Tech Square Technical and speculative discussion of amps, cables and other topics.

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tech Square ]

---

[ Alert Moderator ]

---

Basics for the newbie

Posted by Punkuk (A) on November 20, 2008 at 06:53:23

In Reply to: Impossible without adding wasteful resistors posted by clifff on November 20, 2008 at 05:12:07:

It is for an array of transducers in a HT environment,
(I could not afford 5 Clark TST429s @ over $400 each so I opted for a bunch or bass shakers from Fleabay and Craigslist)

I am using a MPA 250 amp that in a bridged mode the specs say to use an 8ohm load, I plan on using 3 shakers per channel with each channel in a mono bridge mode.

If wire the speakers in series I will arrive at a 12 Ohm load for each channel, how will that affect the output of the amp and as the amp does not show a spec for a 12 ohm load I was unsure if it would be OK.

Or can I use 4 25w speakers on one channel = 12 Ohms and Two 50w on the other = 8 Ohms. (I have 4 Shakers @ 25w each and the other two are 50w each), would this be a better configeration than 2 @ 25w + 1 @ 50w to each chanel?

From the manual:
“You can connect one or more 4-, 8-, or 16-ohm speakers to the amplifier. You can also bridge the amplifier’s channels.
The amplifier has two channels: A and B. If you connect two pairs of speakers, follow these guidelines:

• Speakers connected to the same channel
(A or B) are part of a pair and must
be of the same impedance.

• Speakers connected to different channels
(A or B) are not part of a pair and
can be different impedances”.

In addition how is the amps ability to perform affected by adding more speakers each at 25/50w wired in series and or parallel and arriving at impedance level that the amp can handle.

Input Impedance: ............................. 20 kOhms
Continuous Output Power:
Stereo at 1 kHz: ...................... 125 Watts x 2 (8 Ohms)
Stereo at 1 kHz: ...................... 175 Watts x 2 (4 Ohms)
Bridged at 20 Hz to 20 kHz: ........... 250 Watts (8 Ohms)
Bridged at 1 kHz: ..................... 350 Watts (8 Ohms)

Total Harmonic Distortion: .................... 0.1% at 80 Watts
Frequency Response (10 Hz - 50 kHz): .......... +/- 3 dB
Input Sensitivity: ............................. 0.775 V
Signal-to-Noise Ratio: ........................ 90 dB (A-weighted)
Speaker Impedance: ............................ A, B (4-16 Ohms)
A + B (8-16 Ohms)
Bridged (8-16 Ohms)

Hope you have the patience to read and understand what I am trying to accomplish here, basically get the most bang for the buck from the Bass Shakers by wiring them to optimize the amps output

Life Can Be Crule

• Specs   (Open in New Window)

Edits: 11/20/08 11/20/08

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---