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Multi-Way Conventional loudspeakers with crossovers

Alesis monitor one mkii speaker modification.
Alesis monitor one mkii speaker modification.
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Old 20th December 2011, 08:21 AM   #1
vmed_cha_gr is offline vmed_cha_gr  Greece
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Wink Alesis monitor one mkii speaker modification.

One year ago i bought these speakers : Monitor One MKII .
First auditions were good, but they gave me the impression of too much highs & bass with laid back mids.
I opened them and changed the cheap quality bipolar caps of the crossovers with good quality MKP's at the exact same value. ( i used wima mkp10 & vishay mkp1940).
Oh my god !!! They are transformed into a high-end class speakers.
They play even better than my Sonus Faber Concertino's.
And the good thing is that they cost 150euro for a pair + overall built quality is great .
I'm not an Alesis dealer, i just want to share this info with you in case you want to buy cheap speakers & get a transformed set after a small modification !!!
Vassilis
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Old 20th December 2011, 09:27 AM   #2
Inductor is offline Inductor  Portugal
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They should pay you, if they find that.
Look inside for the next series.
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Old 21st December 2011, 07:39 PM   #3
zakman35 is offline zakman35  Mozambique
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This is good Vasili, thanks for sharing.

Have you think upgrading the coils also?
Do you have the circuit diagram of the original crossover?
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Old 22nd December 2011, 04:29 AM   #4
PeteMcK is offline PeteMcK
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schematic here, but the l-pad looks odd....

MINIRIG minor tweak : re-capping the Alesis Monitor One (MK I) studio monitor speakers.
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 22nd December 2011, 06:12 AM   #5
vmed_cha_gr is offline vmed_cha_gr  Greece
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Default i shoul do that !

Hi
I will upgrade the coils too, but i haven't got time to do it yet. So far with the cap tweak they are getting better & better everyday. When i do that i will make a copy of the crossover values & post it here.

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Originally Posted by zakman35 View Post
This is good Vasili, thanks for sharing.

Have you think upgrading the coils also?
Do you have the circuit diagram of the original crossover?
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Old 22nd December 2011, 06:17 AM   #6
vmed_cha_gr is offline vmed_cha_gr  Greece
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Default attention

The speakers you are looking are the previous version.
As i remember the new version ones have 9.2uf , 10uf & 15uf values. But i will check it out again.

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Originally Posted by PeteMcK View Post
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Old 22nd December 2011, 06:29 AM   #7
wrenchone is offline wrenchone  United States
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I have a pair of what I believe are the original Alesis mini-monitors. It sounds like revamping their crossovers would be a good thing. As fr as I'm concerned, getting rid of those consarned bipolar electrolytics is never a bad thing, even if you only upgrade them to polyesters...

Last edited by wrenchone; 22nd December 2011 at 06:32 AM.
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Old 22nd December 2011, 07:01 AM   #8
vmed_cha_gr is offline vmed_cha_gr  Greece
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It's 8.2uf, 10uf & 15uf with low quality bennic bipolar caps for the mkII version.

Quote:
Originally Posted by vmed_cha_gr View Post
The speakers you are looking are the previous version.
As i remember the new version ones have 9.2uf , 10uf & 15uf values. But i will check it out again.
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Old 22nd December 2011, 09:27 AM   #9
qusp is offline qusp  Australia
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I had the active version (the M1 Mk II) for a while and agree its somewhat dry, but that is afterall the point and trademark sound of the monitor one and its the reason to this day you will find a pair of them as a point of reference in just about every major recording studio. good chance the boominess you were experiencing is more to do with the room/placement than anything else
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Old 22nd December 2011, 09:39 AM   #10
vmed_cha_gr is offline vmed_cha_gr  Greece
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Never had a problem with boominess with these speakers. I started the topic because i used them ones for listening to music at my leaving room, they were good (dry as you mention with laid back mids) but after changing the caps they transformed into something else. Now the are permanently connected to my system, never harsh & can play loud without the highs making you ears hurt. A cheap solution if you don't want to pay a fortune for expensive pairs, with just a tweak.
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