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From what I have read about this EQ it is just for subsonic frequencies. You really don't want to run your components through this EQ. Leave the components running off of the 4 channel amp and your sub box on the two channel with the EQ in series between your head unit and the sub amp.
If the same channel is dead on the EQ as is dead on the amp there may be a correlation.
Let's break this into its two parts.
1) SU-Z550: You don't say WHAT source(s) you tried to use on the CD/AUX, TUner and PHONO inputs. The external device itself could be the source of the low volume. Try swapping the Left and Right cables to see if it follows the source channel or stays with the amplifier channel.
Check the controls on the amp to make sure you understand each one's effect on the sound.
"PHONO" is literal and exclusively FOR A TURNTABLE - NOTHING ELSE - EVER.
2) SH-8055: Equalizers don't 'boost' sound, they modify its levels at various frequencies. To do that they should be connected into a Tape loop on your amp. OUTs go to IN's. Then you select the Tape Loop on the amp and that inserts the EQ into the signal path of whatever source you're listening to. It's actions are BEFORE any other amplifier controls such as volume, tone and balance. The EQ itself also has a Tape Loop to replace the one it occupies. Make sure it is not enabled unless you have a Tape Deck on it to use. Choose "SOURCE". The blue LED display is to show you frequencies are present in the program material.
Set all of its lighted band controls at midpoint prior to declaring it defective. EQ is like any spice - a little is good, a lot ruins the recipe.
The "Front output" from the Pioneer deck would connect to the "Main In" on the Clarion EQ. I'm assuming that your Clarion EQ can only deal with one input, and will send the adjusted (equalized) signal out both of the outputs. The "Front output" from the Clarion EQ should go to the "Front Input" on the 4 channel amp. The "Rear output" from the Clarion EQ should go to the "Rear Input" on the 4 channel amp. The "Sub output" from the Pioneer deck would connect to the Left/Right Input on the Epicenter. The Left/Right Output on the Epicenter would need a Y-splitter for each side, so that you could connect each amp separately. One suggestion would be to use one sub amp for both subs.
Make sure your channel is assigned to "main mix" (bottom button to right of main volume slider).
Make sure your main output slider has volume applied.
Make sure the cable you're plugging into your "main output" is being plugged into the 1/4" or xlr output receptacle that corresponds with the slider you provided volume to.
You should then put the outgoing cable into either an eq or an amp.
If you're going to an amp first, place the cable carrying the signal from the board into an "incoming" slot on the amp. Run a cable from the output of that channel of the amp to a speaker. Turn on the amp and fade the volume knobs up. That should give you power - provided your board, cables, amp and speaker are working properly.
If you're going to an EQ first, place the cable carrying the signal fromt he board into an "incoming" slot on the eq. Then run a cable from the output of the same channel on the eq to an incoming slot on your amp. Then run an outgoing cable from the same channel on the amp to a speaker. Flip your eq on, flip your amp on, fade up the volume on the amp, and make sure you don't have a gate closed on the eq (also make sure if you have a gain knob on the eq, that it's at least partially providing power). If your board, cables, eq, amp and speaker are working properly, you will have sound.
I suspect you may be right about the eq here, though you probably have had it sorted by now.
I came across this thread because I was searching for a fix to my R-231 and was hoping you might be able to help me if you found a fix. I'm persisting with this one as I can't really get another just now and it seems that it's not a major issue. I managed to get a good signal out of it when I ran it without the ground connected on output???
Anyway, any info I would greatly appreciate,
Not knowing what you have the SPL-620 driving or knowing how you have it wired, it's rather difficult to determine if it's wired "wrong".
I show the SPL DK2-620 as being a 2-channel amp with 150 watts output at 4 ohms, or 180 watts at 2 ohms. Even if the power is somewhat overrated, it should provide more than enough power for a set of standard 2-way or 3-way speakers, or component speakers with a separate crossover.
Powering one or more subs is another thing. You would get sound, but the subs would not be very loud. In bridged mode, the amp is only stable to 4 ohms. So if you are trying to power 2 4-ohm subs, the best connection would be 1 sub connected to each channel. If you are powering only 1 sub, then the bridged connection would be best.
Hope this helps. If it does, please rate as "FixYa".
The 230 watt amp is a little small for your subs. They'll work, but if you are looking for max SPL, you won't get it. To push those Audiobahn's to their potential pavement shaking max, I would recommend an amp in the range of 500-600 rms (2-channel bridged) or 1000 watts rms monoblock.
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.