Amp Internals 2 |
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michel29
Registered User Joined: 04 November 2014 Location: france brittany Status: Offline Points: 55 |
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transformer ? i prefer re-use transformers from mini-HiFi components better construction better primary/secondary insulation not toroïd > better mains'noise attenuation i've fixed a Cambrige amplifier with a transformer from a Philips Mini HiFi system on Cambride , the worst toroïd , made in china by childrens ? il was dead , short-circuit in primary on Philis a good Tam-radio E-I transformer fitted with good magnetic shield Edited by michel29 - 18 September 2018 at 10:14pm |
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Jakeeboy64
New Member Joined: 31 October 2011 Status: Offline Points: 9 |
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Don't suppose anyone has a circuit diagram for the PSL 2401? I have 2 of them and 3 out of 4 channels have a little too much DC offset. Thanks Edited by Jakeeboy64 - 13 November 2018 at 11:43pm |
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user91
New Member Joined: 14 July 2013 Status: Offline Points: 5 |
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Irni L FPX 3000 / Made in Bulgaria 2 х 2100W / 2 ohms, 2 х 1500W / 4 ohms, 2 х 900W / 8 ohms Uniqaudio PA 1800 / Made in Bulgaria 2 х 900W / 2 ohms, 2 х 800W / 4 ohms, 2 х 450W / 8 ohms Edited by user91 - 23 January 2019 at 9:30pm |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Bose entero 4400
4 x 400W/8ohm 2 x 900W/8ohm (I measured 2 x 903Watts rms @ 40Hz). I don't recommend 4ohm bridge load, this amp is happy with 4 x 4ohm or 2 x 8ohm. Very sweet sounding and flawless amp. Almost silent at idle, no fan noise at all and they are responding really fast for increasing or decreasing loads. This amp really does what they claim in product manual. |
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4AC
Young Croc Joined: 18 September 2010 Location: Netherlands Status: Offline Points: 521 |
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I think this Bose Entero is a rebadged version of the Bittner 4X DUAL Series, maybe slightly modified:
I had two Entero 4400's once, both with failures. My repair guy said that they were beyond economical repair. Not that this says anything about the reliability of these amps... Edited by 4AC - 28 January 2019 at 10:28am |
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uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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stanley dj
Registered User Joined: 19 July 2013 Location: Ireland Status: Offline Points: 154 |
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it is bittner is making amps for more brands
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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I'm suprised they even bothered with descrete components in this,a chip-amp would have produced 2x45w no problem. |
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Be seeing you.
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mini-mad
Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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You COULD of had a pair of clone 405 amps in there for a minimum of DOUBLE the output...
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If it sounds like a gorilla is trying to escape, turn it down.
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Carlsbro powerline pro 2000
Compared to Tamp TA1400, look at the difference. Output power? Measured almost the same! Carlsbro has rail voltage of 2x110V (class ab), Tamp 2x115V (class-h, upper voltge). Had to repair one of these (got 3 for a good price!). Solder joint failure. There seems to be many chinese amps having the same guts.. Pretty good amp tho, just not quite as powerful as they claim. Soft start circuit (I wish the relay never fails to disconnect!), good clipping behaviour, nice sound quality.. I measured 1300-1400W/8ohm bridged, RMS sine wave @ 40Hz, mains voltage dropped from 230 to 220V which indeed makes things worse. Tried to measure 4ohm bridged, but it blew the 16A mains fuse.
Edited by Tonskulus - 22 March 2019 at 9:00am |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Mosfet amplifier module from ACS active 2x18 subwoofer. Two amps in bridge configuration (16 fets total, 2SJ56 / SK176 pairs). Going to put this thing to a 3U rack enclosure to be used as stereo or bridge mode, very good sounding amp it is! Measured around 1kW rms / 8ohm. Rail voltage +/-95Volts, needs bigger tranny (higher VA rating). Propably more capacitance for filtering, there is 2x10000µF.
One of the driver pcb: Edited by Tonskulus - 22 March 2019 at 9:37am |
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Group2
Registered User Joined: 14 January 2019 Location: Denmark Status: Offline Points: 10 |
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Are you still crown xti expert:)? I have some problems with this model. Maybe you will help.. larslars805@gmal.com |
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Chris Grimshaw
Registered User Joined: 10 September 2018 Location: Sheffield Status: Offline Points: 281 |
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Anyone interested in seeing a Crown MA12000i? Got one here I don't mind opening up. Chris
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Quality sound from Sheffield
www.grimshawaudio.com |
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