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Multi-Way Conventional loudspeakers with crossovers

TDL RTL3 Blown Mid Bass unit
TDL RTL3 Blown Mid Bass unit
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Old 18th March 2006, 06:54 PM   #11
peterbrorsson is offline peterbrorsson  Sweden
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Hi again!
Sorry but the Tangbands was probably a mismatch, however an interesting speaker!
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Old 8th April 2009, 03:25 PM   #12
mrmardy is offline mrmardy  United Kingdom
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The bass drivers on the rtl3 come in two types the one with the code 172-ns-XX are about 14 ohms impedance not the more usual 8ohm.These are actualy vifa units and are no longer made or available!they have rounded corners and look like the moral ones everyone keeps going on about but they are not the same..
If you put a multimeter onto the bass driver plugs on the rear both together will be about 5.7ohms (RE dc resistance) if one as blown it will read about 10.3 ohms.(give or take)

The drivers from RTL 2 look the same but they are not... they are 8ohm. you might get away with changing one on each of the pairs to keep the sound balanced but this will cirtainly mess your crossover up.
You could try and get a 2nd hand pair and take out the bits you need. You could also by four of the moral drivers but bare a couple of things in mind. 1/ they are very slightly smaller.(170mm not 172) 2/They are 8 ohms impedance so if you wire them back too standard you will have 4ohm bass midrange and 8 ohm tweeter. 3/ You would need to correct this with a custom crossover.Not as hard as it sounds to make one yourself. You could get hold of four hi fi quality 4ohm drivers (3Xhz -4khz) and wire them in series instead and this would give about the right electrical propertys for the cross over and present a normal impedance to your amp. But I cannot say what it would sound like. I would still want to build a new crossover to get it all back to being balanced.

And while we are on the subject the cross over diagram posted for RTL3 is always wrong... The bass set up has a resistor 10ohms in series with a capacitor. This is a zobel impedance correction circuit not part of the cross over. The cross over for the bass drivers is one inductor in series with the bass drivers. (6db slope)Leave it alone in standard set up you cannot mess with this cap or resistor values!
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Old 9th February 2016, 06:06 PM   #13
Heathcliff is offline Heathcliff  Wales
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Location: Wales
Default TDL RTL3s in need of some TLC!


I'm new to this forum. I read with interest the posts by MrMardy and System7.

I already have 'custom' TDL RTL3 speakers. I bought them 20 years ago and they're my pride and joy.

A few years ago, one of the mid-bass cones blew. Richer Sounds repaired them. They replaced one driver in each speaker with a unit that was similar... but different. Instead of 8 edges, the new drivers have 4. They look similar to the ones used in the TDL RTL3 Special Edition.

Now one of the remaining original (8 sided) drivers has blown. It sounds like someone playing a comb through greaseproof paper. Bzzzzz, Bzzzzzzz, Bzzzzzzzzzz! I'm gutted. I need a replacement driver. I don't think I can afford to buy a matching pair.

I've unscrewed the drivers to have a look. They're unbranded. The 8 sided one is marked 172-NS-06 and the 4 sided one is marked 172-NS-08. They're both polypropylene.

From what I've read, these units are 14 ohm. Or 10 ohm. Nobody actually knows. My scary ex has my multimeter, so I can't find out.

Here's a guided tour. Sorry about the sound quality:


Does anybody have any suggestions of budget drive units I can use to do a quick repair?


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