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Old 4th February 2015, 06:15 PM   #1
diyAudio Member
Join Date: Feb 2015
Default Rebuild speaker to powered speakers

Hi everbody.

I'm new in this fantastic forum.

My wife gave me the speakers of my dreams for christmas. They are from 1996 and they were a diy kit from the danish company danish audio technic. Helios HF 275.

Click the image to open in full size.
the bas is a Scan Speak 18W 85/45.
midrange Seas G17REX/P
tweeter Dynaudio D260.

The crossover is very big. 24DB
Click the image to open in full size.

I love the design, but i miss some dynamic and they are very difficult to drive. I have been looking for these speaker for a long time. Therefore I have the opportunity to buy a big amplifier or make them powered.
I have always had the opinion the powered speakers has the most dynamic sound. I have been looking af the plate amplifiers from Hypex. Does AS2.100 have enough juice to the tweeter and midrange? Or should I go for the PSC2.400? I would then buy a amp for the basdriver.

Thank you
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Old 4th February 2015, 11:04 PM   #2
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Join Date: Feb 2002
Location: Western Sydney
Driver data:

That crossover looks far to over-engineered for those drivers...
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 4th February 2015, 11:56 PM   #3
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

Your speaker is a 2.5 way, not a 3 way.

The x/o is incredibly badly designed and overcomplicated
IMO, i'm not kidding, the tweeter stuff is just so wrong.
In all respects the x/o design is utterly awful.
Sadly par for the course for DIY outlets, 3 expensive
drivers, so milk the x/o costs as much as possible.

You need 3 stereo amplifers, 1 one them nice for the
tweeters. The rest I can't guess as sadly the speaker
looks like selling artifice to the not well informed.

There is nothing good about the tweeter arrangement.

rgds, sreten.

My advice would be, if there are similar fans of these
speakers, just move them on as original (DIY), and
just simply get something far better in reality.
Messing around with them will destroy any value.

Last edited by sreten; 5th February 2015 at 12:05 AM.
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Old 5th February 2015, 06:44 AM   #4
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Join Date: Feb 2015
I had an idea that the crossover is to much. That is also the reason why I would make them powered with using a dsp as crossover. I have been looking at the hypex as2
100 but i'm not sure it's strong enough.
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Old 5th February 2015, 07:24 AM   #5
diyAudio Member
Join Date: Dec 2003
Location: Randers, Denmark
LC Audio made this alternative series filter for the Helios.

Click the image to open in full size.

L C Audio Technology / Serie Delefilter

It's very simpel and cheap to try it out, before you buy six amplifies and a DSP.

Remember to read the description in link number two also.
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Old 5th February 2015, 07:30 AM   #6
Tweet is offline Tweet  Australia
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Join Date: Jan 2015

As a suggestion, if you feel your new speakers are missing that 'dynamic' sound, you could always try your hand at making an 'Open Baffle' design using the same drivers and crossover network.
Just keep your original cabinets so you can always go back to what you had before experimenting with Open Baffle if you become convinced it's not for you.

Open Baffle can open up a whole new world in listening to music , with clear dynamics from the bass to mid-bass right through to a very transparent midrange then on to clear and airy treble.

So using a panel the same size as the front baffle of your existing speakers and with the same speaker placement as on the baffle as you have now, you then only need to support it with a frame so it stands upright. The crossover should work as it did, although a few tweaks may be necessary to get it just as you like it. After all, it is DIY Audio.
The downside with a narrow open baffle design is that the bass generally requires bass augmentation by either electronic equalization or through the addition of a powered subwoofer. Having built many loudspeakers in a box I finally came to the conclusion that it is that very thing ( a box) that kills the natural dynamics and clarity of sound that we are so wishing to hear from our gear.

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Old 5th February 2015, 07:30 AM   #7
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Location: Randers, Denmark
Regarding Hypex AS2.100. It's not underpowered but you will mis one channel since it's 2 way and if you have a large room maybe even weel damped and you like to play a little loud, then the amp is not enough.
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Old 5th February 2015, 07:35 AM   #8
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It was my idea to make it a 3 Way. I Can use a external amp to the Scan speak driver. The dsp Can controll the sub out

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Old 5th February 2015, 08:43 AM   #9
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Join Date: Dec 2003
Location: Randers, Denmark
Open Baffle: With such small woofers open baffle is not an option. You will ned at least 15" woofer. I have four 10" woofers pers speaker in open baffle - thats ok but for very low church organ it's still not enough.
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Old 5th February 2015, 10:42 AM   #10
Lojzek is offline Lojzek  Croatia
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I suggest to either sell it like they are to a fan or do a mod like this.
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