Missing some 'highs' using the Alpair CHR-70 gen 3 - diyAudio
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Old 19th August 2013, 03:25 PM   #1
Sprong is offline Sprong  Netherlands
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Default Missing some 'highs' using the Alpair CHR-70 gen 3

I'm using the Alpair CHR-70 in a (very simple) two way setup, and looking for a warm and gentle sound (but also pretty allround).
After listening for a couple of hours the last few days I'm quite satisfied and sometimes pretty impressed too.
However I'm missing a touch of highs for my taste and doubt if this will get noticeably better after the recommended running-in period of 100 hours?!
Could the Alpair 7 gen 3 provide noticable better highs? .. reason I'm asking, the Alpair 7's are quite more expensive.

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Alpair CHR-70 Champagne Gen3
Closed cabinet ~3.7 Liter
Frequency starting from ~300Hz (first order)

Monacor SPH-250KE
Closed cabinet ~100 Liter
Frequency ending at ~600Hz (first order)
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Old 19th August 2013, 03:32 PM   #2
zman01 is offline zman01  Bangladesh
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Sprong,

MA drivers do get better after running in - couple of hours is very little.

Where do you miss the HF? What type of damping do you have in the small cabinet for the CHR-70.3?
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Old 19th August 2013, 03:48 PM   #3
chrisb is offline chrisb  Canada
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Even after extensive careful break-in, these drivers will likely always exhibit some shyness above 10K . It's a delicate balance engineering all the suggestions for "improvements" from customer's feedback, and I think that's what happened with this one.

Perhaps the CHR70s? From my own listening, there's no question the Alpair 7 is superior in all respects, but at certainly a higher price.
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Old 19th August 2013, 04:15 PM   #4
Sprong is offline Sprong  Netherlands
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zman01,

There's not much space for damping in this little enclosure.
Except for the baffle, leadbitumen at all sides and from the back half of the enclosure loosely filled with dr bailey's long hair.
I didn't measured thus don't know from where I'm missing the HF 'exactly'.
I've build a compact set of 'fullrange' speakers in the past using CSS FR125SR drivers, however these needed a tweeter from ~10K upwards.
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Old 19th August 2013, 04:37 PM   #5
Sprong is offline Sprong  Netherlands
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chrisb,

Thanks ... I was a bit 'afraid' for this, the figures promising better using the Alpair 7's however glad to hear you've experienced better results using the Alpairs 7!
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Old 19th August 2013, 07:42 PM   #6
Sprong is offline Sprong  Netherlands
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Looks like no further words needs to be spend for my (beginner) question, I will order a set Alpair 7 gen 3 drivers .. thanks guys!
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Old 20th August 2013, 04:18 AM   #7
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I am very satisfied with my pair of Alpair 7.3s. They have about 500 hours on them maybe more. No lack of detail and hf extension. The only drawback to them is that they lack a little dynamic range when run full range. I plan to use then in a two way "FAST" system crossing as low as I can get away with and still have the dynamic range I need to accurately reproduce classical music in relative near-field.
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Old 20th August 2013, 04:45 PM   #8
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I have never found any trouble with the high notes on my CHR70s. Some people that have listened to them have even found them too bright. My set went deeper as the wore in.

Kyle
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Old 20th August 2013, 05:11 PM   #9
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The current gen. CHR-70.3 gets out to a nominal 30KHz, based on the manufacturer plots. It's about 4dB down at 20KHz (again based on these). So HF output isn't too bad at all. The A7 gets higher & has more top-end output (amongst other things), as you'd expect given that it's a pricier unit.
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Old 21st August 2013, 07:39 AM   #10
Osmo is offline Osmo  Finland
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My chr 70.3 are too bright, I measured almost +15 db spike on 13k. I currently have eq:ed it ,but i am putting a notch filter. On the datasheet the spike didnt look nearly as bad as it is. Mayby there is differences between drivers (both mine measured the same).
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