Power amplifiers
Crown CDi 1000 Review: The 70 Volt Install Amplifier
Quick answer
Buy the CDi 1000 if you are driving a 70 volt distributed ceiling system and want direct 70V outputs with no separate transformer, at about $1,488. Skip it if your system is a pair of 8 ohm mains, because you would be paying install-amplifier prices for capability you cannot use.
The CDi 1000 is the right amplifier for a distributed 70 volt system: ceiling speakers through a building, an overflow room on the same line, a foyer and corridor zone. It is the wrong amplifier for a straightforward pair of passive main loudspeakers, where a Crown XLS delivers comparable power for a third of the price.
This review is drawn from published specifications, manufacturer figures and the consensus of verified owner reviews, not hands-on testing. The 70 volt output is the entire reason this amplifier costs what it costs.
On this page
What direct 70 volt output saves you
A distributed system puts many speakers on one long cable run. Doing that at 8 ohms is impossible past a handful of boxes, so distributed systems use a 70 volt line: each speaker has a small transformer tapped at a chosen wattage, and the amplifier drives the line at high voltage and low current, which keeps cable losses small over long runs.
Most amplifiers need a separate step-up transformer to do this, which is another box, another cost and another failure point. The CDi 1000 drives 70V directly. Work out your tap structure and total load with the 70 volt system calculator, and see the alternatives in the 70 volt amplifier roundup.
Published specifications
The 70V figure and the 4 ohm figure are the same amplifier working two different ways. Only one of them will apply to your system.
The CDi 1000 delivers 500 watts per channel at 4 ohms and 500 watts per channel into a 70V line, in a single rack unit, for about $1,488.
| Specification | Figure |
|---|---|
| Channels | 2 |
| Power per channel at 4 ohms | 500 watts |
| Power per channel at 70V | 500 watts |
| Direct outputs | 70V and 140V |
| Amplifier class | Class D |
| Rack units | 1 |
| Catalog price | $1,487.52 |
Figures are Crown’s published specifications for the CDi series. Nothing here was measured on this site.
The compromise: you pay install prices for install capability
At $1,487.52 the CDi 1000 costs roughly two and a half times what an XLS1502 costs, and delivers comparable power into 4 ohms. If your system is a pair of passive mains, every dollar of that difference buys you nothing, and churches do make this mistake because the CDi is what an installer quoted for the ceiling system and it seemed sensible to use the same amplifier everywhere.
The second part of the compromise is that a 70V system has a hard load limit. The tap wattages of every speaker on the line add up, and that total must stay under about 80 percent of the amplifier rating to leave headroom. Exceed it and the amplifier is overloaded from the first Sunday. That arithmetic has to be done before the speakers are bought, not after.
What owners consistently report
Published owner reviews describe the CDi range as reliable install hardware, with long service lives in commercial and house of worship systems. The direct 70V output is repeatedly cited as the reason for purchase, and the single rack unit height draws praise in racks that are already full.
The consistent criticisms are price and, as with most install amplifiers, fan noise in quiet rooms. Owners also note that the feature set is deliberately sparse compared with the XLS range: this is an amplifier designed to sit in a closet and run a distributed line, not a processing hub, and it should be judged as such.
Alternatives worth considering instead
Step-up alternative, because tap budgets run out: the CDi 2000 at $1,125.00 delivers 800 watts per channel, for a long or dense 70V line or several ancillary rooms sharing one amplifier.
Budget pick, because your system may not be distributed at all: the XLS1502 at $579.99 is the right amplifier for a pair of 8 ohm passive mains, with crossover and limiting included.
Different approach, because processing may be the gap: pairing a cheaper amplifier with a DriveRack PA2 gives room tuning and delay that no amplifier of this class includes.
Who should buy it, and who should not
Buy it if you are installing a 70 volt distributed system: ceiling speakers in a fellowship hall, a corridor and foyer zone, an overflow room, or a paging system across a building. Buy it if you want the amplifier and the line driver to be one box that lives in a closet and is never touched.
Do not buy it for a pair of main loudspeakers in a sanctuary. Decide which system you are actually building by reading 70 volt versus 8 ohm, then follow the 70 volt wiring guide, and have a licensed electrician handle anything in the building fabric.
Sources
- Crown CDi series published specification sheet
- Crown CDi series installation manual, 70V and 140V operation
- Consensus of verified owner reviews published on major retailer listings
Frequently asked questions
When does a church need a 70 volt system?
When you have more than about four speakers on a line, or long cable runs through a building. A 70V line lets many speakers share one amplifier with small cable losses, which is how corridors, foyers, overflow rooms and ceiling systems are wired. A pair of mains on the platform should stay at 8 ohms, where the amplifier can deliver full power directly.
How much 70 volt amplifier power does a church need?
Add up the tap wattage of every speaker on the line and keep that total under about 80 percent of the amplifier rating, which leaves headroom and protects the amplifier. Twenty ceiling speakers tapped at 8 watts each is 160 watts of load, which one channel of a CDi 1000 covers comfortably. The 70 volt system calculator does this arithmetic for you.
CDi 1000 or XLS1502 for a church?
Different tools. The CDi drives a 70 volt distributed line directly and belongs with ceiling speakers; the XLS drives 8 ohm passive mains and includes crossover, limiting and delay. Buying the CDi for a pair of mains means paying install prices for an output you will never connect. Match the amplifier to the wiring topology, not to the budget.
Can one CDi 1000 run both mains and ceiling speakers?
In principle each channel can be configured separately, but mixing a sanctuary main system and a distributed ceiling zone on one amplifier is poor practice: the two zones need different processing, different levels and different reliability expectations. Keep them on separate amplifiers so a fault in one does not silence the other.
What tap setting should ceiling speakers use?
Enough to reach a comfortable level with headroom, and no more, because every watt tapped consumes amplifier capacity for the whole line. Speech in a quiet room often works at a low tap, while a fellowship hall with noise needs more. Our 70 volt tap chart gives typical settings by application and room type.
Researched, not professional advice. This page is compiled from published manufacturer specifications, operator manuals, FCC rules, published standards and owner-review consensus, not hands-on testing. Sound system design, rigging loudspeakers overhead, and any electrical work are jobs for a qualified professional: have flown loudspeakers and their attachment points signed off by a structural engineer or a certified rigger, and have all wiring done by a licensed electrician to your local code. Wireless microphone rules change, so confirm the current FCC position before buying. As an Amazon Associate we earn from qualifying purchases.