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Beovox 5700/5702 opinion ( I started my renovation )

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Martynka
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Martynka posted on Tue, Feb 18 2020 9:47 PM

Hi,

Can you give me some opinion about HT5700/5702 with passive radiator. It's really hard to find something about it. Only short note in Beocentral and here... but when I try to find something about M70 , M75, M100 I can read that 5700 or 5702 was one of the best sounded Beovox.

 

Hmmm... Hmm

 

Marcin

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Dillen
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The crosses are to prevent poking of fingers into the drivers and to prevent the cloth flapping around when you play loud...

Martin

Martynka
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Ok. Thanks for a reply. Do you know about few different crossovers for 5702 ?? I have with resistor second one is without it.

 

EDIT:

Ok, I look one more time on this second crossover and... resistor is under capacitor Smile

BeO is like a good wine - the older the better...

Martynka
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One more question about woofer dust cap :

@Dillen, do you think those are orginal ??

 

 

it looks like textil but in touch is soft like foam, something like neoprene

 

 

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Dillen
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The original dustcaps fell apart many years ago.
Yours are newer replacements.

Martin

Martynka
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I finished wooden and grill works:

I inserted wires terminals on back:

Inside:

I changed all wires from crossover to drivers:

put new pollyfill:

and replaced seal foam on KEF and other drivers:

Now I only wait for Alcap electrolytic capacitors from FalconAcoustics.

 

BeO is like a good wine - the older the better...

priklep
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Very nice, they will bring  you marvelous sound. By the way, l they stunning.Smile

Martynka
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Martynka replied on Tue, Mar 17 2020 10:03 PM

Thanks,

Yes, when I picked up those 5702 and started listen I heard beautiful hi and mid tones, much better than M70, better than my KEF 104aB, but bass was not enough compared it with M70.

 I'm surprised because I only changed wires and sealed drivers/boxes but I have more bass, Now it's sounds more like my M70 but with much better mid and hi tones. Woofer play strong with precision and when 5702 play low tones I still hear amazing hi and mid. In M70 woofer is too domination. 

Now I pluged Beovox 5702 on Speaker1 and M70 on Speaker2 in Beolab 5000 and I have direct compare.... and M70 were beaten on all frequences. 

When I brought 5702 home:

and now:

because the king can be only one.

BeO is like a good wine - the older the better...

Dillen
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Dillen replied on Wed, Mar 18 2020 6:27 AM

The whole 7-series (1700/2700/3700/4700/5700 and all the more or less updated 02-models) are excellent speakers with good quality drivers.
They are from a time, where record players and amplifiers really took off qualitywise, and speakers often became the weakest link.
The difference from the 1960s speakers to these is enourmous.

Martin

Martynka
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And I think these speakers are undervalued. I tried find info in Beoworld and I would never buy 5700/5702 based on information which I found. In my opinion it is excellent speaker with amazing hi and mid tones and great strong woofer sound.

I bought these 5702 because I read the posts of retired audio engineer a man who sold audio equipment in the USA in the 70's. Let me quote a few sentences from "few thread in one" here:

"5702 were better smoother highs, lower distortion bass and a glorious midrange that Cornwalls and Kornerhorns colored."

"The ML-1c and B&O 5700 were our best Book shelf speakers, the Macs had better bass below 60 HZ but from there up the 5700 was the clear winner."

"When Bose and B&W came calling try to sell their wares they all stuttered after hearing their speakers fail miserably when auditioning against the 5700. ADS/Braun, Yamaha NS 1000 and 690 speakers weren't even in the same league. Only a Symphony could compete, but didn't have the sweet highs unitil the 200Z tweeter came along, and by then big speakers were on the way out and were not popular. We kept a few 5700 pairs around as reference speakers just to keep Snell, EPI, and other sales reps honest."

"The 5700 really didn't need 100 watts per channel but that said we sold a bunch with MC 2505 and MC 2105 Mac power amps."

"I know the M150 was supposed to be superior to a 5700, but when connected via a B&O comparator with the levels set the same using a General radio Sound level meter and 1 KHZ octave band pink noise driven with a Mac 2505 power amps our techs and sales staff all thought the 5700 easily won using Sheffield recordings as a reference. Female vocals were more natural and the Drum track record was so much more."


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Martynka
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Someone used it:

Visaton LTS 50 for speaker paper cone.

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Dillen
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Dillen replied on Thu, Mar 19 2020 4:18 PM

Martynka:

"I know the M150 was supposed to be superior to a 5700...

Where the 5700 etc. came at a time, where speakers else were becoming the weakest link, the M150 etc. came at a time, where buyers started looking
more at specs and numbers on papers.
In the specs the M150 is superior. It's far more linear and has far better numbers.
But I don't listen to the numbers or frequency graphs. I listen to what comes out of the speakers and decide if I like it or not.
Perhaps that goes for you too.  Smile

Martin 

 

Martynka
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Dillen:
But I don't listen to the numbers or frequency graphs. I listen to what comes out of the speakers and decide if I like it or not.
Perhaps that goes for you too.  Smile

 

Oh yes, and I not only listen, I also feel. This whole feeling creates a picture of music and decides which speakers you like and which do not.

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Martynka
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@Dillen, do you have experience with LTS-50 ??

I aplied it and... it change everything with woofers. It changed not only sound but woofers work too. I played "Two Feet - Go *** yourself" and bass was harder and stronger than before use LTS-50. Now bass "hit in point" if you know what I mean. It is not lazy, now sounds with precision.


Before aplied Visation, the woofers were shaking. Jumped front and back even though there were no low sounds. Now there is no uncontrolled jump. It seems the woofers are standing still. Even at very low impact they seem to stand still although the bass is stronger. I will try to edit a split screen movie that shows it because I recorded the behavior before LTS.

 

Before:

 

After:

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Dillen
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Dillen replied on Thu, Mar 19 2020 9:38 PM

Visaton, LTS etc. Well, yes and no...
It changes the T/S parameters quite drastically, so in theory the crossovers and perhaps the volume of the cabinets should be changed to suit.
- Theoretically!   They may actually sound better in some peoples ears.

It was tried on some discoteque woofers which cracked and broke up a few months later.
The cones apparently got too rigid and broke like brittle plastic.
Perhaps it would be good on midrange and tweeters. I really only apply it if owners specifically ask for it.

Martin

Martynka
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Martynka replied on Thu, Mar 19 2020 10:17 PM

I will observe it.

I not afraid about T/S parameter (maybe I'm stupid Big Smile ) because originaly AD1056 woofers were made of plain paper like here:

BeO ( I think ) aplied something to paper cone and changed originally T/S parameter. Secound thing, BeO used two different crossovers to the same set of drivers and AD1056 woofer. 

My friend has 6253 type with the same AD1056 and crossovers:

 

My second friend has 6229 type with the same hi and mid driver and Alnico AD1056 but has other crossover, the same like in my 5702:

In the woofer section instead of 100uF (2 x 50uF) I have 75uF
In the mid tone section instead of 3.3uF and 12uF I have 1uF tropical fish, one 2.2uF tropical fish and 20uF
In the hi tone section instead of 2uF (2 x 1uF tropical fish) and 5uF I have 1uF tropical fish, one 2.2uF tropical fish and one 8uF

Third thing, BeO use the same crossovers (both types) with AD10100 (ceramic magnet). AD1056 and AD1056 were different T/S parameter.

BeO is like a good wine - the older the better...

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