If the previous owner has removed the driver mounting gaskets, causing the drivers to sink further into the mounting recess, this would explain why the clamps no longer make contact with the driver flange. A thin layer of silicone sealant may have been used in place of a thicker gasket.
Bevov 5700
Hey guys,
just happen to find he exact same speakers in my grandmas old house (she died this year). Now I am debating with myself what to do with them. I could use some nice speakers for my bar/Lounge room, and could imagine them fitting nicely in there. The problem is they would also need some refurbishments, the plugs obviously dont fit my sound system and I am a total technical amateur with no skills or expertise.
Now what to do with the speakers. Is it worth giving them somewhere for refurbishment? What would be the price limit for that?
If I do not do this, for how much would these sell online? Since someone here in the forum took the effort in refurbishing them so nicely the must have some value among experts.
Thanks a lot for your advice.
Kiddo
Hey guys,
just happen to find he exact same speakers in my grandmas old house (she died this year). Now I am debating with myself what to do with them. I could use some nice speakers for my bar/Lounge room, and could imagine them fitting nicely in there. The problem is they would also need some refurbishments, the plugs obviously dont fit my sound system and I am a total technical amateur with no skills or expertise.
Now what to do with the speakers. Is it worth giving them somewhere for refurbishment? What would be the price limit for that?
If I do not do this, for how much would these sell online? Since someone here in the forum took the effort in refurbishing them so nicely the must have some value among experts.
Thanks a lot for your advice.
Kiddo
Many had no skills and expertise in the beginning. Ask yourself, are you the DIYing kind of a man or not? If so, present your speakers and crossover board with a couple of sharply made shots, and people might start advising how you could refurbish these. First it would make sense to make sure the drivers are electrically and mechanically in normal working order.
Obtaining a suitable adaptor cable would at least reveal if all the individual drivers in the B&O speakers are working, and would therefore indicate the required extent of any refurbishment.
The images of the 5700 appear to show that the original speaker cable simply emerges through a hole in the rear of the enclosure and it is likely to terminate in a two pin male DIN speaker plug. A suitable adaptor to allow you to plug this into the twin 4mm sockets found on modern amplifiers is available to buy ready made, but would be cheaper to construct.
2x 2 pin DIN Speaker Sockets - 4x 4mm Plugs Cable Set
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The Beovox 5700 are really very excellent loudspeakers, much better and easier to repair
than the 5702. If the tweeter/midrange are ok leave them as they are. The ABR was a flaw
and will not be useful. So you can choose to repair the old woofer and fit a Subwoofer
in the the old ABR unit, or replace with two new woofers in pair (distance ring). It is also
possible to fit an adjustable or fixed vent if high output is needed. You will need to use
software such as X-over or LspCAD to fix the numbers for filter and ports. I promise,
you can really obtain some very good results with this old loudspeaker unit.
than the 5702. If the tweeter/midrange are ok leave them as they are. The ABR was a flaw
and will not be useful. So you can choose to repair the old woofer and fit a Subwoofer
in the the old ABR unit, or replace with two new woofers in pair (distance ring). It is also
possible to fit an adjustable or fixed vent if high output is needed. You will need to use
software such as X-over or LspCAD to fix the numbers for filter and ports. I promise,
you can really obtain some very good results with this old loudspeaker unit.
I sold the speakers. But the schematic of the crossover contains the information needed. Be aware that, there are different versions of the beovox 5700, so the crossover can be different. Check the values on the actual capacitators in the crossover. A technician can analyse the crossover and draw the schematic himself. Or google for " crossover Beovox 5700"
Hello everyone,
I have a pair of BeoVox 5700s. Sadly the woofers on both and tweeter on one seem beyond repair. The woofer speaker coils are making contact with the magnet or some metal fillings causing a scratching sound. Not sure what the problem is with the tweeter.
I really link the speaker housing though and the other parts seem fine. I was wondering if anyone could recommend a suitable replacement woofer and/or tweeter? Also, if there is any way to repair the woofers I'd love to know.
Cheers!
I have a pair of BeoVox 5700s. Sadly the woofers on both and tweeter on one seem beyond repair. The woofer speaker coils are making contact with the magnet or some metal fillings causing a scratching sound. Not sure what the problem is with the tweeter.
I really link the speaker housing though and the other parts seem fine. I was wondering if anyone could recommend a suitable replacement woofer and/or tweeter? Also, if there is any way to repair the woofers I'd love to know.
Cheers!
Replacement for Celestion HF2000 tweeter: Seas 19TFF1 H0737-08 Tweeter - Celestion HF2000 replacement
Sounds like the woofer voice coils are burnt out. This would call for a recone job, but it is highly unlikely that parts for these particular woofers would be obtainable.
The B&O 5700 has a 10" woofer, either the Philips AD1056 or, later, the Philips AD10100 which has a ceramic magnet.
The specifications of the latter can be downloaded from here: 10 inch Round High Fidelity Woofer Speaker-P Philips; Eindho
You may use these specifications to search for a suitable 10" replacement woofer.
Sounds like the woofer voice coils are burnt out. This would call for a recone job, but it is highly unlikely that parts for these particular woofers would be obtainable.
The B&O 5700 has a 10" woofer, either the Philips AD1056 or, later, the Philips AD10100 which has a ceramic magnet.
The specifications of the latter can be downloaded from here: 10 inch Round High Fidelity Woofer Speaker-P Philips; Eindho
You may use these specifications to search for a suitable 10" replacement woofer.
Attachments
supplement to my original post:
My original post is not exactly right regarding the two 50 uF capacitors in the lowpass section in the crossover, apologies.
I replaced the 2x50 uF with one 100uF bipolar capacitor per crossover. It should be clearly visible on the photo's, It is the one on top next to the green resistor.
If you look at the crossover filter scheme you see that the 2x 50 uF is not in the signal path of the lowpass filter of the woofer. It is very common in lowpass crossovers to place a bipolar capacitor in that case, due to costs and size. A MKP capacitor that size is very big and expensive.
My original post is not exactly right regarding the two 50 uF capacitors in the lowpass section in the crossover, apologies.
I replaced the 2x50 uF with one 100uF bipolar capacitor per crossover. It should be clearly visible on the photo's, It is the one on top next to the green resistor.
If you look at the crossover filter scheme you see that the 2x 50 uF is not in the signal path of the lowpass filter of the woofer. It is very common in lowpass crossovers to place a bipolar capacitor in that case, due to costs and size. A MKP capacitor that size is very big and expensive.
OP:
OP: can you share the exact product you used from Rubio Monacoat? I have the same speakers I'm refurbishing and like the color you got out of the speakers with the finish.
Bang & Olufsen Beovox 5700, classic vintage loudspeakers restoration, renewal, repair
I acquired these speakers a while back.
The speakers looked terrible, they were scratched and smeared with white muck / paint, dusty and very dirty and sticky. At the top were circles in the wood of lime/water that had leaked from flower pots or something. The foam dust caps in the woofers were completely perished. The pieces of foam fell out when I removed the front.
One of the resistors in the filter of a loudspeaker was completely burned out. Most electrolytic capacitors had wrong values and / or had an ESR of 1 to about 2 Ohm.
What have I done?
- Crossover filters largely renewed / upgraded, all wrong value electrolytics capacitators of 44 years old off and replaced by Jantzen audio MKP capacitors that virtually do not age, and have much better specs (especially much lower ESR).
- The orientation of the coils adjusted to reduce crosstalk. To my surprise, Bang en Olufsen had not paid attention to this at the time of manufacturing.
- The Rosewood veneer completely refurbished, all stains and the scratches and dirt removed, sanded and then oiled again. Sanded with grit 180 and grit 240, sanding only in the longitudinal direction of the wood grain! Treated the surface with hard wax oil from Rubio Monocoat.
- All units airtight fitted with new sealing tape.
- Mounted decent speaker terminals at the back, instead of the loose wires through a hole from the speaker.
They play excellent again, these are really fine speakers!
Any opinions or remarks?
These were the most expensive speakers of Bang & Olufsen at the time.
The specifications:
B & O, Bang and Olufsen, Beovox 5700, HT 5700, type 6253
100 Watt max. Power
impedance: 4 ohms
Frequency range: 35 - 20,000 Hz
max. harmonic distortion: <1%
woofer: 22.5cm Philips AD 1056 / W8
mid tone: Celestion MF 500
tweeter: Celestion HF 2000
passive radiator 25cm
crossover frequencies 600 - 6000 Hz
dimensions: 36 x 66 x 30 cm
weight: 22.5 kg
version in rosewood / rosewood veneer
Philips alnico woofer AD 1056 / W8
The philips AD 1056 / W8 woofer, the foam dust cover remnants for removal
New linen dust cover glued in, temporarily fixed and weighted with a glass
The crossover filter after upgrading with Jantzen Audio cross-cap MKP capacitors. The coils are rotated to minimize mutual crosstalk through the generated electromagnetic fields.
The old components, with the burnt-out / broken resistor of 22 ohms
Above review of the speakers from the American magazine: stereo review, number 3 from 1972
OP: can you share the exact product you used from Rubio Monacoat? I have the same speakers I'm refurbishing and like the color you got out of the speakers with the finish.
2 year old post, but i have 4 woofers that look a lot like those in post#1 if anyone else is looking to restore these,
dave