Car Amplifiers

NAD M25 7-Channel Amplifier

amplifier — Wed, 28 Oct 2009 19:34:18 +0000

The NAD M25 7 channel audio amplifier is actually made up of seven individual mono block amplifiers with each channel using a balanced junction FET input stage to eliminate cross-talk, resulting in exceptionally low levels of noise and distortion. Additionally, NAD employs a unique electronic ground isolation circuit to prevent ground loop noise in the system-a common problem with many complex multi-channel systems.

M25 7-Channel Amplifier Features

7 X 160 watts Full Disclosure Power, 20Hz – 20kHz, at less than 0.03THD with all channels driven simultaneously into 8/4 Ohms
Dynamic power of 220 watts at 8 Ohms, 385 watts at 4 Ohms, and 485 watts at 2 Ohms
NAD’s Custom-Made “Holmgren” transformer
Precision low noise Input Level Controls
12V Trigger for advanced control options, 1 in
Detachable AC cord

NAD M25 Specs

Power Amplifier

Continuous power out into 8 ohms 7 x >160 W (22.0 dBW)
Rated distortion (THD 20Hz-20kHz) 0.03%
Clipping power (0.1% THD) >180W
IHF dynamic headroom at 4 ohms 3.9dBW
IHF dynamic power
- 8 ohms >220 W (23.4 dBW)
- 4 ohms >385 W (25.9 dBW)
- 2 ohms >485 W (26.9 dBW)
Damping factor >180 W
Frequency response
- 20Hz-20kHz ±0.2 dB
- 3Hz/70kHz -3dB
Input impedance R and C >1 Mohms;C = 180 pF
Input sensitivity (for rated output into 8 ohms) 1250mV+/-50mV
Voltage gain 29.0dB

Physical Specification

Dimensions (W×H×D)435 x 200 x 465.6mm
Net Weight 43.7 kg
Shipping Weight 51.0 kg

NAD M25 photo gallery

NAD M2 amplifier The NAD M2 Direct Digital Ampliﬁer represents a new level...

NAD M2 amplifier

amplifier — Wed, 02 Sep 2009 08:59:10 +0000

The NAD M2 Direct Digital Ampliﬁer represents a new level of ampliﬁer performance by combining the ultra low distortion and noise levels of the ﬁnest linear Class A and Class AB ampliﬁers with the efﬁciency and streamlined signal path of the digital ampliﬁer, the M2 is the ﬁrst implementation of a new ampliﬁer technology called Direct Digital Feedback.

For Direct Digital Feedback to work correctly requires a very wide bit path and very high speed operation. The M2’s extremely wide 35-bit data path allows for compensation to be made without truncating any information in the original signal. Running from a master clock frequency of 108MHz there is enough speed to keep a very wide amplifier bandwidth and very low noise and distortion in the audio band.

The NAD M2 amplifier uses three power supplies, all of them highly efficient switch mode types. Each channel gets its own high current power supply in a dual mono configuration. The Input stage and control sections get their own dedicated supply with multiple regulated secondary voltages for individual sections.

NAD M2 Direct Digital Amplifier Features

Direct Digital Amplifier
2 X 250W Continuous Power at 8 and 4 Ohms
>500W IHF Dynamic Power
<0.004% THD 20Hz – 20kHz from 500mW to 250W
>120dB Dynamic Range
40uV Residual Noise
>2000 Damping Factor at 50Hz +0/-0.5dB Frequency Response 20Hz – 20kHz, -3dB >85kHz
Channel Separation >90dB @ 1kHz, 80dB @ 10kHz
Digital PowerDrive
Digital Soft Clipping (switchable)
5 Position Digital Impedance Compensation Filter

M2 Analogue to Digital Conversion

A/D Conversion for Analogue Inputs
Multi-bit Delta/Sigma 24/216kHz
0.0004% THD
Sample rate 32kHz – 192kHz
124dB S/N Ratio
High Resolution 120dB Digital Attenuator

NAD M2 amp inputs and outputs

Inputs Digital SPDIF: AES/EBU, Coaxial X 2, Optical X 2
Inputs Analogue: Balanced, Single Ended
Processor Loop: SPDIF Optical (Mac PC compatible) out/in
2 Sets of Speaker Binding Posts to facilitate Bi-wiring

M2 Control Options

RS-232 serial data port
IR Input
12V Trigger Input and Output
<1W Standby Consumption
90% Amplifier Efficiency

NAD M2 amplifier photos

NAD M25 7-Channel Amplifier The NAD M25 7 channel audio amplifier is actually made...

Car Stereo Booster with LM2896

amplifier — Sun, 30 Aug 2009 16:34:14 +0000

This car stereo booster uses an LM2896 IC which has two integrated amplifiers. It can be powered with voltages up to 15 volts. The power output is 2.5 watts per channel with an 8 Ω load and supply voltage of 12 volts. Using the bridge tehnique in the circuit gives a power output of 9 watts. The car audio booster can be powered up from 3 up to 15 volts.

The load impedance that can be connected at its output can be either 4 Ω or 8 Ω. The supply voltage and the load impedance influence the output power level. This amplifier circuit is designed as a booster for auto radio/cassette players. The current consumption by maximum power output and a 4 Ω load is 1 ampere.

Car stereo booster circuit diagram

Car audio booster PCB layout

Car booster in bridge connection

To wire the booster as a bridged amplifier, follow the instructions:

Short the input number 2 of the amplifier. This is the input that is connected to the capacitor C14.
Add the additional capacitor Cx and the resistor Rx to the circuit as shown by the dashed lines in the schematic diagram. These parts were considered during the design phase of the printed circuit and appropriate holes, and soldering points are already available on the circuit board.
Instead of using 2 speakers, use a single speaker. Connect the speaker to both output lines of the amplifier as shown by the dashed lines in the booster schematic diagram. You can use either 4 Ω or 8 Ω speaker.
Now, since only a single speaker is connected to the amplifier circuit, you must construct a second amplifier circuit identical to this one if you want a stereo system. The second circuit will work for the second channel.

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Perreaux 250i amp

amplifier — Sun, 29 Mar 2009 09:17:31 +0000

The 250i is Perreaux’s most powerful, most sophisticated integrated amplifier. It’s performance and specifications are truly impressive, but hearing the 250i is when you will truly appreciate the quality engineering, design and craftsmanship. The 250i is the most advanced integrated amplifier Perreaux has ever produced.

The Perreaux 250i amp is designed to handle difficult speaker loads with ease. With it’s high powered MOSFET design, the 250i is capable of continuously delivering a genuine 320Wrms into an 8Ω load and a huge 500Wrms into 4Ω.

250i amp features

General Features

High Power Design

High-current Custom Power Supply

High Damping Factor

Advanced Microprocessor Control

Advanced Stepped Volume Control

Advanced Lossless Stepped Off-Set Balance Control

Non-Invasive Protection

Balanced (XLR) input

Home Theatre/Pass-Through Loop

IR (infrared) input and output

Isolation Feet Options

Internal Headphone Amplifier

Dual sets of speaker binding posts

iPod Input

Trigger input and output

User controles

Interactive Menu System

Infrared (IR) Remote Control

Volume Up/Down

Perreaux 250i specifications

250i Amplifier

Rated Power Output (per channel):

250Wrms into 8Ω

500Wrms into 4Ω

Maximum Power Output (prior to clipping, per channel):

360Wrms into 8Ω

530Wrms into 4Ω

Total Harmonic Distortion + Noise

Typically: 0.002% @ 1kHz, 250W into 8Ω

20Hz to 20kHz: 0.010%, 250W into 8Ω

Damping Factor: 800 @ 1kHz, 250W into 8Ω

Signal to Noise Ratio (unweighted): better than 98dB, ref. 250W

250i Preamplifier

Input Impedance

Unbalanced: 12kΩ

Balanced: 22kΩ

Input Overload

Unbalanced: 8Vrms

Balanced: 8Vrms

Volume Control Range: -95.5dB to +31.5dB

Volume Control Resolution: 0.5dB per step

Input Volume Trim Range: ±40dB

Balance Resolution: 0.5dB

Balance Range: ±40dB

Headphone Amplifier

Headphone Rated Power Output:

1.0Wrms into 32Ω

150mWrms into 300Ω

Headphone Volume Trim Range: ±40dB

Perreaux 250i photo gallery

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Volfenhag amps – Blue lightning series

amplifier — Sat, 28 Mar 2009 12:00:26 +0000

Volfenhag amps are produced by VolfenhagAudio, a German concept, which produces automotive audio accesories like: car subwoofers, speakers, amplifiers, in dash and other accesories.

We continue this series of Volfenhag Audio reviews with next impressive products: the Volfenhag blue lightning series car amplifiers.

The VolfenhagAudio company introduced the blue lightning series of next generation power amps. They have 7 Bridgeable models, 2 of them are 4 channels amps and 1 monoblock digital.

Volfenhag amplifiers specifications

Most of the amplifiers have the same specs, difference is the maximum output power and filters characteristic:

tri-mode capability
2 Ω stable stereo
RCA input, low & high by pressing one switch
RCA preamp line output
P.W.M MOSFET power supply
2 Ohm stereo / 4 Ohm mono
0dB & 18dB Bass boost
Adjustable input sensitivity (0.2V – 6V)
Remote bass control with 20ft wire
Ultra slim 1 1/4″ height easy installation

Volfenhag blue lightning series car amps have blue light illuminated right and left handles, blue light illuminated cooling fan, terminals, soft delayed remote turn on and dual color indicator LED for power and protection circuit.

ZX-8100 2 Channel Bridgeable Power Amplifier 800W

Output power: 800W

Selected X-OVER HPF/FULL/LPF

HPF: 40Hz – 250Hz

FULL: 15Hz – 15KHz

LPF: 40Hz – 250Hz

ZX-8150 4 Channel Bridgeable Power Amplifier 600W

Output power: 800W

Dual X-OVER HPF/FULL/LPF

HPF: 50Hz – 1KHz

FULL: 15Hz – 30KHz

LPF: 40Hz – 250Hz

ZX-8200 2 Channel Bridgeable Power Amplifier 1000W

Output power: 1000W

Selected X-OVER HPF/FULL/LPF

HPF: 40Hz – 250Hz

FULL: 15Hz – 30KHz

LPF: 40Hz – 250Hz

ZX-8290 2 Channel Bridgeable Power Amplifier 1200W

Output power: 1200W

Crossover slope built-in

HPF: 50Hz – 1KHz

FULL: 15Hz – 30KHz

LPF: 40Hz – 250Hz

ZX-8300 4 Channel Bridgeable Power Amplifier 1200W

Output power: 1200W

Selected X-OVER HPF/FULL/LPF

HPF: 40Hz – 250Hz

FULL: 15Hz – 30KHz

LPF: 40Hz – 250Hz

ZX-8400 2 Channel Bridgeable Power Amplifier 2000W

Output power: 2000W

Selected X-OVER HPF/FULL/LPF

HPF: 50Hz – 1KHz

FULL: 15Hz – 30KHz

LPF: 30Hz – 500Hz

ZX-Monoblock Monoblock Digital Amplifier 1800W

1800W MAX OUTPUT

OUTPUT POWER :

650W @ 1Ω

500W @ 2Ω

300W @ 4Ω

Built-in crossover slope

Variable low pass filter (30Hz ~ 250Hz)

Phase shift control (00 & 1800)

Bass boost control (0dB ~ 18dB)

Subsonic control (10Hz ~ 50Hz)

Built-in cooling fan

Daisy chain capability

1, 2, 4 & 8Ω capable

Volfenhag amps photo gallery

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Volfenhag subwoofers

amplifier — Fri, 27 Mar 2009 19:21:52 +0000

Volfenhag subwoofers are produced by VolfenhagAudio, a German concept, which produces automotive audio accesories like: car subwoofers, speakers, amplifiers, in dash and other accesories.

We start this series of Volfenhag Audio reviews with the most impressive products: the car subwoofers.

Its industrial engineered design and structure give this driver the ability to take very large amounts of power hour after hour while delivering ultra clean low distortion very high sound pressure levels.

Volfenhag ZX-4710 subwoofers

ZX4710 DVX 10″ subwoofers are an excellent choice for a very high power Aluminum Cone Competition Subwoofers.

ZX4710 sub specifications

Maximum power: 800W
Aluminium cone
4 OHM + 4 OHM dual voice coil
Aluminium diecast chrome basket
Impedance: 2-8 OHM
Frequency Response: 20 Hz – 1.1 kHz
Sensitivity: 88.62 dB
High temperature 4-layer voice coil
Double stack magnet structure
Push type terminals
Piston surface area: 0.0346m
Efficiency (1W/1M): 88.62dB
Vas: 35L
Dual 4 ohm nominal impedance
Continuous power: 400W
ZX 4710 dimensions
- Mounting depth: 145mm
- Mounting diameter: 235 mm

Volfenhag ZX-4712 subwoofers

ZX4712 is a 1000W 12″ High Power Woofer, part of high performance series with Aluminum Diecast & Cone Next Generation back

ZX 4712 sub specifications

Maxim power: 1000W
Aluminium cone
4Ω dual voice coil
Aluminium diecat chrome basket
Usable impedance: 2 to 8 Ω
Bumped & vented T-Yoke
Double stack magnet structure
Push type terminals
Vas: 56L
Efficiency (1W/1m): 89.58 dB
Piston surface area:: 0.0491m
DC resistance: 3.2 Ω
ZX 4712 dimensions
- Mounting depth: 160 mm
- Mounting diameter: 282 mm

Volfenhag ZX-4715 subwoofers

ZX4715 is a 15″ High Power Woofer 1200W, Aluminum Diecast & Cone Next Generation

ZX 4715 sub specifications

Maximum power: 1200W
4 Ω dual voice coil
Aluminium diecast chrome basket
Impedance: 2 to 8 Ω
Push type terminals
Free air resonance: 29 Hz
Vas: 116L
Efficiency (1W/1m): 91dB
DC resistance: 4 Ω
Continuous power: 600W
ZX 4715 dimensions
- Mounting depth: 187mm
- Mounting diameter: 360mm

Volfenhag subs videos

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Primare SPA22 amplifier

amplifier — Tue, 24 Mar 2009 18:34:31 +0000

The Primare SPA22 is a 5×120W integrated A/V amplifier and digital controller and is the natural successor to the award-winning SPA21, which was recognised around the world for its ease of use and ‘hi-fi’ sound quality. As the first of a new generation of Primare home entertainment products however, the SPA22 represents a considerable evolutionary advance in terms of design, performance, user flexibility and versatility.
SPA22 is a surround processor and amplifier which is able to further upgrade, with a plug-in board option that allows you to prolong its use in your home before you ditch it for a better model.

The new SPA-22 combines the advanced control flexibility and upgradable topology of the SP32 with five discrete channels of amplification rated at 120W each. The amplifiers are of a new type of purified Class D/switch-mode design.

The Primare SPA22 provides three switchable HDMI v1.3 inputs and a single HDMI output for audio and video, incorporating a user-selectable audio processing and bypass function. HDMI v1.3 capability is significant because it carries uncompressed multi-channel PCM audio from a Blu-ray player to the SPA22’s DACs and beyond to the amplifiers and loudspeakers.

SPA22 Primare amplifier features

Modular design architecture
1080p HDMI Switching. Component / Composite / S-Video
5 x 120 Watts (all channels driven simultaneously)
Multi-channel PCM compatible
Dolby® Digital, Prologic IIX, EX 7.1, dts®, dts-ES 6.1, Neo6
Re-Routable Front Channels in 7.1 Mode
DVD-A & SACD 7.1 Input.
Fully Configurable & Format independent Bass Management
Discrete IR & Full RS232 Operation.
Programmable Triggers
Available in Black or Titanium.

SPA22 amp specifications

Output Power: 5 X 120W 8 Ohm
Analogue Inputs: 8 RCA (L & R)
Digital Inputs: 3 RCA (L & R) / 3 TOS-Link
Video Inputs: 4 Composite, 3 S-Video / 3 Component 3 HDMI
Modes: Stereo/ Bypass/ Party/ Dolby®, Prologic IIx Movie/ Dolby®, Prologic IIx Music/ DTS® Neo:6 Movie/ DTS® Neo:6 Music
Power Consumption operate: 800W at 1K, 8R ,120W all channels driven
Bandwith: 1 Hz – 100 kHz – 1 dB
THD: < 0,005 %, 20 Hz – 20 kHz
Signal-to-Noise Ratio: -110 dB
Frequency Response: < 10 Hz – 100 kHz, 1 dB
Output power 1khz, one channel driven: 8Ω 150w THD+N <1%/ 4Ω 300w THD+N <1% AP AUX 0025 Filter
Output power 1khz, all channels driven: 120w 4/8Ω THD+N<0.1% AP AUX0025 Filter

Primare SPA 22 amp photos

See Primare official site.

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LM386 circuit audio amplifier

amplifier — Sun, 22 Mar 2009 14:57:44 +0000

The LM386 circuit is a audio amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.
The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation.

LM386 circuit features

Battery operation

Minimum external parts

Wide supply voltage range: 4V–12V or 5V–18V

Low quiescent current drain: 4mA

Voltage gains from 20 to 200

Ground referenced input

Self-centering output quiescent voltage

Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ω, PO = 125mW, f = 1kHz)

Available in 8 pin MSOP package

LM386 circuit applications

AM-FM radio amplifiers

Portable tape player amplifiers

Intercoms

TV sound systems

Line drivers

Ultrasonic drivers

Small servo drivers

Power converters

LM 386 series output power (Pout)

LM386N-1, LM386M-1 at VS = 6V, RL = 8ohms, THD = 10% is 250-325 mW

LM386N-3 at VS = 9V, RL = 8ohms, THD = 10% is 500-700 mW

LM386N-4 at VS = 16V, RL = 32ohms, THD = 10% is 700-1000 mW.

LM 386 amp circuit 20dB gain

LM386 Audio Amplifier with Gain = 20 and minimum part count.

LM386 audio amp 50dB gain

LM386 amplifier 200dB gain

LM 386 bass boost circuit

To make the LM 386 a more versatile audio amplifier, 2 pins ( pin 1 and 8 ) are provided for gain control. With pins 1 and 8 open the internal 1.35k resistor sets the gain at 20 (26 dB). If a capacitor is placed between pin 1-8, bypassing the built-in 1.35k resistor, the gain will go up to 200.

If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to 200. Gain control can also be done by capacitively coupling a resistor or FET transistor from pin 1 to the ground.

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TDA 2005 amplifier

amplifier — Sun, 22 Mar 2009 14:27:42 +0000

TDA2005 is a 20W is a bridge amplifier for car radio. The TDA 2005 is classB dual audio power amplifier in MULTIWATT) package specifically designed for car radio application : power booster amplifiers are easily designed using this device that provides a high current capability (up to 3.5 A) and that can drive very low impedance loads (down to 1.6W).

TDA2005M/S pin connections

TDA 2005 maximum ratings

Operating Supply Voltage 18 V

DC Supply Voltage 28 V

Peak Supply Voltage (for 50 ms) 40 V

Output Peak Current (non repetitive t = 0.1 ms) 4.5 A

Output Peak Current (repetitive f . 10 Hz) 3.5 A

Power Dissipation at Tcase = 60 °C 30 W

Storage and Junction Temperature – 40 to 150 °C

TDA2005M is designed for bridge applications and TDA2005S for stereo application.
With TDA 2005S you can build a 2 x 10Watt stereo amplifier circuit on 2 x 2Ω speakers with 10% distorsions.

TDA2005 bridge amplifier schematic

This 20W bridge amplifier is build with TDA2005M.

TDA 2005 stereo amp schematic

A 2 x 10W stereo amplifier circuit schematic build with TDA2005S.

This 2 amplifiers circuits built with TDA2005 circuits have not been tested.

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NAD M3 amp review specs

amplifier — Sun, 22 Mar 2009 12:03:54 +0000

NAD M3 amplifier review: is a Dual mono integrated amplifier with 2-channels of 180-watts of pure power. The NAD M3 amp offers internal switching for two pairs of speakers and tone controls as well as a second Zone 2 output with independent commands and even its own remote control.
Performance features include a precision volume attenuator with 0.5dB steps and a range of 87.5db, a remote balance control with 0.5dB steps, and a Mode control which allows stereo, left only, right only and mono settings.

Tone controls offer bass and treble adjustments as well as a “spectral tilt” option that is highly effective at correcting the tonal balance of many recordings by simultaneously increasing the bass and decreasing the treble (and vice versa) to create a warmer or cooler balance. There are also a second set of preamp outputs and a switchable high-pass filter for the internal amplifier.

The M3 is NAD’s concept of the ideal musical companion, capable of transporting the listener to that place where the music simply exists in its own perfect space. For this task we have pushed classical analog circuit design to unprecedented levels of performance. The total lack of audible noise and distortion is the result of some very sophisticated analog engineering, and rather surprisingly, the use of digital control.

NAD M3 Dual Mono Integrated Amplifier Features

180 watts X 2, 10Hz – 20kHz, with 0.03THD, both channels driven into 8 or 4 Ohms
Dynamic power of 280 watts at 8 Ohms, 480 watts at 4 Ohms, and 785 watts at 2 Ohms
PowerDrive
Dual stage high current/high voltage power supply
Dual Mono topology
Twin NAD Custom-Made “Holmgren” Toroidal transformer
Ultra precise multi-stage electronic volume control using discreet resistors
7 inputs, including 1 balanced XLR
Tape/Zone 2 output (independent source selection, no volume control)
Speakers A B with custom 5 way binding posts
Biamp mode with selectable 40, 60, 80, 100 Hz crossover frequency on Pre Out 1
Powered subwoofer
Main Amp input
Remote Bass and Treble controls with Spectral Tilt option
Remote Balance control with 0.5 dB steps
Selectable Mono, Left, Right, and Stereo options
RS-232 interface for advanced custom installations
12V Trigger for advanced control options, 1 Out
3.5mm IR Control jacks, 1 In and 2 Out
Detachable AC cord
M3 System Remote Control
ZR 3 second zone remote

NAD M3 specifications

Input impedance (R and C) 150k//500p
Input sensitivity ref. 0.5V 446mV
Signal/Noise ratio, A weighted ref 0.5V >110dB (AWTD)
Frequency response (-3dB 3Hz – 70kHz) <+/-0.3dB
Voltage gain (max volume) 29dB

Controls (Volume Setting @ 12:00 position)

Treble ±5dB
Bass ±5dB

NAD M3 Power Amp

Continuous average power output into 8ohms 2 x 180W (22.5dBW)
Rated distortion (THD 20Hz-20kHz) 0.004%
Clipping power (max cont. power/channel) 220W (23.4dbW)
IHF dynamic headroom at 8ohms 4.2 dB
IHF dynamic power
- 8 ohms 280W (24.5dBW)
- 4 ohms 480W (27.2dBW)
- 2 ohms 785W (28.4dBW)
Damping factor >150
Frequency response 20Hz-20kHz ±0.03dB
Input impedance R and C 20k ohm/ 680pF
Input sensitivity (for rated output into 8 ohms) 1.38V
Signal to noise ratio, A-weighted
- ref. 1W >-107dB (AWTD)
- ref. rated power >-130dB

NAD M3 physical specs

Dimensions (W×H×D)
- Imperial 17 1/8 x 5 1/4 x 15 3/16”
- Metric 435 x 135 x 386mm
Net Weight
- Imperial 51.8 lbs
- Metric 23.5 kg
Shipping Weight
- Imperial 67.0 lbs
- Metric 30.5kg