Monoprice 50w Hybrid Amp

24

Comments

  • mhardy6647mhardy6647 Posts: 18,018
    Nope, not weird at all :) I couldn't tell what the cabinets were from the photo; at the size Vanilla reproduced your image, they look nice!

    I didn't click to see it at higher resolution.

    The horns are classy.
    Sorry to go all Lt. Columbo on you, but what drivers do the horns have on them?
    Is there a thread elsewhere on the loudspeakers?

    I'll stop now, I promise! :p

    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • rooftop59rooftop59 Posts: 4,280
    The speakers look really cool from a distance, but zooming in I see why you’d want to finish them. I agree about mdf. If they were Baltic birch or something like that I would say poly and be done.

    Did you build the crossovers or does parts express have a kit?
    HT Rig:
    Denon AVR-X4200w; Parasound HCA-1205A; Arcam rDac; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Def Tech Procenter 1000; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; Sony BDP-S390, FireTV gen 2

    Master Bedroom
    Marantz SR-5007; Audiosource Amp Two, PSB Imagine Mini, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, FireTV, Arcam rDac; Bryson BPD-1
  • zingozingo Audiophile Posts: 11,610
    I did build the crossovers using modeling software with a few different version. The sound quality and frequency response I have now is amazing, except I think the absolute phase is slightly off which I need to trouble shoot.

    The tweeters are Vifa XT25TG30-04 and the waveguide profile was taken from Zaph Audio website. Enclosures were scaled similarly to PMC twenty series.

    607511d1490399146-fs-waveguide-tm-speakers-img_0119.jpg

    618413d1495898638-waveguide-transmission-line-monitors-img_6689-jpg

    618414d1495899031-waveguide-transmission-line-monitors-image-png
  • mhardy6647mhardy6647 Posts: 18,018
    I hate busted links, so I borrowed the images ;)

    3io4v5gjgia3.png
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    9q4r5jnbwyhl.png
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • zingozingo Audiophile Posts: 11,610
    edited July 2
    I just ordered some NOS Russian 6P1P tubes to swap into the amp to test. I’m going to grab a pair of same area 6N1P tubes also, but I’ll be interested to test them separately for effect on the sound quality.

    There isn’t a ton of tube rolling that can happen with this amp, but I have historically liked NOS Russian military tubes, and it will also minimize my expenses.

    so0l7e7d0rwp.jpeg
  • mhardy6647mhardy6647 Posts: 18,018
    edited July 2
    Cool.

    I have been generally pleased with the military Russian/Soviet tubes as well (and FWIW, of course!)... still wondering whether 6922 and (???) even EL84 (as opposed to EL86/6CA5) might be close enough subs for the original tubes -- and I am still wondering what, if anything, those power pentodes are doin' in the circuit of these amps?!

    No, I haven't gone under the decks of the 25 watt morph here & tried to trace out the circuit -- yet. :|
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • verbverb Posts: 2,689
    Here we go again! :smile:
    s82emt3z44go.png
    Basement: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
    Spare Room: Dayens Ampino Integrated, Auris BluMe, Polk TSi200's
    Living Room: Pioneer SX-N30 Network Receiver, Pioneer PD10AE CD Player, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi Subwoofer
  • mhardy6647mhardy6647 Posts: 18,018
    @Zingo'll take out the PNW; I've got the NE.

    :#
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • ConradiclesConradicles Posts: 5,723
    zingo wrote: »
    Cons-
    -Bass shy (I don't know if that a design issue, or the limited power)

    I just got mine hooked up and my initial impressions are exactly what you stated here. Going to give it a couple weeks in the office rig and decide if it is a keeper.

  • DSkipDSkip Posts: 14,581
    Limited power still produces bass. The fact that there is none represents the 'value' of the amplifier.
    audiothesis.com/

    Speakers: Harbeth: 30.2, SHL5+; Usher: Be-10, T-515; Rosso Fiorentino: Elba, Pienza, Certaldo, Fiesole, Volterra; Polk: T50, Signature S15, RTA 15tl, RTi12; Sonner Audio Allegro Unum, Legato Unum, Legato Semis, Legato Duo; Emerald Physics CS-2.8; Klipsch KLF-20
    Preamps: Shuguang S200MK, Dayens Ampino, Parasound P5
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    Cabling: Wireworld
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  • ConradiclesConradicles Posts: 5,723
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.
  • mhardy6647mhardy6647 Posts: 18,018
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.

    Hmm...

    How bad would it have to sound to be a bargain at, say, $79.95?

    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • txcoastal1txcoastal1 Posts: 9,670
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.

    Are you running it crossed with a sub like Zingo?
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC
  • zingozingo Audiophile Posts: 11,610
    It’s true that 18” and 2000w of Christie Digital does round out the bottom frequencies when testing ANY amplifier. :)
  • delkaldelkal Posts: 229
    edited July 2
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.

    The picture shows this amp has base and treble controls (if they work). I know true audiophiles are not supposed to use them but did you try any adjusting?
  • zingozingo Audiophile Posts: 11,610
    Pushing the bass a little via tone controls does seem to fill out the bottom (when not using a subwoofer) without changing the sound quality much.
  • mark090852mark090852 Posts: 719
    delkal wrote: »
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.

    The picture shows this amp has base and treble controls (if they work). I know true audiophiles are not supposed to use them but did you try any adjusting?

    I was listening to mine last night, and adjusted the tone controls slightly. I raised the treble just a little bit, and raised the bass just slightly less. Improved the SQ enough that we can enjoy it in a little living room set up. Well worth the cost to me if it continues to work. Time will tell. Plus, my wife surprised me and stated she likes the looks of it A LOT! That right there is worth the price of admission!

    r51pimmmumg8.jpg
    Yamaha Aventage RX-A840 receiver, Emotiva XPA Gen3 2 channel amp, Polk LSiM 703 speakers.
    Oppo UDP-203 Blu-Ray player.
  • rooftop59rooftop59 Posts: 4,280
    Does it sound like a tube amp?
    HT Rig:
    Denon AVR-X4200w; Parasound HCA-1205A; Arcam rDac; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Def Tech Procenter 1000; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; Sony BDP-S390, FireTV gen 2

    Master Bedroom
    Marantz SR-5007; Audiosource Amp Two, PSB Imagine Mini, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, FireTV, Arcam rDac; Bryson BPD-1
  • mark090852mark090852 Posts: 719
    edited July 3
    rooftop59 wrote: »
    Does it sound like a tube amp?

    Well, I'm sure it doesn't sound like a "good" tube amp. I haven't listened to a tube amp before, so I wouldn't be able to tell you if it has any kind of a "tube" sound to it at all.
    Yamaha Aventage RX-A840 receiver, Emotiva XPA Gen3 2 channel amp, Polk LSiM 703 speakers.
    Oppo UDP-203 Blu-Ray player.
  • zingozingo Audiophile Posts: 11,610
    It does not sound like a tube amp. I've been told the power comes from an LM chip (which I'll open it up to find out), which if implemented properly can sound good in class A/B. Aside from the cheap Chinese tubes, it does have a good build quality and sound quality if you are looking for a good chip amp. I'm probably going to swap some parts in it to see where I can get the sound quality, but you are not buying a tube amp; or have the maintenance of a tube amp.
  • ConradiclesConradicles Posts: 5,723
    txcoastal1 wrote: »
    Are you running it crossed with a sub like Zingo?

    No, no subwoofer.

  • ConradiclesConradicles Posts: 5,723
    delkal wrote: »
    Seems like the mids and highs totally overpower the bass. Still, for $127 this was a bargain.

    The picture shows this amp has base and treble controls (if they work). I know true audiophiles are not supposed to use them but did you try any adjusting?

    Yes, did not like the results.
  • ConradiclesConradicles Posts: 5,723
    @zingo , mine is very noisy. Like when you turn it on, after about 5 or 6 seconds, I get some pretty audible distortion coming thru the speakers. Yours do that?
  • zingozingo Audiophile Posts: 11,610
    tpvvpxdh1gt6.jpeg

    I just grabbed a pair of these NOS Russian 6N1P-EV tubes and I’ll test these separately from the other pair once they are delivered.
  • zingozingo Audiophile Posts: 11,610
    @zingo , mine is very noisy. Like when you turn it on, after about 5 or 6 seconds, I get some pretty audible distortion coming thru the speakers. Yours do that?

    No but I have heard that complaint with the 25w version. I always have the volume off when I turn on any system, but I paired my phone to the Bluetooth, turned the pot all the way up without anything playing, and only heard faint electrical noise; which I would expect in that situation.

    I even tried having the system on and keying my HAM radio, and the amp didn’t seem to pick up any noise there.
  • zingozingo Audiophile Posts: 11,610
    I received both sets of tubes so I will put a little time on them and test them verses the Chinese tubes.

    I also just picked up a local minty pair of Monoprice K-BAS speakers which I think are very interesting; a hybrid transmission line cabinet design for improved bass response. I'm also going to test these with the hybrid amp and listen to a Monoprice system.

    5.25" Polypropylene + Mica Cone Woofer
    1" Liquid-Cooled Titanium Dome Tweeter
    39Hz-20kHz ±2.2db Frequency Response
    8 Ohms Impedance
    87dB Sensitivity

    lnfja7umoxac.jpg
  • mhardy6647mhardy6647 Posts: 18,018
    For the record (so to speak) and FWIW, I am listening to the fairly new, remastered and "completist" release of Pete Townshend's first solo album/project, Who Came First on redbook CD, via the "25 watt" Monoprice hybrid amp morph on the Frankenaltecs.

    I finally kinda got the hang of the wonky tone controls and got them to some semblance of flat (i.e., relative to the SE 2A3 ampliifer's sound) response... and things are not sounding too bad.

    Gonna play with the tubes in this one, too, soon -- even though I am not at all convinced that they're actually doing anything but boiling electrons off of their cathodes and dissipating some power as heat from their plates. :|
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • mlistens03mlistens03 Posts: 1,213
    edited July 13
    mhardy6647 wrote: »
    on the Frankenaltecs.

    Seems like a lot of risk involved there... ya know, with the bomb Monoprice.
    2 channel
    Speakers: Mission 770 Freedoms
    Integrated amp: Technics SU-v75 and matching tuner
    CDP: Technics SL-PC20
    Cables: Monoprice, Monster, Acoustic Research, and a few generic ones
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    Cartridge: Shure M97xE

    Pc gaming setup
    Receiver/amp: Yamaha RX-V665
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    Interconnects: Amazon basics HDMI, Acoustic Research HDMI, Monoprice speaker cables
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    Random equipment on standby:
    Onkyo TX-v940, JBL woofers and tweeters, single Klipsch KG .5, Yamaha guitar amplifier, Peavey Rage 158 guitar amplifier, Kicker comp 12” subwoofer, single Bose 802 series II, a whole bunch of 1”-3” full range drivers, Infinity Crescendo 3007s (on sale), Polk LSi25s
    txcoastal1 wrote: »

    You don't tell her you read the manual, and you tell her you know what the problem is, and you fixed it, because that what men do, fix things
    sure it has a flat response, and sure it has a lot of detail, and yes, it has good and clear lows. But is it enjoyable to listen to? Does it make you grin ear to ear? That’s what really matters.
    Seen somewhere on AudioKarma (I think)
  • zingozingo Audiophile Posts: 11,610
    Initial impressions of the Russian tubes over the Chinese tubes is a more full sounds and a bit more bass. Next step will be to take apart the amp and see the inner gutty works.
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