Help identifying Realistic speaker and amp

[JesseIn.Tents]

Hey guys,

I've found this speaker and amp combo on gumtree. Both realistic, is this a decent first loudspeaker, using for fast bass heavy music? He's asking $50

It's a realistic mpa 30 amp, help identifying speaker would be handy

Thanks for any help

 

[WaynePflughaupt]

Guess you didn’t notice, this is a forum for home theater enthusiasts. I’m sure there’s a forum out there somewhere for fans of vintage low-end PA equipment. Regardless, as long as it works you have your $50’s worth but no you won't be getting any "heavy bass" from it.

Regards,
Wayne A. Pflughaupt

 

[BoredSysAdmin]

Might be worth checking with folks on AudioKarma forums - they seems to like vintage audio stuff, but Wayne is right - Realistic brand and their owner - Radioshack, never really produced anything amazing

 

[TLS Guy]

What are you planning to use this for? It is no good for home audio. That is a mono PA amp and some type of instrument speaker. I have no idea if it is lead or bass guitar. I'm not even sure that the amp is the right one for the speaker. It looks to me like a mic amp and not a guitar amp.

 

[lovinthehd]

The MPA-30 amp is a 20 watt PA amp per Realistic, here's the specs:

MPA-30 (320-2034) Specifications Facback Doc. # 8735

Output Power at 4 ohms 1 kHz, 10% THD...........................20 watts
Power Bandwidth at 5W, 10% THD, Aux Input......................40Hz-45kHz
T.H.D. at 10W, 1kkHz with 30kHz Low Pass Filter
MIC.1..........................................................0.22%
MIC 2..........................................................0.22%
AUX............................................................0.38%
PHONO..........................................................0.36%
Input Sensitivdity at 10% THD, 1kHz
MIC 1..........................................................2.5mV
MIC 2..........................................................2.5mV
AUX............................................................150mV
PHONO..........................................................2.4mV
Signal-to-Noise Ratio (Input Shorted)
with 30kHz Low Pass Filter
MIC 1...........................................................65dB
MIC 2...........................................................65dB
AUX.............................................................67dB
PHONO...........................................................64dB

Frequency Response at 4 ohms +/-3dB
Mic 1.....................................................90Hz-15kHz
Mic 2.....................................................90Hz-15kHz
AUX..................................................... .90Hz-15kHz
Tone Control (High Cut at 10kHz)....................................-15dB
Hum and Noise at 4 ohms with 30kHz Low Pass Filter
at Master Volume Min...........................................1.2mV
at Master Volume Max and Other Min..............................12mV
Power Requirement............................................AC 120V 60Hz
...................................................................DC 12V
Dimensions (HxWxD)..............................3 x 11 1/2 x 7 3/4 Inches
Weight............................................................7.7 Lbs

 

[Dennis Murphy]

The MPA-30 amp is a 20 watt PA amp per Realistic, here's the specs:

MPA-30 (320-2034) Specifications Facback Doc. # 8735

Output Power at 4 ohms 1 kHz, 10% THD...........................20 watts
Power Bandwidth at 5W, 10% THD, Aux Input......................40Hz-45kHz
T.H.D. at 10W, 1kkHz with 30kHz Low Pass Filter
MIC.1..........................................................0.22%
MIC 2..........................................................0.22%
AUX............................................................0.38%
PHONO..........................................................0.36%
Input Sensitivdity at 10% THD, 1kHz
MIC 1..........................................................2.5mV
MIC 2..........................................................2.5mV
AUX............................................................150mV
PHONO..........................................................2.4mV
Signal-to-Noise Ratio (Input Shorted)
with 30kHz Low Pass Filter
MIC 1...........................................................65dB
MIC 2...........................................................65dB
AUX.............................................................67dB
PHONO...........................................................64dB

Frequency Response at 4 ohms +/-3dB
Mic 1.....................................................90Hz-15kHz
Mic 2.....................................................90Hz-15kHz
AUX..................................................... .90Hz-15kHz
Tone Control (High Cut at 10kHz)....................................-15dB
Hum and Noise at 4 ohms with 30kHz Low Pass Filter
at Master Volume Min...........................................1.2mV
at Master Volume Max and Other Min..............................12mV
Power Requirement............................................AC 120V 60Hz
...................................................................DC 12V
Dimensions (HxWxD)..............................3 x 11 1/2 x 7 3/4 Inches
Weight............................................................7.7 Lbs

Whoa--20 watts, but only at 1 kHz, into 4 ohms, and with 10% distortion. We're probably talking 5 watts max over the entire bandwidth at listenable distortion levels into 8 ohms. I guess some things are getting better.

 

[JesseIn.Tents]

Cheers guys, picked it up for $40. Really just wanted a loudspeaker and amp combo to make some noise. After listening to the combo it's obvious the amp is way underpowered for the speaker. I'm planning on building my own 70 watt RMS amp to use with the speaker.

Definitely did get my $40 worth of "vintage low-end PA equipment" but what is $40 when I can annoy the vegan bakery that I live next door to, hey?

Thanks SysAdmin, will check it out!

Dennis, turns out the speaker requires 8 ohms, so it is getting nowhere near enough power. Only just starting to learn technical speak for audio equipment. Will definitely be more equipped when I am looking to upgrade.

Thanks all for the replies, despite being on the wrong forum. I will make sure to check the small print next time, and not post to a forum dedicated to "pursuing the truth in audio and video".

Have a nice time.

 

[lovinthehd]

I don't know, maybe this is the guy who someone with some serious audio gear should be annoying. What did the bakery do to you @jesseln.Tents? (and who cares if they're vegan? It's a fucking bakery.....last thing I expect in a bakery is meat products). Just sayin'....and I'm far from being a vegan.

 

[BoredSysAdmin]

I don't know, maybe this is the guy who someone with some serious audio gear should be annoying. What did the bakery do to you @jesseln.Tents? (and who cares if they're vegan? It's a fucking bakery.....last thing I expect in a bakery is meat products). Just sayin'....and I'm far from being a vegan.