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Descriere
The PTT6.5W04-NFA-01 is the standard stroke 6.5″ bass-midwoofer from the PURIFI woofer family. It incorporates similar breakthrough technology, but due to a reduced excursion limit the efficiency is improved over the PTT6.5X04-NFA-01 long stroke woofer.
Highlights
- A whole new take on driver design
- PURIFI’s Natural Surround
- Extreme low distortion over full excursion range
- Engineered and manufactured in Denmark
- Excellent midrange performance
- High power handling
- Perfect balance between volume displacement and midrange efficiency
Product Details
PURIFI PTT6.5W04-NFA-01 bass-midwoofer
PURIFI is a fresh company that designs and manufactures extreme high performance transducers and amplifier modules. Don’t let the freshness fool you; Their leadership team consists out of some well-respected audio technology pioneers. PURIFI developed a deep understanding of many performance degrading aspects for both amplifiers and transducers. Thanks to this understanding the PTT6.5W04-NFA-01 is the most refined bass-mid woofer from our woofer category.
Besides this 4 ohm version there is also an 8 ohm version, a long stroke version (PTT6.5X04-NFA-01) and a 6,5″ passive radatior available. Looking for similar performance, but something smaller? Take a look at the 4″ PTT4.0W04.
The challenge
Loudspeaker drivers are known to add a large, if not the largest, amount of distortion in an audio signal chain. Reducing this distortion is a challenge with the complication of fine-tuning to improve one part (e.g. harmonic distortion) often results in a degradation of another part (e.g. intermodulation distortion). These distortions consist out of several separate distortion mechanisms. By carefully mapping and completely understanding these mechanisms, PURIFI succeeded in improving the overall performance by a large degree.
A whole new take on driver design
PURIFI developed mathematical models for the motor system, suspension, cone and surround. These models allowed for optimization of each distortion mechanism separately. This systematic approach reduced all distortions mechanisms and keeps intermodulation distortion low. The result makes that the PTT6.5W04-NFA-01 is a compact 6.5” driver that parallels or even surpasses the bass performance of a low excursion, large surface driver, while it also excels in midrange performance.
| The mechanism | Improvement |
| Low force factor modulation | Current through the voice coil is not distorted by cone movement. Gives undistorted midrange regardless of excursion |
| Constant force factor over excursion – Bl(x) | Prevents amplitude devotions of midrange output during large excursion (sometimes called ‘burbling’) |
| Low surround radiation distortion | Reduces harmonic and intermodulation distortion caused by surround |
| Low magnetic hysteria distortion | Reduces harmonic and intermodulation distortion caused by magnetic traces left by previous cycle |
FAQ
Q: Should I go with this 4 ohm or with the 8 ohm version?
A: Both woofers have similar distortion performance and the T/S parameters are alike. The 4 ohm coils of this PTT6.5W04-NFA-01 allows more current to flow on a similar drive voltage. This gives a higher sensitivity and is preferred in most applications. If you have an amplifier that is not comfortable with low impedance loads or have specific requirements, such as parallel woofers, the PTT6.5X08-NFA-01 might be more favorable.
Q: Why is this surround odd shaped?
A: This is the PURIFI Natural Surround. Conventional surrounds create distortion as they deform. The shape of the Natural Surround reduces cone edge resonances and distortion. It might be odd looking, but form follows function here. A more detailed look shows that the surround actually represents complex sound wave. We are told that the Natural Surround is also called ‘wormy’ by insiders.
Article numberPTT6.5W04-NFA-01
EAN8785256843572
Nominal Diameter6.5″
Power Handling (RMS)250 watts
Continuous Program Power80 watts
Impedance (Z)4 ohms
Sensitivity (SPL at 1m / 2.83V)90.3 dB
Voice Coil Diameter39 mm
DC Resistance (Re)3.7 ohms
Voice Coil Inductance (Le)0.32 mH @ 1kHz
Resonant Frequency (Fs)33 Hz
Mechanical Q (Qms)6.3
Electromagnetic Q (Qes)0.27
Total Q (Qts)0.23
Diaphragm Mass Inc. Airload (Mms)21.1g
Mechanical Compliance of Suspension (Cms)1.10 mm/N
Surface Area of Cone (Sd)132.7 cm2
Volume of Displacement (Vd)78.3 cm3
BL Product (BL)7.7
Compliance Equivalent Volume (Vas)28.9 liter
Maximum Linear Excursion (Xmax)5.9 mm
Driver’s Mechanical Losses (Rms)0.7 kg/s
Cone / Diaphragm MaterialProprietary Fibre Mix
Surround MaterialNitrile rubber
Voice Coil Wire MaterialAluminum
Voice Coil FormerFiberglass
Basket / Frame MaterialAluminum alloy diecast
Magnet MaterialFerro-magnetic
Overall Outside Diameter176 mm
Overall Depth90.2 mm
Baffle Cutout Diameter145 mm
Bolt Circle Diameter166 mm
# Mounting Holes6
Mounting Hole Diameter5.1
Informații suplimentare
| Producător | |
|---|---|
| Disponibilitate | La Comandă * Se aduce la comandă in 3-6 zile. |
| Unitate Pret | Bucata |
| Tip Difuzor | Midwoofer |
| Diametru Difuzor | |
| Impedanta Difuzor | 4 ohmi |
Explicatii in ceea ce priveste rodajul echipamentelor, cat si al cablurilor, asezarea optima a echipamentelor in camera de auditie, importanta acusticii camerei si nu in ultimul rand sistemul de alimentare a intregului echipament:
PENTRU BOXE:
- Pentru performante optime este necesara pozitionarea boxelor la o distanta de minim 30-40cm de peretele din spate pentru boxele cu bass-reflex in spate, pentru cele cu bass-reflex in fata, recomandam pozitionarea la o distanta de 10-20cm fata de peretele din spate, dar totodata la o distanta de cel putin 50cm fata de peretii laterali. Tineti cont de faptul ca orice piesa de mobilier din incapere, joaca rol de absorbtie fonica, dar si de difuzie fonica daca acestea din urma sunt din materiale ceramica sau oglinzi, geamuri sau alt material reflectorizant. In acest sens, gasiti pe blogul nostru, multiple articole care va pot ajuta
- Boxele vor ajunge sa functioneze in parametrii recomandati de producator, dupa minim 50 de ore (ideal 100 ore) de functionare la volum mediu. In aceasta perioada de timp, de “rodaj a boxelor”, sunetul va fi la inceput mai artificial, bass-ul nu va fi inca controlat, inaltele rigide iar vocile usor retinute, pe masura ce boxele vor functiona, veti remarca cum bas-ul devine mai controlat, mai prezent si mai voluminos, vocile si sunetele medii devin naturale si mai echilibrate, iar inaltele devin rafinate si detaliate. Exista boxe care necesita un „rodaj” mai amplu de minim 300 de ore mai ales in cazul celor care au difuzoare de kevlar, carbon sau alte materiale de acest tip. Boxele care se „rodeaza” cel mai repede sunt cele care au difuzoare de celuloza.
Imbunatatirea sunetului unui sistem audio stereo (Partea I)
Imbunatatirea sunetului unui sistem audio stereo – (Partea II)
PENTRU AMPLIFICATOARE, DAC-URI, PREAMPLIFICATOARE, RECEIVER STEREO & HOME CINEMA, SURSE DIGITALE AUDIO-VIDEO:
- Pentru performante optime este necesar „rodarea” echipamentului, In functie de complexitatea componentelor din aparatul dumneavoastra acesta poate dura intre 30-200 ore.
- Rodajul se face la volum minim, fiind astfel suficient faptul ca acesta este alimentat corect conform manualului de utilizare la 220-230 Volti si trece semnal audio sau video dupa caz prin el.
- Echipamentul supus „rodajului” va ajunge sa functioneze in parametrii recomandati de producator, dupa perioada mai sus mentionata. In aceasta perioada de timp, de “rodaj”, sunetul va fi la inceput ceva mai artificial, bass-ul nu va fi inca controlat, inaltele rigide iar vocile usor retinute, pe masura ce echipamentul va functiona, veti remarca cum bas-ul devine mai controlat, mai prezent si mai voluminos, vocile si sunetele medii devin naturale si mai echilibrate, iar inaltele devin rafinate si detaliate.
- In ceea ce priveste echipamentul video precum videoproiector, TV, media player, blueray player, necesita un "rodaj" de cel putin 50 de ore. Lipsa acestuia nu va poate oferi maxim de performanta. "Rodajul" se efectueaza prin simpla utilizare a acestuia, intr-un mod conform specificatiilor mentionate de producator.
PENTRU CABLURI:
- Pentru performante optime este necesara „rodarea” cablurilor, In functie de complexitatea conductorului folosit, cat si geometriei acestuia, „rodajul” poate dura intre 30-100 ore.
- Rodajul se face la volum minim, fiind astfel suficient faptul ca va trece semnal audio sau video dupa caz prin el.
- Cablul supus „rodajului” va ajunge sa functioneze in parametrii recomandati de producator, dupa perioada mai sus mentionata. In aceasta perioada de timp, de “rodaj”, sunetul va fi la inceput ceva mai artificial, pe masura ce cablul va functiona, veti remarca cum bas-ul devine mai controlat, mai prezent si mai voluminos, vocile si sunetele medii devin naturale si mai echilibrate, iar inaltele devin rafinate si detaliate.
Articole indrumatoare:
Tratamentul Acustic si Izolarea Fonica
Pentru un sistem echilibrat, trebuie tinut cont pe langa asezarea corecta a boxelor in incapere, al echipamentelor, sistemul de alimentare al acestora, tinand cont de instalatia electrica a locatiei.
Pentru detalii privind aceste aspecte de rodaj si nu numai, va rugam sa ne consultati!
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