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Cheap Chinese Electronic Crossover


THOMO
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I haven't used them.. They appear to be fixed Xover frequency (2200hz unless you request otherwise) while the specified Xover freq for those speakers is mentioned in one link as 3khz 18db/oct. A measurement mic and a more configurable Xover might be better if you don't have everything measured and calculated already in advance?

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A better option would be to remake the original crossovers.  Guaranteed to sound a lot better than an off-the-rack type, active or passive.  Is the crossover schematic available?

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If you'll excuse my opinion here,  with the system of Bakoon 5521, Supratek, etc I think you should aim a little higher in the quality of the Xover component.

 

I've been rather disappointed with most of the china electronic filters in the past and ended up replacing nearly all the components, not just the transistors, and adding better quality power supplies, etc. 

 

As an alternative, it might be worth chasing around to see if a replacement passive Xover can be built - the original circuit should still be available and this might be a simpler project.

 

 

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Posted (edited)

I have searched high and low for a crossover schematic with no luck.Also been on the lookout for a damaged pair from which I could use or copy the crossover but I have had no luck there.I am resigned to think that a cheap electronic  crossover is never going to be ideal but the alternative is to part them out which would be a shame.

Or buy some Hypex modules which might mean spending as much on them as they are  they would be worth.

Edited by THOMO
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Oh dear, I think you're looking for the wrong thing - this type of circuit has been around forever

 

A good place to start is our own Rod Elliot (see Elliot Sound Products) who has a good explanation about how they work and some of the problems that occur between electronic crossovers and passive crossovers - start with his project No 09 (24 dB/Octave 2/3-Way Linkwitz-Riley Electronic Crossover) that was updated a couple years ago and pcbs are available.

 

Another well known unit is the 6/24 project from diyAudio and, as can be expected from Nelson Pass, it has plenty of information on his website to peruse too.

 

There are also plenty of ready built commercial units over the years and you might find some good 2nd hand ones that aren't digital. 

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The crossover on the super tweeter would just be something like a 0.47uF cap which is almost nothing.They are barely audible .

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Oh yeah, for the Rodgers Studio 1 Xover design, you could try the UK based "Pink Fish Media" site and ask your query there - you might need to join and the usual process but lots of old info there.

 

Or, try dropping a line to Mark Hennessy in the UK (www.markhennessy,co.uk)

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Posted (edited)
12 minutes ago, r3x said:

Quite right.  Here is a complete version.

 

https://www.diyaudio.com/forums/multi-way/335993-rogers-studio-1-a.html

 

The title is wrong in the above thread.  It's for a studio 1, no 'a'.

Thanks for that link r3x.Fantastic!You are a legend!

And thanks to that Croat for bothering to measure the values.

 

They are in fantastic condition so well worth fixing.They even came with the original packing boxes and documentation and via UK and France before ending up here.

Edited by THOMO
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Well worth fixing.  I have a soft spot for BBC bextrene drivers.  I'm listening to some old KEF speakers driven actively from a DCX2496 crossover at the moment.

A friend's dad had some BC1s (very similar to yours) many moons ago.  I thought they were quite special too.

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I have owned Rogers Export Monitors and foolishly sold them.In some ways I preferred them to BC1s.Certainly much better power handling.My first speakers were Tangent RS4s which I bought when I was 18.They were fantastic BBC derived speakers too so I grew up with that sort of sound and still love it.

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The Rogers Studio 1 looks worthwhile to restore Jon, very similar to the Spendor BC-1 in driver compliment with Celestion tweeters including the zippy HF-1300 unit. As you know I have the BC-1 which I rate highly as a very musical/pleasurable sounding loudspeaker. In my experience with these types of vintage speakers, the bass driver in the BC-1 has a special tone (especially with the human voice). The BBC engineers spent a lot of time and effort shaping the profile of the BC-1 bass driver, to get a specific response. To my ears, it sounds more truthful compared to the other bextrene or polypropylene driver alternatives.

 

Agreed, the BC-1 probably won’t play as loud as the others and this is why Spendor developed the later SP-1 model, which will play louder. However, people in the know generally agree that the BC-1 sounds a bit nicer than the SP-1 overall.

 

Maybe we can have a little shoot-out between the spkrs when you have restored the Studio 1 crossovers?

 

Steve

 

.

Edited by Steve M
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Yes look forward to making that comparison. I just have to find somewhere I can have the inductors wound to those values.Might be easiest just to get Madisound to do the whole crossover.

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It’s a easy job to unwind an inductor from a higher standard value.  Nigel at Speakerbug should be able to help.

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I had that exact crossover, and it was fine :) (got it on aliexpress rather than ebay though).

I had a MiniDSP to calculate the xover point, and the specified those details when ordering.
Worked really well while I was building my crossover, and then sold it here when I was done.

 

Cheap, simple, but decent - a good way to see if an electronic xover is for you, without forking out $$$

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Thanks everybody for the input.What a great community here.

I contacted Nigel from Speakerbug and he is building me a crossover.I could have built it myself but Nigel is doing it for a very fair price .Nice to support an Australian business like that.

 

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