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EQ of two channels

This amplifier has two inputs with separate gain controls, then a 4-band equalization section. My question is, do both channels get mixed and passed through the same EQ? I ask because my guitar pickup is piezo-electric, so I have to taper the equalization down to nothing on the high end, and would like to be able to use the microphone input flat...

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The microphone input goes through the same equalization path as input 2: determined by blowing on the mike and hearing a change in speaker sound with changing high band EQ

Posted on Jun 11, 2008

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Problems hooking up carver17 to equalizer


Take the input jacks out of the carver, plug in into the EQ inputs, then plug another cable into the EQ out then plug those cables into the carver inputs. You good to go.

Dec 21, 2013 | Carver Amplifiers & Preamps

1 Answer

I need an owner's manuel for a Pioneer stereo power amp SPEC-4. I have a part # ARB-235. I think this amp is a product of the 1970's. Where would I be able to get my hands on the operating instructions?...


You can register with hifiengine.com andfind it and the service manual.

There really isn't a lot to a power amp to be operated. This one differs from most in that it has an input level control and VU meters.

From http://images.google.com/imgres?imgurl=http://www.incomesixdigits.com/spec4/spec4a.jpg&imgrefurl=http://www.incomesixdigits.com/spec4/&usg=__WbFLwPqHXjFHe_P2BCKyTT9CxQY=&h=652&w=1156&sz=526&hl=en&start=2&um=1&itbs=1&tbnid=5SVKh2leUGWXmM:&tbnh=85&tbnw=150&prev=/images%3Fq%3Dpioneer%2Bspec%2B4%26hl%3Den%26rlz%3D1R2ADFA_enUS360%26sa%3DX%26um%3D1


Dynamic 150 + 150 Watts Power Output, Generous High-power Design
The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage. This provides a stable operation and also high gain over a wide frequency range. The pre-driver stage is a class A amplifier circuit with a regulated current circuit for the load. This makes for high-gain amplification with superior linearity. Furthermore, there is an overdrive limiter and power limiter circuit which is designed to protect the power transistors and make for added reliability.
The power stage employs a 3-stage Darlington pure complementary parallel SEPP circuit.
The SPEC-4 delivers Continuous Power Output of 150 watts per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion.

Completely Independent and Perfectly Stable Left / Right Power Supplies
The mighty power supplies are completely separated for the left and right channels. Also, each channel is provided with two 22,000uF large-capacity electrolytic capacitors and large transistors with a superior regulation. They achieve outstanding channel separation and a clear, powerful reproduced sound, in addition to the wide frequency response. There is a built-in surge killer circuit to suppress inrush currents from the power transformers and high currents which charge the electrolytic capacitors. This circuit ensures that none of the parts are affected by these adverse currents.
Protective Circuits Composed of Fast-response Relays and Electronic Circuits
Each channel is protected by a DC and over current detection relay circuit. In the event of the speaker terminal shorting due to poor connections or when DC current is generated in the output, the output circuit is immediately disengaged and the speakers and transistors are safeguarded against any possible damage. The protective circuits also function as muting circuits when the power switch is turned on and off.
Peak Level Meters with Outstanding Waveform Response
This power amplifier incorporates logarithmic compression peak meters with a wide scale (-40 -+3dB). With 8-ohm speakers, they allow the output to be read out from 0.01W to 300W. Moreover, the meters feature a fast response for peak signal indication. In addition to the peak output reading, it is easy to interpret the dynamic margin with respect to the SPEC-4’s clipping level.
Input Level Controls with dB Calibration
The SPEC-4 is equipped with input level controls with direct readout attenuation values (-dB). These can be used to continuously adjust the input levels for each channel in accordance with the rated output voltage of the preamplifier. In this way, the SPEC-4 can perform the proper gain control according to the preamplifier’s output level. The preamplifier will thus be used in the condition possible for the best S-N ratio and distortion characteristics.
Stylishly Professional Front Panel Design
Just as you would expect from a sophisticated system, the SPEC-4’s front panel is professionally designed with the large level meters in the center. Also. The front panel’s dimensions allow the model to be mounted in an EIA standard rack, just like real professional-use amplifiers.
SPECIFICATIONS
ICs………………………………........................................2
Transistors………………………………...........................61
Diodes……………………………….................................62
Power Amplifier
Circuitry………………………………Current mirror loaded differential Amplifier
3 stage darlington parallel push-pull
Direct-coupled OCL. (DC amplifier construction)
Continuous Power Output of 150 watts * per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion, or 180 watts per channel at 4 ohms from 20 Hertz to 20,000 Hertz with no more than 0.03% total harmonic distortion.
Total Harmonic Distortion (20 Hertz to 20,000 Hertz, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….......................... 0.01%
1 watt per channel power output……………………………….............................0.01%
Intermodulation Distortion (50 Hertz to 7,000 Hertz = 4:1, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….........................0.005%
1 watt per channel power output………………………………........................... 0.005%
Frequency Response………………………………...............5 Hertz to 100 kHertz +0/1 dB
Input (Sensitivity / impedance)……………………………............................1V/50k ohms
Output
Speaker……………………………….................................................4 ohms to 16 ohms
Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms……………………………….........100
Hum and Noise (IHF, short circuited, A network………………………………........11 5dB
Miscellaneous
Power Requirements………………………………...................................AC 120V 60 Hertz
Power Consumption………………………………..........................................760 watts (UL)
Dimensions………………………………..............................480(W) x 187(H) x 445 (D)mm
18-7/8 x 7-3/8 x 17-7/16 in.

Feb 10, 2010 | Amplifiers & Preamps

1 Answer

Yamaha RX-797 iPod Integration


I have a question first... are the 901's amplified by a separate amp as they should be in a multi-channel (non-stereo) setup?

Better yet read the following then decide if you have iy set up right to begin with. If so, I'd just treat the Ipod or Mac as auxilliary inputs on the receiver. :

I wrote most of this for a different receiver, but if you account for minor differences to your receiver this will work just fine.

There's good news and bad news. The bad news you need a separate amp because a multichannel receiver with Bose 901's attached as recommended for a standard stereo receiver will only sound right in STEREO on stereo analog material. The other speakers around the room are not designed to receive its Active Equalization and if you engage your Tape Monitor you will NOT BE ABLE TO HEAR DIGITAL sources at all. Tape Monitor is for analog stereo material only and on modern AV receivers it disables any digital inputs so you really can't use the Tape Monitor circuit or attached devices for modern digital sources. However, you can still employ the various DSP options to spread 2-channel analog source material around the room. I do.

The good news. I have a setup similar to what you want to do and it works great!

A separate stereo amp for the 901's was my solution. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.

You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.

** Front Pre Out (or one of your analog Tape Outs) >>> Bose EQ Amplifer IN, then
Bose EQ Amplier OUT >>> new amplifier IN.

Attach the 901's to the new amp, set its volume to Max and run through your receiver's speaker level setup.

Write off the Tape Out as an input if you use it to extract the Front L&R channels. DO NOT monitor it or you'll chop the 901's out of the signal path AND kill any digital source audio in the receiver.

Jul 02, 2009 | Yamaha MX-D1 2-Channel Amplifier

1 Answer

HOW TO INSTALL THE 15 BAND EQUALIZER TO THIS


Hi,

I dont know this amplifier, but if there's a tape-monitor button, you can insert the eq on the tape in- and output.

Kind regards,
Gerard

Jun 17, 2009 | Amplifiers & Preamps

3 Answers

How to connect the FISHER EQ-273 equalizer to the FISHER CA-885


It goes between whatever you are using to create the sound and the input to the amplifier.
e.g. for a standard HiFi.. HiFi aux out to equalizer input... equalizer output to amplifier aux input.
Trying to keep left and right channels the same through out. They are usually colour coded. Red = right Left = white.
Hope that helps.
We all start somewhere

Mar 18, 2009 | Amplifiers & Preamps

1 Answer

Bass/Treble balance on Bose Lifestyle 5


You need to go into your menu and set the "MOVIE EQ" to your liking. That is where your bass/treble balance is on a Lifestyle system.

Mar 01, 2009 | Bose Lifestyle SA-2 2-Channel Amplifier

2 Answers

Yamaha rx-797 w/Yamaha ge-60 eq utilizing prein/main out ..and ad


It sounds like you want to use the external amp rather than the internal one. If that is the case, just connect the output of the EQ to the input of the external amp. All you are doing is inserting the EQ between the amp stages now. Using the mx-1 rather than the internal amp is no different.

Dan

Feb 25, 2009 | Yamaha MX-D1 2-Channel Amplifier

1 Answer

Connect a kenwood amplifer to a graphic equalizer


There are several ways to hook up a EQ to amp. If you have a tape monitor unused, you can plug tape-in of amp to 'out' of EQ.
Plug tape out of amp to 'in' of EQ (both channels). When you engage monitor on amp, EQ will work.

May 28, 2008 | Amplifiers & Preamps

1 Answer

Bose 901 equalizer


Hi Mark, had a look for a manual on your Yamaha, but not got to one as yet. Does it have any RCA connections on the back marked as preout prein? best place to put the 901 EQ is in line with L and R front channels at this preout prein point.

Some amps DO NOT HAVE IT. If our does not, then you could connect it in the tape loop, tape out(rec) to input on the EQ. and the output of the EQ connected to tape in(play), but connected like this, the EQ would affect the tone across all channels(unless you are just running a stereo rig, then this way works great!!) Try this and you may just have solved you problem anyway.

regards
Graeme

Mar 28, 2008 | Amplifiers & Preamps

1 Answer

Hook up pioneer stereo amplifier model SA-1270


for audio system always you have left and right channels.
get the output (left&right) from tuner---go to equalizer input left&right.---from equalizer output go to amplifier inputs.and certainly from amplifier output to speaker.

Oct 15, 2007 | Amplifiers & Preamps

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