high volume for longer time. The older crossovers are more robust.

Thank you very much Bo! You're a great help🤒