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The Acoustic Club

#1,003
The Rig of Doom lives!

I rented a Yorkville AP4020 amp (wanted a 2020 but they were all out).

A friend dropped by tonight and we set it all up. Yowzer! That Bag End 2x10 and 18 together rock the house.

We plugged into the Effects Send using a 1/4" Mono 6ft Y cable, with the single input into the back of the Acoustic amp, the dual inputs into the AP4020 power amp.

Powered up the Acoustic first (volume off), then the amp. Used Speakons for the 2 cabs. Turned the power amp volume on both channels to 50%, then slowly cranked up the Acoustic volume.

Serious nice, round tone. We turned off channel B (1x18 cab), and the 2x10 sounds good, solid, but I didn't realize it was missing the lows so much until I put the 1x18 back in. With both running there is a full deep tone out of the bass.

We tried the Sansamp, but I didn't like any of the settings we used. The Acoustic provides such a great range of tones that I prefer using that through the power amp.

So the operation was successful. I'm in the process of getting a full time power amp soon and really enjoying this rig...:D
 
#1,006
stingray69 said:
Never heard that one when it comes to SS amps. :eyebrow: Maybe Acoustic's tech support could shed some light...
Click to expand...


Yeah I hope they chime in here. In the 80's I had a Peavey CS400 Transistor Power Amp. Every time you turned it on without speakers plugged in it would blow. Can't remember what it blew out but they were about $8 a piece and a pain to replace. Peavey fortunately fixed that problem and since you can run their amps without a speaker plugged in. As long as it is not a tube amp. I think Acoustic should be ok but would love to hear what they have to say.
 
#1,007
wildhorse said:
Yeah I hope they chime in here. In the 80's I had a Peavey CS400 Transistor Power Amp. Every time you turned it on without speakers plugged in it would blow. Can't remember what it blew out but they were about $8 a piece and a pain to replace. Peavey fortunately fixed that problem and since you can run their amps without a speaker plugged in. As long as it is not a tube amp. I think Acoustic should be ok but would love to hear what they have to say.
Click to expand...

Well I emailed them a few weeks ago with some questions, and recently with other questions. No response to date.

From what I've heard it's death for a tube amp not to be plugged into a speaker, but it's no problem for solid state amps.
 
#1,012
A couple of days ago I put out a feeler to see what opinions you all had about my bass combo working poorly.Well,I got it back from the tech and it works and sounds great!The initial problem that I had was that after a couple of minutes the speaker would distort and the amp would exhibit a power loss.The problem was a main filter cap needed a connection repaired as well as the power transformer needed to be reattached.For a thirty plus year old amp as well as it being a 50 watter,it sounds cool imo.My tech is Craig Simon from British Amp Service out of NJ.Dave D
 
#1,017
the_hook said:
Well I emailed them a few weeks ago with some questions, and recently with other questions. No response to date.

From what I've heard it's death for a tube amp not to be plugged into a speaker, but it's no problem for solid state amps.
Click to expand...

You are correct. A tube amp must see a load if there is an input signal, however SS amps generally do not. The output power on a SS amp is impedance sensitive.

This means that a dead short will damage the amp, but the SS amp will vary it's output power based on the load. No load, no output power, no problem.

I left GC (and hence Acoustic) about a month ago. There are great folks there that care about what is going on, so sure they will answer your questions.

Patrick
 
#1,018
Stacknobuser said:
You are correct. A tube amp must see a load if there is an input signal, however SS amps generally do not. The output power on a SS amp is impedance sensitive.

This means that a dead short will damage the amp, but the SS amp will vary it's output power based on the load. No load, no output power, no problem.

I left GC (and hence Acoustic) about a month ago. There are great folks there that care about what is going on, so sure they will answer your questions.

Patrick
Click to expand...

Sorry to hear you left Patrick. Your inside take on things was a great assett to the group. Where you working now?
 
#1,019
Here's the final setup for my bass rig;

Acoustic B200H head using Effects Send into
a Yamaha P2500S dual channel power amp
Channel A into a Bag End D10X-D (2x10) cab @ 4 ohms
Channel B into a Bag End S18E-D (1x18) cab @ 8 ohms

Few things to point out; the B200H would emit (what I thought was) a typical 'amp hum' through the 2x10 I was using before this new rig setup. The Yamaha is whisper quiet and, with the B200H doing only the tone and volume chores, there is literally no more hum or noise.

The sound out of the amp and cabs now is very clean. The more volume I use the better it sounds. The B200H into the 2x10 was loud, but it was not as clean sounding as the current setup.

What is good about this setup is that the 200w or 4 ohm limits don't have to hold you back. You can still use the amp to work as a pre-amp. The only reason I ended up with this rig is I bought everything used and the BE cabs came at such a great low price that I wanted to see if I could get everything to work together.
 

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