Big Heil AMT in compact, bi-amped 2-way set up with electronic crossover–help needed! - diyAudio
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Old 7th September 2009, 09:30 PM   #1
SOelker is offline SOelker  Germany
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Default Big Heil AMT in compact, bi-amped 2-way set up with electronic crossover–help needed!

Hi there and good evening!

I am a starter in DIY speaker building (and a first time thread poster here) and look for some advice on my first project! Maybe some of you experienced guys can help me on this – reading through this forum, I can see there are people here 100 times more experienced than me.

My idea is to build a sealed, compact (approx. 15 – 20l / 900 – 1200 cubic inch) 2-way box, bi-amped with electronic xover using the "big" HEIL AMT:
  • Tweeter: HEIL / ESS AMT 1 (4 ohms version) - already bought
  • Midwoofer: no decision taken yet, but the “candidates” are Seas Excel W18E001, ScanSpeak 18W/8531G00, Accuton C173-T6-95 / C180-T6-95, SB Accoustics 17NRXC35-8. Why? Because their TSPs allow for sealed enclosure, they show low resonance frequency and their RMS looks like they can cope with the Air Motion Transformer dynamic-wise
  • Enclosure: compact 2-way (approx. 15 – 20l / 900 – 1200 cubic inch), because right now I do not want to place a floorstander – sealed, because I imagine this fits better to the HEIL AMT
  • Crossover: electronic/active crossover (Behringer DCX 2496), as it provides most flexibility and passive crossover design might be too complicate for me yet. Crossover frequence would be around 1500 – 2000 Hz, I guess.
  • Bi-Amped, because I could eliminate the differing sensitivities of AMT and midwoofer without lowering the AMT
  • Power Amps: not decided yet. I already own a Marantz AVR ZR 6001 with pre-outs
  • Music I listen to: Jazz, Classical Orchestra, Pop, a little bit of Rock sometimes – I usually listen at low to moderate volumes
  • Important to me: a detailed and relaxed sound with a good staging even at lower volume. Live-like levels are not important.

Certainly, I would highly appreciate any feedback or recommendation on my project! I am sure here are people with experience in HEIL AMTs in an electronic crossover set-up. Especially I would like to know:
  • Which midwoofer you would recommend with the HEIL AMT?
  • Which kind of enclosure you would recommend for a compact 2-way?
    I am aware that vented enclosures reach the lower octaves, but I am not sure whether this fits to the AMT.
  • Which kind of power amp would you recommend? Class D or T? Gainclone? Or ordinary Class A or AB?
  • Any other trick that could help

Thanks a lot for your feedback in advance!!

Kindest regards
Stefan
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Old 7th September 2009, 09:34 PM   #2
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One we did... bipolar 9" Fostex midbass drivers. XO at 2 kHz.

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Old 7th September 2009, 10:00 PM   #3
SOelker is offline SOelker  Germany
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Hi Dave!
Thanks a lot for your fast reply and for the great pictures!!
Really great looking and surely great sounding speakers !

I wish I could place floorstanders at my place! Unfortunately, I can not.
I am rather looking for stand-mounted 2-way speaker.
More the Focal Mini Utopia-size, you know?

I am afraid the 9" Fostex will not fit into that concept.

Have you any experience with a "more compact version"?

Kindest regards
Stefan
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Old 7th September 2009, 10:05 PM   #4
cdfr is offline cdfr  United States
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Stefan,

You can find here another example of loudspeaker with AMT. The woofer is a very light paper cone.
http://www.lamaisonduhautparleur.com/kit-albedo.php

As I wrote in a post about AMT 3, I recommend the XO frequency to be above 1000Hz. Say 1500Hz or higher. The Great Heil does not sound so great at 1K.
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Old 7th September 2009, 10:27 PM   #5
SOelker is offline SOelker  Germany
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Quote:
Originally Posted by cdfr View Post
Stefan,

You can find here another example of loudspeaker with AMT. The woofer is a very light paper cone.
http://www.lamaisonduhautparleur.com/kit-albedo.php

As I wrote in a post about AMT 3, I recommend the XO frequency to be above 1000Hz. Say 1500Hz or higher. The Great Heil does not sound so great at 1K.

Hi cdfr,

Thanks a lot for your link!
I am afraid my French is not good enough for this website (despite a Parisian girlfriend some decades ago).

Nevertheless, I understand the ALBEDO Kit to be a floorstander, as much as the SON from Dieter Achenbach or the AMT V or the Hurricane.

Can it be possible that the most compact version of a 2-way with the big HEIL AMT is the original ESS AMT-1 pyramide (even not a stand-mounted 2-way)?

Thanks anyhow!!
It is great to see that people care!!!

Kindest regards
Stefan
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Old 8th September 2009, 01:36 AM   #6
CLS is offline CLS  Taiwan
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How to integrate the inherently dipole Heil and a bipole mid-bass? Wouldn't there be some irregulations around the xover?
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