Question about DBX -215 Home Equalizer

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Dbx soundfield one speakers

My controller box that came with this unit is not working. Please is there any place to get the schematics as the original dbx co. is long out of business.Thanks T.Y.

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  • Anonymous Sep 19, 2008

    unit has no effect on equalizeing sound.

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I have the same issue. Did you ever find a schematic?

Posted on May 06, 2013

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Hello. Please need the service manual for
dbx Soundfield One

Posted on Sep 17, 2008

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I need schematic for DBX 20/20


Try Googling (DBX)(20/20)(manual) without parens. I have not had much luck finding Dbx information.

Jul 28, 2016 | DBX Equalizers & Crossovers

1 Answer

Hi. I am looking for a schematic for DBX 1231?


I downloaded them once. I don't remember from where.
I probably still have the file at home, but I don't really want to post my email. There's a separate identical power supply circuit for each side, if you swap them and the problem doesn't swap sides, then both power supplies are good.
More likely the bypass relay for that side is dirty and blocking signal.
They pass the signal unchanged when the unit is turned off.
They are little boxes on the in/out connector board and can't be cleaned because they have no openings. If you can solder, it's a relatively straight forward fix. The challenge is finding replacement relays that operate on the same voltage and have the same pin configuration. If you do replace them do both sides, because they are the same age and you want to fix this problem only once and have both sides the same.

Jul 15, 2014 | DBX 1231 Home Equalizer

1 Answer

Schematic dbx 1231


they are not that complicated...

Jun 09, 2012 | DBX 1231 Home Equalizer

1 Answer

How do you connect the dbx eq to a home stereo system


Be advised that the engagement of any device in a Tape Monitor loop on a late-model Audio/Video Receiver will effectively tie the receiver down to stereo-only analog sound reproduction. I'll explain.

The connections themselves are fairly simple but it pays to understand what happens in the loop.

In general, any Line-Level external processor (EQ, dynamic range expander, etc) will go into a Tape Monitor loop on a receiver. A Tape Monitor, when engaged, sends the stereo analog signal Out to the Processor, massages it and returns it to the receiver via the Tape Monitor IN connectors to be passed on to the receiver's internal processes (volume, tone, whatever).

Old school analog stereo-only receivers consistently work this way. Newer digital and audio/video receivers introduce a couple of problems: 1) digital sound processing to simulate a variety of soundfields; 2) multiple output channels, either discrete or digitally-generated.

The latter requires that whatever signal is being processed experiences a maximum of one analog-digital-analog conversion.

EVERYTHING analog coming into the modern digital receiver is automatically convert ed to a digital signal for internal processing unless you choose a STEREO-only or STEREO-Direct setting. Consequently, no further external analog-digital conversions would be allowed if, say, a Tape Monitor circuit was activated, and a possible feedback loop could otherwise be created in a digital-sourced selection (output to its own input), so the unit is wired to treat the Tape Monitor as the first analog step in the process and defeats any pure digital sources.

In a multichannel unit, what would happen to the other channels if you sent ONLY the Front Left & Right out for processing? They would NOT be processed. That logical problem also plays into the decision to defeat digital sources if the Tape Monitor is activated. I don't totally agree with the engineers but that's the way it is. Nature of the digital beast.

Okay, back to the hook-up: Receiver Tape- or VCR Out to the External Processor (EQ, whatever) Preamp-, Amp-, Tape- or Rec-In; Receiver Tape- or VCR In from the External Processor (EQ, whatever) Preamp-, Amp-, Tape- or Rec-Out.

So, to sum up, you can only use the EQ for analog stereo sources. If you actually want to use an analog recording deck you could place it within the typical Equalizer's own Tape Monitor loop(s). Many have two to facilitate equalized dubbing between decks.

[Or you could obtain a dbx Program Route Selector (check eBay, I highly recommend the 400x, of which I have two) and it would, while only using one receiver Tape Loop, allow for three discrete attachment paths for processors and three for tape decks with the added flexibility of front-panel selection of any and all, with the processors being before, after or between the source or tape decks. Plus it has a dedicated facility for an inline dbx Noise Reduction Processor that can also be juggled around via pushbuttons. Pretty neat.]

Jan 10, 2011 | DBX 215 Home Equalizer

1 Answer

How do I install the dbx 2231 EQ


Like any other eq...

Be advised that the engagement of any device in a Tape Monitor loop on a late-model Audio/Video Receiver will effectively tie the receiver down to stereo-only analog sound reproduction. I'll explain.


The connections themselves are fairly simple but it pays to understand what happens in the loop.


In general, any Line-Level external processor (EQ, dynamic range expander, etc) will go into a Tape Monitor loop on a receiver. A Tape Monitor, when engaged, sends the stereo analog signal Out to the Processor, massages it and returns it to the receiver via the Tape Monitor IN connectors to be passed on to the receiver's internal processes (volume, tone, whatever).


Old school analog stereo-only receivers consistently work this way. Newer digital and audio/video receivers introduce a couple of problems: 1) digital sound processing to simulate a variety of soundfields; 2) multiple output channels, either discrete or digitally-generated.


The latter requires that whatever signal is being processed experiences a maximum of one analog-digital-analog conversion.


EVERYTHING analog coming into the modern digital receiver is automatically converted to a digital signal for internal processing unless you choose a STEREO-only or STEREO-Direct setting. Consequently, no further external analog-digital conversions would be allowed if, say, a Tape Monitor circuit was activated, and a possible feedback loop could otherwise be created in a digital-sourced selection (output to its own input), so the unit is wired to treat the Tape Monitor as the first analog step in the process and defeats any pure digital sources.


In a multichannel unit, what would happen to the other channels if you sent ONLY the Front Left & Right out for processing? They would NOT be processed. That logical problem also plays into the decision to defeat digital sources if the Tape Monitor is activated. I don't totally agree with the engineers but that's the way it is. Nature of the digital beast.



Okay, back to the hook-up:


Receiver Tape Out (Rec) - to the External Processor (EQ, whatever) Preamp-, Amp-, Rec-In;


Receiver Tape In (Play) - from the External Processor (EQ, whatever) Preamp-, Amp-, Play-Out.



So, to sum up, you can only use the EQ or any outboard processor for analog stereo sources. If you actually want to use an analog recording deck you could place it within the typical Equalizer's own Tape Monitor loop(s). Many have two to facilitate equalized dubbing between decks.


[Or you could obtain a dbx Program Route Selector (check eBay, I highly recommend the 400x, of which I have two) and it would, while only using one receiver Tape Loop, allow for three discrete attachment paths for processors and three for tape decks with the added flexibility of front-panel selection of any and all, with the processors being before, after or between the source or tape decks. Plus it has a dedicated facility for an inline dbx Noise Reduction Processor that can also be juggled around via pushbuttons. Pretty neat.]

Sep 23, 2010 | DBX 2231 Home Equalizer

1 Answer

DBX PA+ no settings for Yorkville EF500P and LS801P


yeah that is because Harmon makes JBL speakers and Crown amps..for Yorkville Speakers use the VTC DLMS4080 Speaker processor, it blows the Drive PA away...

May 05, 2010 | DBX DriveRack 480 Processing Unit Home...

1 Answer

Sent Messages are stuck in Outbox and many copies are sent


You may have removed some items from your sent box as you are saying but it still may reflect a size larger than its capacity.

Go to tools-options-maintenance-store folder: Copy the location in there and place it into your "run". this will open up the folder for the .DBX files. If "Sent Items.dbx" is larger than 2G there is your issue, you have no more space to hold sent items, hence it is going out but not moving to the "sent" box.

Apr 23, 2009 | DBX -215 Home Equalizer

1 Answer

System speaker


Hello Sir,

Check this site for audio drivers. http://www.realtek.com.tw/downloads/

It will be useful. Check out..

Don't forget to comment

good luck

Nov 08, 2007 | DBX DriveRack 480 Processing Unit Home...

4 Answers

DBX 119


Do you mean you are just going to play back dbx-encode tapes that have already been recorded? Or both playback and record new material? Please explain.

Aug 25, 2007 | DBX 1231 Home Equalizer

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