I bought a pair of beyma TPL 150 with 4 horns (JMLC expansion) configured in dipole from a friend.
Replacing my raal 70-20xr for something more efficient has been almost impossible so far but gave a shot to those. I’ve not heard the beyma tpl 150 in original configuration before but the JMLC charge had me pull the trigger and purchase them.
The reason I want to replace the raal is not because of sound quality since so fat from 4-5khz up nothing come close to this. The 70-10 are more interesting over 10khz but the 70-20xr make a wonderful job at 4-5khz and up. My main horn are ok up to 5khz after that it’s pushing it since they start to beam quite a bit. The reason is mostly because I want to build a tube amplifier dedicated for the tweeters and the efficiency of the raal would had needed more power then I wanted to build. I use a 2 watts amp for my mid, I don’t want to build a 50 watts amplifier for the tweeters.
So the raal 210-10 was a huge disappointment, the yamaha 4281 an even bigger one. I can’t stand jbl 2404 2405 and most ribbons. Not an easy task to find a good tweeter that can push 100+ db/w and doesn’t sound harsh or aggressive or dead.
I didn’t expect the horn loaded beyma to be this big so I had to improvise some form of legs until I fix my drivers and rebuild my cabinets. Fortunately I don’t have to make up excuses about horns not to use them in my living room, It’s not about the look for me and frankly I like odd looking speakers in today boring waf approved slim tower market.
I’ve tried some 300 db/oct integration from 1000hz to 5000hz with the deqx and I’m extremely impressed at what those can do. Even at 1000hz they still get lot’s of energy, no harshness and give solid results. The horn seems to do an amazing job a loading them.
When I get time I will post a serie of measurements at 1m and different angles. Nothing scientific. Using my ears I would say at around 8-10khz they start to get slightly directional but nothing really problematic.
For now I’ve settled for 370hz to 3000hz for my mid, 3000hz and up for the jmlc beyma and I’m going to listen to that for some time.
The difference with the raal from 1000-10000hz is big, more energy, realism no harsness and open sounding. Over 10khz I think the raal had a little bit more sparkles but I don’t hear as high in frequency as I use to and this won’t bother me at all. I don’t see any downside going with the beyma except for size. Cymbals sound fantastic and life like, trumpet and female vocals too. Both horns mix really well.
I’m not sure I will keep them dipolar, I will have to compare with and without. I’ve never kept anything dipolar in my room for a long time. I don’t like mixing ways where some are dipolare and some aren’t, it’s messy and even optimized for the listening position they are still trace of reflection distorting the original sound.
I can always keep the back horn and absorb the back wave in it since the original back cover are known to cause some frequency aberration and I don’t want to reinstall those. It’s gonna be my next thing to experiment with those.
I will try to live with this configuration for couple of weeks and if it’s all good will start the process of rebuilding the bass cabinets with double the number of 10″ drivers and passive radiators. Then integrate the tweeters horns in this cabinet and make some form of post for the large JMLC 320hz horn on the side. This should be the final form of my home speakers.
Not the horn but just for fun