forumpoweraudio.ro

Salut , as vrea sa stiu daca pt un amplificator de 180w rms 4 ohm va suna bine un subwoofer de 250w rms 4 ohm ?

Dar de ce sa nu sune bine ?
Difuzorul e unul chinezesc ? dar amplificatorul ? nu de alta dar sa nu ramai fara ambele ...

subwooferul este JVC - CS-G1200U iar amplificatorul KENWOOD - KAC-8405 , totussi ma gandeam ca ar fi de preferat
un subwoofer de putere mai mica , ce ziceti de KENWOOD - KFC-W112S 200w rms doar ca e de 8 ohm (constructorul declara 4 ohm pe situl oficial insa pe subwoofer scrie 8 ohm, aiurea nu? si cica e o marca care se respecta KENWOOD ), am vazut ca la acesta este specificata si capacitatea incintei reflex nu doar pt cea inchisa ca la jvc ,doar ca e de 8 ohm si nu stiu cam cat ar afecta ,amplificatorul meu in punte scoate la 4 ohm 180w rms la 8 ohm nu stiu valorile, ar fi bun acest subwoofer ?

Amplificatorul ideal trebuie sa poata debita cel putin 2xRMS puterea difului.
Amplificatorul tau e 180W/4Ohm = 90W/8Ohm;
Daca subwoferul este 200w/8Ohm ai nevoie de un amplif 400W/8Ohm(sau 800W/4ohm).
Concluzia e ca subwoferul tau va fi subamplificat, si nu va face zgomot pe atat cat ar putea.

Care din urmatorele subwoofere ar fi mai indicat pt amplificatorul meu KENWOOD - KAC-8405 = 180w rms la 4ohm:

Infinity REF 1260W


THIELE-SMALL PARAMETERS
VOICE COIL DCRESISTANCE: REVC (OHMS) . . . . . . 3.59
VOICE COIL INDUCTANCE@ 1KHZ: LEVC (MH) . . . . . . . 2.89
DRIVER RADIATING AREA: SD
(IN2) . . . . . . . . 82.30
S
D
(M2) . . . . . . . 531.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 16.90
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 2.92
VAS (LITERS) . . . . . 82.96
SUSPENSION COMPLIANCE: CMS (µM/N) . . . . 206.00
MOVINGMASS, AIR LOAD: MMS (GRAMS). . . . 222.00
MOVINGMASS, DIAPHRAGM: MMD (GRAMS) . . . 214.00
FREE-AIR RESONANCE: FS
(HZ) . . . . . . . . 23.50
MECHANICAL Q: QMS . . . . . . . . . . . 6.99
ELECTRICAL Q: QES. . . . . . . . . . . 0.41
TOTAL Q: QTS . . . . . . . . . . . . 0.39
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . 0.314
HAG (MM) . . . . . . . . 8.00
VC (IN) .. . . . . . . . . 1.34
HVC (MM) . . . . . . . . . . 34
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . 0.512
X
MAX (MM) . . . . . . 13.00

http://ch.infinitysystems.com/tl_files/ ... _PI_EN.pdf


JBL GT5-12 SPECIFICATIONS


DIAMETER: 12" (305MM)
SENSITIVITY (2.83V @ 1M): 90dB
POWER HANDLING: 275WRMS 1100WPEAK
FREQUENCY RESPONSE: 27Hz – 450Hz
NOMINAL IMPEDANCE: 4 OHMS
VOICE-COIL DIAMETER: 2" (51MM)
DIMENSIONS:
THIELE-SMALL PARAMETERS
VOICE-COIL DC RESISTANCE: REVC (OHMS) . . . . . . 4.00
VOICE-COIL INDUCTANCE @ 1KHZ: LEVC (MH) . . . . . . . 1.26
DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 82.15
SD (M2) . . . . . . . 530.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . . 15.2
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . . 1.9
VAS (LITERS) . . . . . . 54.2
SUSPENSION COMPLIANCE: CMS (μM/N) . . . . 135.00
MOVING MASS, AIR LOAD: MMS (GRAMS). . . . 223.00
MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 216.00
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 29.00
MECHANICAL Q: QMS . . . . . . . . . . . 6.39
ELECTRICAL Q: QES . . . . . . . . . . . 0.64
TOTAL Q: QTS . . . . . . . . . . . . 0.58
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . 0.315
HAG (MM) . . . . . . . . 8.00
VOICE-COIL HEIGHT: HVC (IN) . . . . . . . . . 1.43
HVC (MM) . . . . . . . . 36.4
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . . 0.56
XMAX (MM) . . . . . . . 14.2
http://www.jbl.com/resources/Brands/jbl ... 050108.pdf


alpine swe-1244e


Features
Size 12"
Power Handling (RMS/peak) 200W/650W
Power Range (RMS) 50W-200W
Frequency Response 30Hz-500Hz
Nominal Impedance 4 ;
Frequency Response 30 - 500 Hz
Sensitivity (SPL@1W/1m)* 88.7 dB
D.C Coil Resistance (Re) 3.3 ;
Inductance (Le) 1kHz 0.60 mH
Free Air Resonance (Fs) 31 Hz
Equivalent Stiffness (Vas) 102,5 L (3.62 ft³)
Mechanical Q (Qms) 3.3
Electrical Q (Qes) 0.62
Total Q (Qts) 0.53
Linear Excursion [(Hvc-Hag)/2)], One-Way (Xmax 7.5 mm
Magnetic Linear Excursion, One-Way (Xmag) 18 mm
Mechanical Excursion, Peak-to-Peak 21 mm
Gap Height (Hag) 10 mm
Coil Height (Hvc) 24.5 mm
Cone Area (Sd) 529 cm² (82.0 in²)
Voice Coil Diameter 50 mm (2")
Magnet Weight 48 oz (1.36 Kg)

http://italy.alpine-europe.com/fileadmi ... 44E_EN.pdf


mac Audio SX 12 F_0: 25 Hz 30 Hz


Belastbarkeit RMS/max. 300/1000 Watt
Power Handling RMS/max. 300/1000 watts
Impedanz 4 Ohm
Impedance 4 ohms
Frequenzbereich 21 – 500 Hz
Frequency Response 21 – 500 Hz
Schalldruck 90 dB
Sound Pressure Level 90 dB
Außendurchmesser 312 mm
Outer Diameter 312 mm
Lochausschnitt 277 mm
Cutting Out 277 mm
Einbautiefe 145 mm
Installation Depth 145 mm
Fs 25 Hz
Qes 0.44
Qms 6.61
Qts 0.41
VAS 113 Liter
X-max 22 mm
RDC 3.5 Ohm
F_0: 25 Hz
Q_es: 0.44
Q_ms: 6.61
Q_ts: 0.41
V_as: 113 Liter
X_max (absolut): 22 mm
R_dc: 3.5 Ohm http://www.mac-audio.de/index.php?id=33 ... 3af3865051


vreau sa il montez in incinta reflex. MS