Official SpeakerPower amplifier thread - Page 8 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 84Likes
Reply
 
Thread Tools
post #211 of 221 Old 01-24-2017, 07:22 PM
AVS Forum Special Member
 
notnyt's Avatar
 
Join Date: Dec 2008
Location: Long Island, NY
Posts: 8,115
Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 2312 Post(s)
Liked: 2121
Quote:
Originally Posted by chrapladm View Post
Well that would be good even if I could just ask for him to put one in. I will probably try a cheap plate amp on my clone JBL speaker and it will be Hpassed around 40hz all the time. If need be I can use an external device to hpass but having this already done would be nice. Would also be nice if the smaller plate amps had the option of a slave out. I will be also using my clone speaker as a bass guitar cabinet. Being able to add in another 18" below that would be great while still using the plate amp.

Either way look forward to getting Brian's plate amps in my builds.
While it's nice to have, it's not something you can adjust if you repurpose the amp
notnyt is offline  
Sponsored Links
Advertisement
 
post #212 of 221 Old 01-24-2017, 07:28 PM
AVS Forum Special Member
 
chrapladm's Avatar
 
Join Date: Mar 2010
Location: Adelaide, South Australia
Posts: 4,293
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 856 Post(s)
Liked: 294
Quote:
Originally Posted by notnyt View Post
While it's nice to have, it's not something you can adjust if you repurpose the amp
True. Not get out of here with your logic and good advice. Maybe just the salve out option on the smaller plate amps then.
chrapladm is online now  
post #213 of 221 Old 02-02-2017, 05:45 PM
AVS Forum Special Member
 
baniels's Avatar
 
Join Date: Oct 2006
Location: SE Iowa
Posts: 1,393
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
Liked: 345
I've had my mic out the last few days. Today I wanted to see exactly what the LF Adjust dial did on my SP1-4000-HTs.

These were close mic sweeps - a few inches from the cone of one of my HS24 MKIIs.

Here's one graph... 10hz-200hz. Trust that 0-10hz follows the same slope.



Here is a zoom in. Now, since the knob has 10 settings, going from CUT to BOOST, the closest to defeating it altogether is either detent #5 or #6.



The blue and yellow lines in the middle are 5 and 6, which at 20hz are 89.5db and 93db respectively. That amount to just over twice the power at that frequency. I did most of my other measurements on detent 5, but after looking at this, I wonder if I was cutting there.

Any thoughts? It's not a huge deal, as I think I have headroom for fudging, but as I experiment with EQ and gain in an attempt to just kiss the limits of the system, a 3db boost at 20hz should be part of the equation.
lukeamdman likes this.
baniels is offline  
 
post #214 of 221 Old 02-18-2017, 08:27 PM
AVS Forum Special Member
 
raynist's Avatar
 
Join Date: Dec 2002
Location: PA
Posts: 3,520
Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 1413 Post(s)
Liked: 1350
Does anyone know what the input sensitivity is on the SP1-4000? What voltage will drive it to full power?
raynist is online now  
post #215 of 221 Old 02-18-2017, 08:46 PM
AVS Forum Special Member
 
notnyt's Avatar
 
Join Date: Dec 2008
Location: Long Island, NY
Posts: 8,115
Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 2312 Post(s)
Liked: 2121
Quote:
Originally Posted by raynist View Post
Does anyone know what the input sensitivity is on the SP1-4000? What voltage will drive it to full power?
If only there was a place that this data was all posted

http://www.speakerpower.net/specifications1.html

gain: 45db
input sens: 316mV
notnyt is offline  
post #216 of 221 Old 02-18-2017, 08:58 PM
AVS Forum Special Member
 
raynist's Avatar
 
Join Date: Dec 2002
Location: PA
Posts: 3,520
Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 1413 Post(s)
Liked: 1350
Quote:
Originally Posted by notnyt View Post
If only there was a place that this data was all posted

http://www.speakerpower.net/specifications1.html

gain: 45db
input sens: 316mV
Thanks! I did originally look there and thought maybe it was a misprint as the rack amps say 2.0v

So that means 0.316 volts will take this to full power?
raynist is online now  
post #217 of 221 Old 02-18-2017, 09:25 PM
AVS Forum Special Member
 
notnyt's Avatar
 
Join Date: Dec 2008
Location: Long Island, NY
Posts: 8,115
Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 2312 Post(s)
Liked: 2121
Quote:
Originally Posted by raynist View Post
Thanks! I did originally look there and thought maybe it was a misprint as the rack amps say 2.0v

So that means 0.316 volts will take this to full power?
pro gear generally runs at higher voltage levels than consumer gear.

Also, I think you mean max voltage. Power will depend on the load.

Anyway, a gain of 45dB will give you approximately 178 times the output voltage. So, 0.316v * 178 = 56v. 56v into a 2 ohm load gets you about 1568 watts. You'll need about 89.5v to get 4kw into 2 ohms. Half a volt input will get you to 89v output.

These levels are trivial for almost all devices to reach. In fact, it might even be too sensitive, but there's a gain knob, so you don't need to worry about that.
baniels likes this.
notnyt is offline  
post #218 of 221 Old 02-18-2017, 09:52 PM
AVS Forum Special Member
 
raynist's Avatar
 
Join Date: Dec 2002
Location: PA
Posts: 3,520
Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 1413 Post(s)
Liked: 1350
Thanks Notnyt!

I want to make sure in not limiting my JTR S2's. I set their gains to max. I have a mini DSP Balanced that I am using to adjust the sub gain. Right now in my Onkyo 5509 the subs are set at -10. I have the minidsp output around -20 and the speakerpower amps in my JTR S2's set to max.

My goal was to be able to keep the S2's setting at max as there are occasionally wandering hands in my gameroom. This way they can only be turned down.

I am thinking I should be able to measure the output of the MiniDSP Balanced with a voltmeter to see what the max output is with my current settings.
raynist is online now  
post #219 of 221 Old 03-10-2017, 07:23 PM
Senior Member
 
johnplayerson's Avatar
 
Join Date: Feb 2008
Location: Canada
Posts: 488
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 145 Post(s)
Liked: 53
Quote:
Originally Posted by lukeamdman View Post
Each SP2-12000 has it's own dedicated 240v 30A circuit, so that's 180A worth of breakers just for those 3 amps!

Nice yes.

And this is the real way to get the power out a line.............
1 move to 240 vac
2 make the breaker 20 to 30 amp
3 have a dedicated line for each amp.

Good work. This makes more sense

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
johnplayerson is offline  
post #220 of 221 Old Today, 09:00 PM
AVS Forum Special Member
 
blazar's Avatar
 
Join Date: Oct 2004
Location: USA
Posts: 3,505
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 719 Post(s)
Liked: 528
can someone comment on fan noise with speakerpower amps? Do the newest amps now have 12 volt triggers or do you still have to have an outboard solution?

Blazar!
blazar is online now  
post #221 of 221 Old Today, 09:51 PM
AVS Forum Special Member
 
notnyt's Avatar
 
Join Date: Dec 2008
Location: Long Island, NY
Posts: 8,115
Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 2312 Post(s)
Liked: 2121
Quote:
Originally Posted by blazar View Post
can someone comment on fan noise with speakerpower amps? Do the newest amps now have 12 volt triggers or do you still have to have an outboard solution?
There is no fan noise

I've yet to have the fans even turn on in my amps.
notnyt is offline  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off