DIY Loudspeaker Projects

[Κώστας Φ.]

Ενδιαφέρον resource site για όσους ασχολούνται με την κατασκευή ηχείων. Περιέχει αρκετά σχέδια, μεταξύ των οποίων και κλώνους ηχείων της ProAc, με αναλυτικές οδηγίες κατασκευής.
Δεν έχω ασχοληθεί με το αντικείμενο αλλά ο άνθρωπος φαίνεται να έχει ρίξει πολύ δουλειά (κορυφαίες μονάδες μεγαφώνων, πολύ ψάξιμο με τα crossover και εξαιρετική εμφάνιση για DIY ηχεία) οπότε είπα να δώσω το link μήπως και κάποιοι σχετικότεροι το βρουν χρήσιμο.

Troels Gravesen's DIY Loudspeaker Site

Τέλος, μερικές φωτογραφίες απο τα project του κ. Gravesen:

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Άλλο ένα πολύ καλό site για κατασκευές DIY ηχείων που περιλαμβάνει και test μεγαφώνων:
John "Zaph" Krutke's Audio Projects and Driver Tests

Για να πάρετε μία ιδέα, κάνω copy-paste τους τίτλους:

Fully documented DIY speaker systems:

• Bargain Mini - Low price, high performance minimonitor - New!
• Bargain Aluminum MTM - Cheap and simple with great sound
• ZD5 - An extremely high end reference level small 2-way with Scan Speak and Vifa drivers
• Waveguide TMM - A floorstanding 2.5-way with minimalist and perfectionist crossovers
• Slimline Wall-Mounted Speaker Part 1 - Cabinet design with formed MDF
• Slimline Wall-Mounted Speaker Part 2 - Crossover design, Aura NS3-193 / Dayton ND20TB-4
• Hi-Vi W5 / Vifa D27SG15 HT system - A small, high value, shielded HT design
• Hi-Vi B3S Single Driver System - The best 3" wide range speaker
• Seas L18 / 27TBFCG - An all-metal system with new Seas drivers
• Vifa XG18 / Seas 27TDFC MTM - A large MTM with smooth clean sound
• Seas L15RLYP / 27TFFC System - Mid level, high value, high resolution system

Current driver tests:

• Small Driver Comparison - All types of drivers of 4.5" or smaller - Added Visaton Ti100 and Vifa PL11WH09-04
• 5.5" Driver Comparison - A roundup of extensively tested midwoofers - Added Seas ER15RLY and MCM 55-1290
• 6.5" to 7" Driver Comparison - A roundup of large midwoofers and fullranges - Added Seas ER18RNX
• Tweeter Mishmash - A large and varied collection of tested tweeters - Added Seas 27TTFNCGW
• Battle of the Non-Domes - Tests of planar and ribbon tweeters
• Tidbits - Misfit measurements that don't have a home in one of the other groups.

Other projects

• Best Buy Insignia - Measurements, mods and comments of the strangely popular ultra-cheap speaker
• DIY Visit to Tymphany - Mark Krawiec and John Krutke Visit Ken Kantor and crew
• Tweeter Off Axis Response - Discussion and comparison of many types of tweeters
• Common Enclosures in 2.5-Way Systems - Effects of a .5 BSC woofer sharing volume with the main woofer
• Horn loading a standard dome tweeter - An experiment that turns out pretty well
• Effect of temperature on a woofer - Why car audio sucks in freezing/blazing states like Wisconsin
• The Archives - A small portion of some projects I've built in the past.
• Friends of Zaph|Audio:
• Greg Givler's GR M130 / Fountek JP3 - Pulling off a great ribbon design

Commentaries and rants:

• Evaluation Myths Busted - Subjectivity vs objectivity, audiophile power words, etc.
• Design Mantras - My common speakerbuilding concepts and theories.
• SoundEasy Setup - Why I chose SE and how I use it
• Surface mounting woofers and tweeters - You knew it had negative effects, but how bad?
• Woofers with lower Xmax sound better - Yup, you read that correctly.
• Whispermat vs BlackHole 5 - Which is the best damping material?
• About Me - Audiophile Beliefs and Rants - Snake oil dispelled!

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Καλά τα πήγε!

Ekta XT

(Bασισμένος σε σχέδιο που δίνει ο Troels Gravesen στο site του)

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Kαι το Ekta Grande δεν είναι κακό βέβαια....

 

[Μιχαλης Σπερτος]

Meisterwerke :bravo:

 

[Μιχαλης Σπερτος]

And another Classic

HONDA CB 750 Four :cool_1:

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Xαχα! Θεός! :respect:

 

[hunters1977]

http://diyaudioprojects.com/Speakers/FE127E_SB/FE127E_SB.htm

Αλλο ενα με κατασκευες ηχειων.
Συγχωρεστε με αν εχει ξαναδοθει

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Συνέντευξη του Troels Gravesen στο AV Enthusiast.

Danish biochemist Troels Gravesen has received a lot of well-deserved attention for his outstanding DIY loudspeaker projects. Troels' projects are always well documented, use premium drivers and have beautiful enclosure designs, giving aspiring loudspeaker builders a roadmap toward building status designs that would retail for exponentially more money if they were commercial loudspeakers. His site also features projects of his that others have built, giving us a chance to see different interpretations of his plans. Jantzen Audio sells kits that Troels has designed using Parts Express enclosures, for those whose carpentry skills may be suspect.

In this month's AV Enthusiast Interview I am pleased to host loudspeaker designer Troels Gravesen, who generously agreed to share his thoughts with us...

Διαβάστε τη συνέντευξη εδώ: AVEnthusiast.com

 

[jimazz]

ψάχνοντας τον τελευταίο καιρό για diy ηχεία, κατέληξα στο συμπέρασμα οτι στο εξωτερικό φοριέται πολύ ...

 

[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Allow me a minor digression here: Basically people choose speakers from looks and in particular brand. Psychology tells us that our need for identification is greater than our need for sensoric satisfaction. This means that we feel better when choosing a speaker from a well known brand and that we will turn down a speaker from an unknown producer despite having a better sound.

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[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

...if we want high efficiency plus low-end extension, we have to give in on size. We need big speakers, sometimes even really big speakers. Commercially we are already seeing designs with 8-10” drivers in fairly small cabs claiming 95-96 dB sensitivity. If we’re talking 40-60 litre volume, we can be absolutely sure these speakers won’t say much below 60 Hz. It’ can’t be done. A German producer of high-efficiency speakers has co-launched a tiny little box meant to go in between pre-amp and power-amp – and oh yes, we have bass equalization to overcome the lack of bass. Do we miss the tone controls of our old pre-amps? Indeed we do when we claim 95 dB and a 40 Hz bass extension from small cabinets. And even tone-controls won’t make 40 Hz from a design that cannot reproduce 40 Hz to any significant level. What we do is lifting the 50-100 Hz region and I don’t say this is bad at all. I don’t think there’s anything wrong in equalizing a sloped bass response flat down to 50 Hz if this is the potential of the design. Most bass is in this region and from personal experience with 8” Supravox drivers, having Fs = 65 Hz, we can get surprisingly good bass – in huge cabs!

What I have tried in my JA8008 design is to combine some of the features from both worlds. Modern, well made high-efficiency drivers plus proper crossover management. The latter feature leaves out the “single cab people” as target customers, but these guys are hard to please anyway. Some SET people believe you should run one single driver and sometimes only have a supertweeter handling the upper octave run from a single capacitor. It’s an apparent non-compromise approach, which to my ears implies a lot of compromises as very few drivers can handle e.g. 50-8,000 Hz range properly. There are a few designs that come close as long as you don’t push them too hard, e.g. Supravox and presumably the French PHY-PH drivers. The latter I haven’t heard.

I’ve heard non-whizzer Lowthers run this way with noticeable distortion in the treble range. The extremely thin paper cones simply break-up as soon as you crank up the volume just a little bit. But high-efficiency speakers are certainly not only meant for low-wattage valve amp enthusiasts. Any decent sounding solid state amp may benefit from not having to deliver loads of amperes into in-efficient bass drivers.

What we get from high-efficiency speakers is the speed and transient attack we simply cannot get from heavy cones. No matter how many watts we put behind, we cannot accelerate a heavy cone as fast as a lightweight cone. Simple physics.

What we can have from high-efficiency speakers is balanced tonality, proper phase tracking between drivers in the crossover region and we may be able to address overall power response much better than we could previously. There’s nothing new in this. Studio technicians have made speakers like this for their own application for decades. What we’re seeing now is the attempt to sell this concept for home audio with one little exception: Size. We badly need to educate consumers on the relation between size, efficiency and bass extension.

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[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

I can’t say I’m targeting a particular sound, as “sound” as such can hardly be described. Our vocabulary is poorly suited to describe sound, where I think we are much better in describing e.g. taste and smell. I’ve read about native tribes living in particular humid environments describing “colour” as grades of moisture or grades of “wet-ness”. The inuits have numerous words to describe the condition of snow, but despite having had loudspeakers around for more than 100 years, I still think we’re poor in describing sound.

We use words stolen from other areas, e.g. smooth, silky, etc. I’ve read about the reproduction of violins from a particular speaker being “silky”. Well, if you stand right next to a violin, we can hardly describe the sound as being “silky”. If this loudspeaker makes violins sound silky there’s probably something wrong about it. I’ve recently read the term “pillowy”about treble performance. Now that’s a new one. Clearly shows how much trouble we have in describing sound.

What I try to target in my final voicing of my speakers is a proper balance of basic notes and upper tones. I often use the BBC dip to render this balance and it may to some ears be a slightly laid back voicing. Many commercial designs balance the treble 1-2 dB above average level, because treble sells. If you go into a shop and swap between a range of speakers, most people will pick the most bright sounding speaker. A bit like pushing the loudness button on an old amplifier. More bass and more treble. You can’t stand it in the long run, but it sells.

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[Κώστας Φ.]

Απάντηση: DIY Loudspeaker Projects

Btw, ένα ενδιαφέρον νέο σχέδιο του Gravesen με μεγάφωνο της Audio Technology και ribbon tweeter... Έρχεται και έκδοση 2.5 δρόμων.

ATR
High-End Kit for Beginners

The ambition of this project is to offer a high-end kit that even beginners in loudspeaker building can cope with. Thus a two-way loudspeaker with state-of-the-art drivers, a fairly simple crossover and a cabinet suggestion that is easy to construct. The kit is built around some of the best drivers Danish loudspeaker industry can offer. AudioTechnology drivers are the fruit of all experiences gained by Eivind and Per Skaaaning from starting the ScanSpeak and Dynaudio companies.

The 18 cm driver used here is made to our specifications and provides a thoroughly vented chassis and magnet structure. The copper clad magnet polepiece provides an almost flat impedance profile and reduces non-linear distortion. The chosen voice coil impedance makes this construction well suited for valve amplification although not for 5-10 watt SET. 25-40 watts PSE or push-pull is recommended minimum. Obviously any high-quality solid-state amplifiers may perform just as well.

The tweeter is designed and manufactured entirely by Raidho, Denmark. The FTT75-30-8 drive unit used here provides a ribbon diaphragm operating as a slightly vented unit, thus needs a small closed cabinet for proper performance. The planar unit holds an extremely low moving mass, exceptional extension and power handling, but most importantly of all, ideal dispersion characteristics when it comes to integration with a conventional dynamic driver. The end result is speed, resolution and dynamic integrity that leaves conventional dome tweeters far behind.

The basic characteristic of this construction is transparency above all. A seamless integration of drivers provides enhanced insight into the music and the bass reaching down to 40 Hz delivers a solid foundation for any source material. The ATR kit provides an efficiency of 87 dB/1W/1m for the two-way system and 91 dB for the 2½-way system. Cabinet dimensions are 25.4 x 31.8 x 43.2 cm (W x D x H) for the 2-way set-up. Read details below. The kit includes all drivers and crossover components for two speakers, either with Jantzen Audio Cross-Caps capacitors or audiophile Superior Z-Cap capacitors, thus 4 versions are available.


Περισσότερα εδώ.

 

[Κώστας Φ.]

Update με νέες μετρήσεις μεγαφώνων από το φίλο μας τον Zaph: Click

Scanspeak, Vifa, Seas, Tangband, Usher, Dayton...Όλος ο καλός ο κόσμος.

 

[PAULT]

Απάντηση: DIY Loudspeaker Projects

Φοβερός ο τύπος και τεράστια βοήθεια για τους απανταχού ντιούηδες
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